diff --git a/Advent_2021/pom.xml b/Advent_2021/pom.xml
index a5e5732..2111081 100644
--- a/Advent_2021/pom.xml
+++ b/Advent_2021/pom.xml
@@ -23,7 +23,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>27.0.1-jre</version>
+            <version>29.0-jre</version>
         </dependency>
         <dependency>
             <groupId>com.google.gwt</groupId>