diff --git a/build.gradle b/build.gradle
index 3578f8cf..c3bceebb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -36,7 +36,7 @@ dependencies {
         exclude group: 'org.codehaus.groovy'
     }
     //for "@Rule TemporaryFolder"
-    testImplementation('org.spockframework:spock-junit4:2.3-groovy-3.0') {
+    testImplementation('org.spockframework:spock-junit4:2.3-groovy-4.0') {
         exclude group: 'org.codehaus.groovy'
     }
     testImplementation 'net.bytebuddy:byte-buddy:1.14.8' //for Spying in Spock