diff --git a/postpone/pom.xml b/postpone/pom.xml
index 6d6d732..b0a5233 100644
--- a/postpone/pom.xml
+++ b/postpone/pom.xml
@@ -118,7 +118,7 @@
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-compress</artifactId>
-            <version>1.20</version>
+            <version>1.21</version>
         </dependency>
         <dependency>
             <groupId>org.tukaani</groupId>