diff --git a/caseStudies/Jest/Jest-master/pom.xml b/caseStudies/Jest/Jest-master/pom.xml
old mode 100755
new mode 100644
index feb0d0c0..67259df9
--- a/caseStudies/Jest/Jest-master/pom.xml
+++ b/caseStudies/Jest/Jest-master/pom.xml
@@ -76,7 +76,7 @@
         <slf4j.version>1.7.21</slf4j.version>
 
         <guava.version>19.0</guava.version>
-        <gson.version>2.6.2</gson.version>
+        <gson.version>2.8.9</gson.version>
         <mockito.version>1.10.19</mockito.version>
 
         <commonsLang.version>3.4</commonsLang.version>