diff --git a/backend/pom.xml b/backend/pom.xml
old mode 100755
new mode 100644
index 2877350ab..e744f5a17
--- a/backend/pom.xml
+++ b/backend/pom.xml
@@ -40,7 +40,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.2.1</version>
+            <version>2.8.9</version>
             <scope>compile</scope>
         </dependency>