diff --git a/build.gradle.kts b/build.gradle.kts
index 67a98a9b..2dde003a 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -13,8 +13,8 @@ val dependencyVersions = listOf(
   "org.apache.commons:commons-compress:1.26.2",
   "org.codehaus.groovy:groovy:3.0.21",
   "org.codehaus.groovy:groovy-json:3.0.21",
-  "org.apache.groovy:groovy:4.0.20",
-  "org.apache.groovy:groovy-json:4.0.20",
+  "org.apache.groovy:groovy:4.0.21",
+  "org.apache.groovy:groovy-json:4.0.21",
   "org.jetbrains:annotations:24.1.0",
   "org.junit:junit-bom:5.10.2",
 )
diff --git a/client-groovy4/build.gradle.kts b/client-groovy4/build.gradle.kts
index e87b0cdb..5c383d46 100644
--- a/client-groovy4/build.gradle.kts
+++ b/client-groovy4/build.gradle.kts
@@ -103,8 +103,8 @@ dependencies {
   api("de.gesellix:docker-engine:2024-03-13T22-25-00")
   api("de.gesellix:docker-compose:2024-06-09T22-20-00")
 
-  implementation("org.apache.groovy:groovy:4.0.20")
-  implementation("org.apache.groovy:groovy-json:4.0.20")
+  implementation("org.apache.groovy:groovy:4.0.21")
+  implementation("org.apache.groovy:groovy-json:4.0.21")
 
   api("com.squareup.moshi:moshi:1.15.1")
   implementation("com.google.re2j:re2j:1.7")
diff --git a/explore/build.gradle.kts b/explore/build.gradle.kts
index 089f8e48..b4472849 100644
--- a/explore/build.gradle.kts
+++ b/explore/build.gradle.kts
@@ -63,7 +63,7 @@ dependencies {
 //  implementation(project(":client"))
   implementation(project(":client-groovy4"))
 //  implementation("org.codehaus.groovy:groovy:[3,4)")
-  implementation("org.apache.groovy:groovy:4.0.20")
+  implementation("org.apache.groovy:groovy:4.0.21")
   testImplementation("org.apache.commons:commons-compress:1.26.2")
 
   implementation("org.slf4j:slf4j-api:2.0.12")