diff --git a/code/bank/account/pom.xml b/code/bank/account/pom.xml
old mode 100755
new mode 100644
index f9a4b2b..9162fd0
--- a/code/bank/account/pom.xml
+++ b/code/bank/account/pom.xml
@@ -43,7 +43,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>27.0.1-jre</version>
+            <version>29.0-jre</version>
         </dependency>
         <dependency>
             <groupId>org.json</groupId>