diff --git a/tool_files/maven_3_3_9/floodgage/pom.xml b/tool_files/maven_3_3_9/floodgage/pom.xml
index 6ade28e0..626e539f 100644
--- a/tool_files/maven_3_3_9/floodgage/pom.xml
+++ b/tool_files/maven_3_3_9/floodgage/pom.xml
@@ -99,7 +99,7 @@
       <dependency>
           <groupId>com.google.guava</groupId>
           <artifactId>guava</artifactId>
-          <version>23.1-jre</version>
+          <version>29.0-jre</version>
       </dependency>
       <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
       <dependency>