diff --git a/opa-evaluator/src/main/java/io/github/open_policy_agent/opa/ast/builtin/impls/UUIDBuiltins.java b/opa-evaluator/src/main/java/io/github/open_policy_agent/opa/ast/builtin/impls/UUIDBuiltins.java
index 7e44e4d8..44c9ab40 100644
--- a/opa-evaluator/src/main/java/io/github/open_policy_agent/opa/ast/builtin/impls/UUIDBuiltins.java
+++ b/opa-evaluator/src/main/java/io/github/open_policy_agent/opa/ast/builtin/impls/UUIDBuiltins.java
@@ -23,6 +23,7 @@ public class UUIDBuiltins {
 
   private static final long UUID_EPOCH_OFFSET_100NS = 122192928000000000L;
   private static final String RFC4122 = "uuid.rfc4122";
+  private static final String URN_PREFIX = "urn:uuid:";
   private static final SecureRandom RANDOM = new SecureRandom();
   private static final Pattern CANONICAL_UUID_PATTERN =
       Pattern.compile(
@@ -137,16 +138,16 @@ private String normalize(String input) {
         value = input;
         break;
       case 38:
-        if (!input.startsWith("{") || !input.endsWith("}")) {
-          return null;
-        }
+        // google/uuid only examines the middle 36 bytes of the "Microsoft style"
+        // form, so the surrounding bytes are not required to be braces.
         value = input.substring(1, input.length() - 1);
         break;
       case 45:
-        if (!input.startsWith("urn:uuid:")) {
+        // google/uuid compares the prefix with strings.EqualFold.
+        if (!input.regionMatches(true, 0, URN_PREFIX, 0, URN_PREFIX.length())) {
           return null;
         }
-        value = input.substring("urn:uuid:".length());
+        value = input.substring(URN_PREFIX.length());
         break;
       default:
         return null;
diff --git a/opa-evaluator/src/test/java/io/github/open_policy_agent/opa/ast/builtin/impls/UUIDBuiltinsTest.java b/opa-evaluator/src/test/java/io/github/open_policy_agent/opa/ast/builtin/impls/UUIDBuiltinsTest.java
index 9106e974..e45acb56 100644
--- a/opa-evaluator/src/test/java/io/github/open_policy_agent/opa/ast/builtin/impls/UUIDBuiltinsTest.java
+++ b/opa-evaluator/src/test/java/io/github/open_policy_agent/opa/ast/builtin/impls/UUIDBuiltinsTest.java
@@ -84,6 +84,44 @@ void parseReturnsUndefinedForInvalidUuid() {
     assertNull(builtins.parse(null, new RegoValue[] {new RegoString("123")}));
   }
 
+  /**
+   * google/uuid compares the urn prefix with {@code strings.EqualFold}, so any casing parses. Not
+   * covered by the upstream uuid fixtures; verified with {@code opa eval} against OPA 1.19.0.
+   */
+  @Test
+  void parsesUrnPrefixCaseInsensitively() {
+    for (String prefix : new String[] {"urn:uuid:", "URN:UUID:", "Urn:Uuid:"}) {
+      RegoObject result =
+          (RegoObject)
+              builtins.parse(
+                  null,
+                  new RegoValue[] {new RegoString(prefix + "000003e8-48b9-21ee-b200-325096b39f47")});
+
+      assertEquals(RegoInt32.of(2), result.getProperty("version"), prefix);
+      assertEquals(new RegoString("RFC4122"), result.getProperty("variant"), prefix);
+      assertEquals(new RegoBigInt(1000L), result.getProperty("id"), prefix);
+    }
+  }
+
+  /**
+   * google/uuid only examines the middle 36 bytes of the 38-byte "Microsoft style" form, so the
+   * surrounding bytes are not required to be braces — {@code opa eval} accepts all of these.
+   */
+  @Test
+  void parsesThirtyEightByteFormWithoutRequiringBraces() {
+    for (String input :
+        new String[] {
+          "{000003e8-48b9-21ee-b200-325096b39f47}",
+          "(000003e8-48b9-21ee-b200-325096b39f47)",
+          "X000003e8-48b9-21ee-b200-325096b39f47Y",
+          "{000003e8-48b9-21ee-b200-325096b39f47X"
+        }) {
+      RegoObject result = (RegoObject) builtins.parse(null, new RegoValue[] {new RegoString(input)});
+
+      assertEquals(RegoInt32.of(2), result.getProperty("version"), input);
+    }
+  }
+
   @Test
   void parseRejectsLenientJavaUuidFieldWidths() {
     assertNull(builtins.parse(null, new RegoValue[] {new RegoString("1-1-1-1-1")}));
diff --git a/opa-evaluator/src/test/resources/compliance/known-missing-builtins.txt b/opa-evaluator/src/test/resources/compliance/known-missing-builtins.txt
index 7979170a..7362d8ca 100644
--- a/opa-evaluator/src/test/resources/compliance/known-missing-builtins.txt
+++ b/opa-evaluator/src/test/resources/compliance/known-missing-builtins.txt
@@ -67,8 +67,5 @@ urlquery.decode_object
 urlquery.encode
 urlquery.encode_object
 
-uuid.parse
-uuid.rfc4122
-
 # Delete this line along with the walk implementation in #141.
 walk