diff --git a/pom.xml b/pom.xml
index 304732c..4e27b89 100644
--- a/pom.xml
+++ b/pom.xml
@@ -71,7 +71,7 @@
 
         <jacoco.fileset.directory>target</jacoco.fileset.directory>
         <dependency.spock.version>1.3-groovy-2.4</dependency.spock.version>
-        <groovy.version>2.4.17</groovy.version>
+        <groovy.version>2.4.21</groovy.version>
     </properties>
 
     <dependencyManagement>