diff --git a/pom.xml b/pom.xml
index 8ae1cebf..c97fc1c2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,7 +61,7 @@
         <dependency> <!-- use a specific Groovy version rather than the one specified by spock-core -->
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy-all</artifactId>
-            <version>2.5.18</version>
+            <version>2.5.20</version>
             <type>pom</type>
             <scope>test</scope>
             <exclusions>