diff --git a/jgram/pom.xml b/jgram/pom.xml
index 3bd302b..f4b873e 100644
--- a/jgram/pom.xml
+++ b/jgram/pom.xml
@@ -70,7 +70,7 @@
     <dependency>
     	<groupId>org.apache.commons</groupId>
     	<artifactId>commons-compress</artifactId>
-    	<version>1.20</version>
+    	<version>1.21</version>
     </dependency>
     <dependency>
     	<groupId>com.zaxxer</groupId>