diff --git a/iching-common/pom.xml b/iching-common/pom.xml
index 89a9511..ef60557 100644
--- a/iching-common/pom.xml
+++ b/iching-common/pom.xml
@@ -32,7 +32,7 @@
 		<dependency>
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
-			<version>27.0-jre</version>
+			<version>29.0-jre</version>
 		</dependency>
 		<dependency>
 			<groupId>com.wuwenze</groupId>