diff --git a/build.gradle b/build.gradle
index 28fb5c872..4e9a11b60 100644
--- a/build.gradle
+++ b/build.gradle
@@ -37,10 +37,13 @@ buildscript {
 ext.versions = [
         flink    : "1.14.2",
         hadoop   : "2.7.7",
+        jctoolsVersion : "1.+",
         junit4   : "4.11",
         junit5   : "5.4.+",
         mockito  : "2.0.+",
         mockito3 : "3.+",
+        nettyVersion : "4.1.34.Final",
+        snappyVersion : "1.1.+",
         spectator: "1.3.+",
         slf4j    : "1.7.0",
         vavr     : "0.9.2",
diff --git a/mantis-common/build.gradle b/mantis-common/build.gradle
index 6b8d2e5ef..0389c7d9c 100644
--- a/mantis-common/build.gradle
+++ b/mantis-common/build.gradle
@@ -16,12 +16,6 @@
 
 apply plugin: 'java-test-fixtures'
 
-ext {
-    jctoolsVersion = '1.+'
-    nettyVersion = '4.1.17.Final'
-    snappyVersion = '1.1.+'
-}
-
 dependencies {
     api project(":mantis-common-serde")
     api libraries.nettyCodec