diff --git a/toolbelt-groovy/build.gradle b/toolbelt-groovy/build.gradle
index 8cac1b0..3ee82a9 100644
--- a/toolbelt-groovy/build.gradle
+++ b/toolbelt-groovy/build.gradle
@@ -8,6 +8,6 @@ repositories {
 
 dependencies {
 
-    api 'org.codehaus.groovy:groovy-all:2.5.16'
+    api 'org.codehaus.groovy:groovy-all:3.0.10'
     api project(":toolbelt")
 }
diff --git a/toolbelt/build.gradle b/toolbelt/build.gradle
index 385b356..d22de35 100644
--- a/toolbelt/build.gradle
+++ b/toolbelt/build.gradle
@@ -8,6 +8,6 @@ repositories {
 }
 
 dependencies {
-    testImplementation "org.codehaus.groovy:groovy-all:2.5.16"
+    testImplementation "org.codehaus.groovy:groovy-all:3.0.10"
     testImplementation "org.spockframework:spock-core:2.1-groovy-3.0"
 }