diff --git a/refactoring/pom.xml b/refactoring/pom.xml
index 2919c76..b1c9222 100644
--- a/refactoring/pom.xml
+++ b/refactoring/pom.xml
@@ -123,7 +123,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>26.0-jre</version>
+            <version>29.0-jre</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>