diff --git a/pom.xml b/pom.xml
index 60b7160..a416417 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,11 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>4.0.4</version>
+        <version>4.0.7</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
@@ -16,8 +17,8 @@
 
     <properties>
         <java.version>25</java.version>
-        <errorprone.version>2.48.0</errorprone.version>
-        <nullaway.version>0.13.1</nullaway.version>
+        <errorprone.version>2.50.0</errorprone.version>
+        <nullaway.version>0.13.7</nullaway.version>
     </properties>
 
     <dependencyManagement>
@@ -25,7 +26,7 @@
             <dependency>
                 <groupId>it.aboutbits</groupId>
                 <artifactId>spring-boot-toolbox</artifactId>
-                <version>2.4.4</version>
+                <version>2.5.2</version>
             </dependency>
             <dependency>
                 <groupId>it.aboutbits</groupId>
@@ -59,6 +60,13 @@
             <optional>true</optional>
         </dependency>
 
+        <!-- Source: https://mvnrepository.com/artifact/com.google.errorprone/error_prone_annotations -->
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>error_prone_annotations</artifactId>
+            <version>${errorprone.version}</version>
+        </dependency>
+
         <!-- Testing -->
         <dependency>
             <groupId>org.springframework.security</groupId>
diff --git a/src/main/java/it/aboutbits/springboot/testing/persistence/PersistenceAssert.java b/src/main/java/it/aboutbits/springboot/testing/persistence/PersistenceAssert.java
index 3194297..92c77da 100644
--- a/src/main/java/it/aboutbits/springboot/testing/persistence/PersistenceAssert.java
+++ b/src/main/java/it/aboutbits/springboot/testing/persistence/PersistenceAssert.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.persistence;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.spring.BeanAccessor;
 import it.aboutbits.springboot.toolbox.persistence.ChangeAware;
 import it.aboutbits.springboot.toolbox.type.identity.EntityId;
@@ -28,6 +29,7 @@ private static EntityManager getEntityManager() {
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public static <ID extends EntityId<?>, E extends Identified<ID> & ChangeAware, M extends Identified<ID> & ChangeAware> WriteOperationAsserter<ID, E, M> assertThatEntity(
             E before,
             Class<M> modelClass
@@ -36,6 +38,7 @@ public static <ID extends EntityId<?>, E extends Identified<ID> & ChangeAware, M
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public static <ID extends EntityId<?>, E extends Identified<ID> & ChangeAware, M extends Identified<ID> & ChangeAware> WriteOperationAsserter<ID, E, M> assertThatEntity(
             Collection<E> before,
             Class<M> modelClass
@@ -44,6 +47,7 @@ public static <ID extends EntityId<?>, E extends Identified<ID> & ChangeAware, M
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public static <ID extends EntityId<?>, M extends Identified<ID>> WriteOperationIdAsserter<ID, M> assertThatEntityId(
             ID id,
             Class<M> modelClass
@@ -52,6 +56,7 @@ public static <ID extends EntityId<?>, M extends Identified<ID>> WriteOperationI
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public static <ID extends EntityId<?>, M extends Identified<ID>> WriteOperationIdAsserter<ID, M> assertThatEntityId(
             Collection<ID> id,
             Class<M> modelClass
diff --git a/src/main/java/it/aboutbits/springboot/testing/testdata/base/AllTestDataReader.java b/src/main/java/it/aboutbits/springboot/testing/testdata/base/AllTestDataReader.java
index 648391d..d2220bc 100644
--- a/src/main/java/it/aboutbits/springboot/testing/testdata/base/AllTestDataReader.java
+++ b/src/main/java/it/aboutbits/springboot/testing/testdata/base/AllTestDataReader.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.testdata.base;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import org.jspecify.annotations.NullMarked;
 
 import java.util.Comparator;
@@ -24,6 +25,7 @@ public List<ITEM> returnAll() {
 
     @SafeVarargs
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public final List<ITEM> returnSorted(Comparator<ITEM>... comparators) {
         if (comparators.length == 0) {
             throw new IllegalArgumentException("At least one comparator must be provided");
@@ -39,6 +41,7 @@ public final List<ITEM> returnSorted(Comparator<ITEM>... comparators) {
 
     @SafeVarargs
     @SuppressWarnings({"unchecked", "unused"})
+    @CheckReturnValue
     public final <U extends Comparable<? super U>> List<ITEM> returnSorted(Function<ITEM, ? extends Comparable<?>>... comparators) {
         if (comparators.length == 0) {
             throw new IllegalArgumentException("At least one comparator must be provided");
@@ -53,6 +56,7 @@ public final <U extends Comparable<? super U>> List<ITEM> returnSorted(Function<
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public <U extends Comparable<? super U>> AllAndFiltered<ITEM> returnFiltered(Predicate<ITEM> predicate) {
         var all = this.returnAll();
         return new AllAndFiltered<>(
@@ -63,6 +67,7 @@ public <U extends Comparable<? super U>> AllAndFiltered<ITEM> returnFiltered(Pre
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public Set<ITEM> returnSet() {
         return new HashSet<>(this.returnAll());
     }
diff --git a/src/main/java/it/aboutbits/springboot/testing/testdata/base/ModifiableTestDataCreator.java b/src/main/java/it/aboutbits/springboot/testing/testdata/base/ModifiableTestDataCreator.java
index 732004b..955e9c9 100644
--- a/src/main/java/it/aboutbits/springboot/testing/testdata/base/ModifiableTestDataCreator.java
+++ b/src/main/java/it/aboutbits/springboot/testing/testdata/base/ModifiableTestDataCreator.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.testdata.base;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import lombok.extern.slf4j.Slf4j;
 import org.jspecify.annotations.NullMarked;
 import org.jspecify.annotations.Nullable;
@@ -31,6 +32,7 @@ protected ModifiableTestDataCreator(int count) {
     }
 
     @SuppressWarnings({"unchecked", "unused"})
+    @CheckReturnValue
     public CREATOR modifyParameter(BiFunction<PARAMETER, Integer, PARAMETER> parameterMutator) {
         this.parameterMutator = (parameter, index) -> {
             mutatorCalled = true;
@@ -41,6 +43,7 @@ public CREATOR modifyParameter(BiFunction<PARAMETER, Integer, PARAMETER> paramet
     }
 
     @SuppressWarnings({"unchecked", "unused"})
+    @CheckReturnValue
     public CREATOR modifyParameter(UnaryOperator<PARAMETER> parameterMutator) {
         this.parameterMutator = (parameter, index) -> {
             mutatorCalled = true;
@@ -51,12 +54,14 @@ public CREATOR modifyParameter(UnaryOperator<PARAMETER> parameterMutator) {
     }
 
     @SuppressWarnings({"unchecked", "unused"})
+    @CheckReturnValue
     public CREATOR modifyResult(ObjIntConsumer<ITEM> resultMutator) {
         this.resultMutator = resultMutator;
         return (CREATOR) this;
     }
 
     @SuppressWarnings({"unchecked", "unused"})
+    @CheckReturnValue
     public CREATOR modifyResult(Consumer<ITEM> resultMutator) {
         this.resultMutator = (item, index) -> resultMutator.accept(item);
         return (CREATOR) this;
diff --git a/src/main/java/it/aboutbits/springboot/testing/testdata/base/TestDataCreator.java b/src/main/java/it/aboutbits/springboot/testing/testdata/base/TestDataCreator.java
index 96287dd..6147b34 100644
--- a/src/main/java/it/aboutbits/springboot/testing/testdata/base/TestDataCreator.java
+++ b/src/main/java/it/aboutbits/springboot/testing/testdata/base/TestDataCreator.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.testdata.base;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.testdata.FakerExtended;
 import org.jspecify.annotations.NullMarked;
 
@@ -28,17 +29,20 @@ public void commit() {
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public ITEM returnFirst() {
         return create().getFirst();
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public List<ITEM> returnAll() {
         return create();
     }
 
     @SafeVarargs
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public final List<ITEM> returnSorted(Comparator<ITEM>... comparators) {
         if (comparators.length == 0) {
             throw new IllegalArgumentException("At least one comparator must be provided");
@@ -54,6 +58,7 @@ public final List<ITEM> returnSorted(Comparator<ITEM>... comparators) {
 
     @SafeVarargs
     @SuppressWarnings({"unchecked", "unused"})
+    @CheckReturnValue
     public final <U extends Comparable<? super U>> List<ITEM> returnSorted(Function<ITEM, ? extends Comparable<?>>... comparators) {
         if (comparators.length == 0) {
             throw new IllegalArgumentException("At least one comparator must be provided");
@@ -68,6 +73,7 @@ public final <U extends Comparable<? super U>> List<ITEM> returnSorted(Function<
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public Set<ITEM> returnSet() {
         return new HashSet<>(create());
     }
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/core/BaseValidationAssert.java b/src/main/java/it/aboutbits/springboot/testing/validation/core/BaseValidationAssert.java
index c81ccae..b24aeae 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/core/BaseValidationAssert.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/core/BaseValidationAssert.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.core;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.toolbox.type.CustomType;
 import jakarta.validation.Valid;
 import lombok.AccessLevel;
@@ -49,6 +50,7 @@ public static void registerNonBeanType(Class<?> type) {
         NON_BEAN_TYPES.add(type);
     }
 
+    @CheckReturnValue
     public <P> CallBuilder<R, P> of(P parameterUnderTest) {
         this.parameterUnderTest = parameterUnderTest;
         ruleBuilder.setTriggerValidation(this::assertValidation);
@@ -56,6 +58,7 @@ public <P> CallBuilder<R, P> of(P parameterUnderTest) {
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public AnnotationChecker calling(
             Class<?> classUnderTest,
             String methodName,
@@ -97,17 +100,20 @@ public static final class CallBuilder<R extends BaseRuleBuilder<?>, P> {
         private final BaseValidationAssert<R> parent;
 
         @SuppressWarnings("unused")
+        @CheckReturnValue
         public R calling(Consumer<P> functionToCallWithParameter) {
             parent.setFunctionToCallWithParameter(functionToCallWithParameter);
             return parent.ruleBuilder;
         }
 
         @SuppressWarnings("unused")
+        @CheckReturnValue
         public R usingBeanValidation() {
             return parent.ruleBuilder;
         }
 
         @SuppressWarnings({"unused", "unchecked"})
+        @CheckReturnValue
         public <ID> R calling(
                 BiConsumer<ID, P> functionToCallWithParameter,
                 ID id
@@ -119,6 +125,7 @@ public <ID> R calling(
         }
 
         @SuppressWarnings({"unused", "unchecked"})
+        @CheckReturnValue
         public <A, B> R calling(
                 TriConsumer<A, B, P> functionToCallWithParameter,
                 A a,
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/BetweenRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/BetweenRule.java
index ce16810..3e176c8 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/BetweenRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/BetweenRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -10,6 +11,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface BetweenRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V between(String property, long min, long max) {
         addRule(
                 new Rule(property, BiggerThanValueSource.class, max)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/FutureRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/FutureRule.java
index aef2e22..b81e6aa 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/FutureRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/FutureRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -9,6 +10,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface FutureRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V future(String property) {
         addRule(
                 new Rule(property, PastValueSource.class)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/MaxRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/MaxRule.java
index 1ffae34..8dbb09e 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/MaxRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/MaxRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -9,6 +10,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface MaxRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V max(String property, long max) {
         addRule(
                 new Rule(property, BiggerThanValueSource.class, max)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/MinRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/MinRule.java
index 57f0a33..be5c09a 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/MinRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/MinRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -9,6 +10,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface MinRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V min(String property, long min) {
         addRule(
                 new Rule(property, LessThanValueSource.class, min)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NegativeOrZeroRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NegativeOrZeroRule.java
index e1af433..905334b 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NegativeOrZeroRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NegativeOrZeroRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -9,6 +10,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface NegativeOrZeroRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V negativeOrZero(String property) {
         addRule(
                 new Rule(property, BiggerThanValueSource.class, 0L)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NegativeRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NegativeRule.java
index 888834f..0b208fb 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NegativeRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NegativeRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -10,6 +11,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface NegativeRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V negative(String property) {
         addRule(
                 new Rule(property, BiggerThanValueSource.class, 0L)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotBlankRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotBlankRule.java
index 6d020c6..ae0b3f9 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotBlankRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotBlankRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -10,6 +11,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface NotBlankRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V notBlank(String property) {
         addRule(
                 new Rule(property, BlankValueSource.class)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotEmptyRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotEmptyRule.java
index 612a704..4d08a71 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotEmptyRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotEmptyRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -10,6 +11,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface NotEmptyRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V notEmpty(String property) {
         addRule(
                 new Rule(property, EmptyValueSource.class)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotNullRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotNullRule.java
index d78b1df..61c1452 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotNullRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotNullRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -9,6 +10,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface NotNullRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V notNull(String property) {
         addRule(
                 new Rule(property, NullValueSource.class)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotValidatedRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotValidatedRule.java
index 45fb5d5..b4ce273 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotValidatedRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NotValidatedRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -9,6 +10,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface NotValidatedRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V notValidated(String property) {
         addRule(
                 new Rule(property, InertValueSource.class)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NullableRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NullableRule.java
index 776db9e..703a811 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/NullableRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/NullableRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -8,6 +9,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface NullableRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V nullable(String property) {
         addRule(
                 Rule.nullableAnnotated(property)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/PastRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/PastRule.java
index a0c965d..a264cca 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/PastRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/PastRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -9,6 +10,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface PastRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V past(String property) {
         addRule(
                 new Rule(property, FutureValueSource.class)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/PositiveOrZeroRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/PositiveOrZeroRule.java
index f590a7a..c81336d 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/PositiveOrZeroRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/PositiveOrZeroRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -9,6 +10,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface PositiveOrZeroRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V positiveOrZero(String property) {
         addRule(
                 new Rule(property, LessThanValueSource.class, 0L)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/PositiveRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/PositiveRule.java
index abca7e6..383dfa1 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/PositiveRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/PositiveRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -10,6 +11,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface PositiveRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V positive(String property) {
         addRule(
                 new Rule(property, LessThanValueSource.class, 0L)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/RepeatedFieldRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/RepeatedFieldRule.java
index a2a069b..6381bd1 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/RepeatedFieldRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/RepeatedFieldRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.CustomValidationFunction;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -11,6 +12,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface RepeatedFieldRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V repeatedField(String originalField, String repeatedField) {
         addValidationFunction(
                 (Object o) -> {
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/SizeRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/SizeRule.java
index 4fc5a11..449865b 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/SizeRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/SizeRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -12,6 +13,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface SizeRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default Builder<V> size(String property) {
         return new Builder<>((V) this, property);
     }
@@ -21,6 +23,7 @@ final class Builder<V extends BaseRuleBuilder<?>> {
         private final V parent;
         private final String property;
 
+        @CheckReturnValue
         public V min(long minSize) {
             parent.addRule(
                     new Rule(property, SizeLessThanValueSource.class, minSize)
@@ -28,6 +31,7 @@ public V min(long minSize) {
             return parent;
         }
 
+        @CheckReturnValue
         public V max(long maxSize) {
             parent.addRule(
                     new Rule(property, SizeGreaterThanValueSource.class, maxSize)
@@ -35,6 +39,7 @@ public V max(long maxSize) {
             return parent;
         }
 
+        @CheckReturnValue
         public V minMax(long minSize, long maxSize) {
             parent.addRule(
                     new Rule(property, SizeLessThanValueSource.class, minSize)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidBeanRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidBeanRule.java
index a832898..d67699b 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidBeanRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidBeanRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -8,6 +9,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface ValidBeanRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V validBean(String property) {
         addRule(
                 Rule.validAnnotated(property)
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidDateRangeRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidDateRangeRule.java
index b26baf1..b0cdd20 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidDateRangeRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidDateRangeRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.CustomValidationFunction;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -11,6 +12,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface ValidDateRangeRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V validDateRange(String fromDateField, String toDateField) {
         addValidationFunction(
                 (Object o) -> {
@@ -44,6 +46,7 @@ default V validDateRange(String fromDateField, String toDateField) {
         return (V) this;
     }
 
+    @CheckReturnValue
     default V validDateRange(
             String fromDateField,
             String toDateField,
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidNumericRangeRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidNumericRangeRule.java
index 9ed5a52..1a198ad 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidNumericRangeRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidNumericRangeRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.CustomValidationFunction;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -11,6 +12,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface ValidNumericRangeRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V validNumericRange(String lowerBoundField, String upperBoundField) {
         addValidationFunction(
                 (Object o) -> {
@@ -44,6 +46,7 @@ default V validNumericRange(String lowerBoundField, String upperBoundField) {
         return (V) this;
     }
 
+    @CheckReturnValue
     default V validNumericRange(
             String lowerBoundField,
             String upperBoundField,
diff --git a/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidPasswordRule.java b/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidPasswordRule.java
index aad78c7..69d539a 100644
--- a/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidPasswordRule.java
+++ b/src/main/java/it/aboutbits/springboot/testing/validation/rule/ValidPasswordRule.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.validation.rule;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.testing.validation.core.BaseRuleBuilder;
 import it.aboutbits.springboot.testing.validation.core.Rule;
 import it.aboutbits.springboot.testing.validation.core.ValidationRulesData;
@@ -10,6 +11,7 @@
 @SuppressWarnings("unchecked")
 @NullMarked
 public interface ValidPasswordRule<V extends BaseRuleBuilder<?>> extends ValidationRulesData {
+    @CheckReturnValue
     default V validPassword(String property, long minLength, long maxLength) {
         addRule(
                 new Rule(property, LongerThanValueSource.class, maxLength)
diff --git a/src/main/java/it/aboutbits/springboot/testing/web/request/HttpTestClient.java b/src/main/java/it/aboutbits/springboot/testing/web/request/HttpTestClient.java
index a005c96..fe858be 100644
--- a/src/main/java/it/aboutbits/springboot/testing/web/request/HttpTestClient.java
+++ b/src/main/java/it/aboutbits/springboot/testing/web/request/HttpTestClient.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.web.request;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import lombok.RequiredArgsConstructor;
 import org.jspecify.annotations.NullMarked;
 import org.springframework.test.web.servlet.MockMvc;
@@ -12,34 +13,42 @@ public class HttpTestClient {
     private final MockMvc mockMvc;
     private final JsonMapper jsonMapper;
 
+    @CheckReturnValue
     public Request<MockHttpServletRequestBuilder> get(String url, Object... pathVariables) {
         return new Get(mockMvc, jsonMapper, url, pathVariables);
     }
 
+    @CheckReturnValue
     public Request<MockHttpServletRequestBuilder> put(String url, Object... pathVariables) {
         return new Put(mockMvc, jsonMapper, url, pathVariables);
     }
 
+    @CheckReturnValue
     public MultipartRequest putMultipart(String url, Object... pathVariables) {
         return new PutMultipart(mockMvc, jsonMapper, url, pathVariables);
     }
 
+    @CheckReturnValue
     public Request<MockHttpServletRequestBuilder> post(String url, Object... pathVariables) {
         return new Post(mockMvc, jsonMapper, url, pathVariables);
     }
 
+    @CheckReturnValue
     public MultipartRequest postMultipart(String url, Object... pathVariables) {
         return new PostMultipart(mockMvc, jsonMapper, url, pathVariables);
     }
 
+    @CheckReturnValue
     public Request<MockHttpServletRequestBuilder> patch(String url, Object... pathVariables) {
         return new Patch(mockMvc, jsonMapper, url, pathVariables);
     }
 
+    @CheckReturnValue
     public MultipartRequest patchMultipart(String url, Object... pathVariables) {
         return new PatchMultipart(mockMvc, jsonMapper, url, pathVariables);
     }
 
+    @CheckReturnValue
     public Request<MockHttpServletRequestBuilder> delete(String url, Object... pathVariables) {
         return new Delete(mockMvc, jsonMapper, url, pathVariables);
     }
diff --git a/src/main/java/it/aboutbits/springboot/testing/web/request/MultipartRequest.java b/src/main/java/it/aboutbits/springboot/testing/web/request/MultipartRequest.java
index 76ac6af..50d4155 100644
--- a/src/main/java/it/aboutbits/springboot/testing/web/request/MultipartRequest.java
+++ b/src/main/java/it/aboutbits/springboot/testing/web/request/MultipartRequest.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.web.request;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import org.jspecify.annotations.NullMarked;
 import org.springframework.mock.web.MockMultipartFile;
 import org.springframework.mock.web.MockPart;
@@ -27,12 +28,14 @@ public abstract class MultipartRequest extends Request<MockMultipartHttpServletR
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public MultipartRequest part(MockPart part) {
         parts.add(part);
         return this;
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public MultipartRequest file(MockMultipartFile file) {
         files.add(file);
         return this;
diff --git a/src/main/java/it/aboutbits/springboot/testing/web/request/Request.java b/src/main/java/it/aboutbits/springboot/testing/web/request/Request.java
index c5e60e4..88a5b86 100644
--- a/src/main/java/it/aboutbits/springboot/testing/web/request/Request.java
+++ b/src/main/java/it/aboutbits/springboot/testing/web/request/Request.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.web.request;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import it.aboutbits.springboot.toolbox.web.response.ErrorResponse;
 import it.aboutbits.springboot.toolbox.web.response.ItemResponse;
 import it.aboutbits.springboot.toolbox.web.response.ItemResponseWithMeta;
@@ -68,12 +69,14 @@ protected record UrlWithVariables(String url, Object... pathVariables) {
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public Request<R> cookies(Cookie... cookies) {
         this.cookies = cookies;
         return this;
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public Request<R> body(Object body) {
         if (body instanceof String stringBody) {
             this.body = stringBody;
@@ -90,12 +93,14 @@ public Request<R> body(Object body) {
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public Request<R> param(String name, @Nullable Object value) {
         this.parameters.put(name, String.valueOf(value));
         return this;
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public Request<R> param(String name, Collection<?> values) {
         this.parametersArray.put(
                 name,
@@ -107,12 +112,14 @@ public Request<R> param(String name, Collection<?> values) {
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public Request<R> expectStatus(HttpStatus status) {
         this.status = status;
         return this;
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public Request<R> basicAuth(String username, String password) {
         this.basicAuth = new UsernameAndPassword(username, password);
         return this;
@@ -120,6 +127,7 @@ public Request<R> basicAuth(String username, String password) {
 
     @SneakyThrows(UnsupportedEncodingException.class)
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public <T> ItemResponse<T> returnItem(Class<T> clazz) {
         var res = _execute();
 
@@ -138,6 +146,7 @@ public <T> ItemResponse<T> returnItem(Class<T> clazz) {
 
     @SneakyThrows(UnsupportedEncodingException.class)
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public <T, M extends Meta> ItemResponseWithMeta<T, M> returnItem(
             Class<T> clazz,
             Class<M> metaClass
@@ -159,6 +168,7 @@ public <T, M extends Meta> ItemResponseWithMeta<T, M> returnItem(
 
     @SneakyThrows(UnsupportedEncodingException.class)
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public <T> ListResponse<T> returnList(Class<T> clazz) {
         var res = _execute();
 
@@ -177,6 +187,7 @@ public <T> ListResponse<T> returnList(Class<T> clazz) {
 
     @SneakyThrows(UnsupportedEncodingException.class)
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public <T> PagedResponse<T> returnPage(Class<T> clazz) {
         var res = _execute();
 
@@ -195,6 +206,7 @@ public <T> PagedResponse<T> returnPage(Class<T> clazz) {
 
     @SneakyThrows(UnsupportedEncodingException.class)
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public <T> T returnCustom(Class<T> clazz) {
         var res = _execute();
 
@@ -210,6 +222,7 @@ public <T> T returnCustom(Class<T> clazz) {
 
     @SneakyThrows(UnsupportedEncodingException.class)
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public ErrorResponse returnError() {
         var res = _execute();
 
@@ -224,6 +237,7 @@ public ErrorResponse returnError() {
     }
 
     @SuppressWarnings("unused")
+    @CheckReturnValue
     public ResultActions returnRaw() {
         return _execute();
     }
diff --git a/src/main/java/it/aboutbits/springboot/testing/web/request/RequestSecurityAssert.java b/src/main/java/it/aboutbits/springboot/testing/web/request/RequestSecurityAssert.java
index 3b84012..052aedd 100644
--- a/src/main/java/it/aboutbits/springboot/testing/web/request/RequestSecurityAssert.java
+++ b/src/main/java/it/aboutbits/springboot/testing/web/request/RequestSecurityAssert.java
@@ -1,5 +1,6 @@
 package it.aboutbits.springboot.testing.web.request;
 
+import com.google.errorprone.annotations.CheckReturnValue;
 import org.assertj.core.api.AbstractAssert;
 import org.jspecify.annotations.NullMarked;
 import org.springframework.http.HttpStatus;
@@ -13,6 +14,7 @@ public final class RequestSecurityAssert extends AbstractAssert<RequestSecurityA
         super(actual, RequestSecurityAssert.class);
     }
 
+    @CheckReturnValue
     public static RequestSecurityAssert assertThatRequest(ResultActions actual) {
         return new RequestSecurityAssert(actual);
     }