diff --git a/ocpp-v1_6-test/pom.xml b/ocpp-v1_6-test/pom.xml
index 4b646e41..02fc67c1 100644
--- a/ocpp-v1_6-test/pom.xml
+++ b/ocpp-v1_6-test/pom.xml
@@ -65,7 +65,7 @@
         <dependency>
             <groupId>org.spockframework</groupId>
             <artifactId>spock-core</artifactId>
-            <version>1.0-groovy-2.4</version>
+            <version>2.3-groovy-4.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>
diff --git a/ocpp-v2-test/pom.xml b/ocpp-v2-test/pom.xml
index f325067e..235a1c40 100644
--- a/ocpp-v2-test/pom.xml
+++ b/ocpp-v2-test/pom.xml
@@ -91,7 +91,7 @@
         <dependency>
             <groupId>org.spockframework</groupId>
             <artifactId>spock-core</artifactId>
-            <version>1.0-groovy-2.4</version>
+            <version>2.3-groovy-4.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>
diff --git a/ocpp-v2_0-test/pom.xml b/ocpp-v2_0-test/pom.xml
index e48fa1fb..d7c047f2 100644
--- a/ocpp-v2_0-test/pom.xml
+++ b/ocpp-v2_0-test/pom.xml
@@ -66,7 +66,7 @@
         <dependency>
             <groupId>org.spockframework</groupId>
             <artifactId>spock-core</artifactId>
-            <version>1.0-groovy-2.4</version>
+            <version>2.3-groovy-4.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>