diff --git a/browserup-proxy-core/build.gradle b/browserup-proxy-core/build.gradle
index e1d16988f..eef83eba1 100644
--- a/browserup-proxy-core/build.gradle
+++ b/browserup-proxy-core/build.gradle
@@ -79,7 +79,7 @@ dependencies {
     implementation 'xyz.rogfam:littleproxy:2.0.0-beta-3'
 
     testImplementation 'junit:junit:4.12'
-    testImplementation 'org.codehaus.groovy:groovy-all:2.4.16'
+    testImplementation 'org.codehaus.groovy:groovy-all:2.5.6'
     testImplementation 'org.apache.logging.log4j:log4j-api:2.8'
     testImplementation 'org.apache.logging.log4j:log4j-core:2.8'
     testImplementation 'org.apache.logging.log4j:log4j-slf4j-impl:2.8'
diff --git a/browserup-proxy-mitm/build.gradle b/browserup-proxy-mitm/build.gradle
index 0aaa718bd..2c3d01a9d 100644
--- a/browserup-proxy-mitm/build.gradle
+++ b/browserup-proxy-mitm/build.gradle
@@ -77,7 +77,7 @@ dependencies {
     testImplementation 'org.apache.logging.log4j:log4j-api:2.8'
     testImplementation 'org.apache.logging.log4j:log4j-core:2.8'
     testImplementation 'org.apache.logging.log4j:log4j-slf4j-impl:2.8'
-    testImplementation 'org.codehaus.groovy:groovy-all:2.4.16'
+    testImplementation 'org.codehaus.groovy:groovy-all:2.5.6'
     testImplementation 'org.hamcrest:hamcrest:2.1'
     testImplementation 'org.hamcrest:hamcrest-library:2.1'
     testImplementation 'org.mockito:mockito-core:2.23.4'
diff --git a/browserup-proxy-rest/build.gradle b/browserup-proxy-rest/build.gradle
index 2a3f727ca..dcbbbd016 100644
--- a/browserup-proxy-rest/build.gradle
+++ b/browserup-proxy-rest/build.gradle
@@ -77,7 +77,7 @@ dependencies {
     testImplementation 'org.apache.logging.log4j:log4j-api:2.8.2'
     testImplementation 'org.apache.logging.log4j:log4j-core:2.8.2'
     testImplementation 'org.apache.logging.log4j:log4j-slf4j-impl:2.8.2'
-    testImplementation 'org.codehaus.groovy:groovy-all:2.4.16'
+    testImplementation 'org.codehaus.groovy:groovy-all:2.5.6'
     testImplementation 'org.codehaus.groovy.modules.http-builder:http-builder:0.7.1'
     testImplementation 'org.hamcrest:hamcrest:2.1'
     testImplementation 'org.hamcrest:hamcrest-library:2.1'