diff --git a/chapter18-esb/pom.xml b/chapter18-esb/pom.xml
index d1f960c..5f780e6 100644
--- a/chapter18-esb/pom.xml
+++ b/chapter18-esb/pom.xml
@@ -126,7 +126,7 @@
         <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy</artifactId>
-            <version>1.7.5</version>
+            <version>2.4.21</version>
         </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>