diff --git a/pom.xml b/pom.xml
index 93e61eb..2ad48d8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -16,7 +16,7 @@
     <maven.compiler.source>1.7</maven.compiler.source>
     <maven.compiler.target>1.7</maven.compiler.target>
     <spock.version>1.0-groovy-2.4</spock.version>
-    <groovy.version>2.4.7</groovy.version>
+    <groovy.version>2.4.21</groovy.version>
     <java.version>1.8</java.version>
     <spark.version>2.8.0</spark.version>
     <gson.version>2.8.9</gson.version>