diff --git a/build.gradle b/build.gradle
index 4deb0d1..681b3f7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,8 +9,7 @@ group = 'nu.studer'
 version = '3.0.3-DEV'
 
 dependencies {
-    testImplementation 'org.spockframework:spock-core:2.0-M4-groovy-2.5'
-    testImplementation 'org.spockframework:spock-junit4:2.0-M4-groovy-2.5'
+    testImplementation 'org.spockframework:spock-core:2.0-groovy-2.5'
 }
 
 java {
diff --git a/src/test/groovy/nu/studer/gradle/rocker/BaseFuncTest.groovy b/src/test/groovy/nu/studer/gradle/rocker/BaseFuncTest.groovy
index 3db2d0e..e7a7577 100644
--- a/src/test/groovy/nu/studer/gradle/rocker/BaseFuncTest.groovy
+++ b/src/test/groovy/nu/studer/gradle/rocker/BaseFuncTest.groovy
@@ -3,10 +3,9 @@ package nu.studer.gradle.rocker
 import org.gradle.testkit.runner.BuildResult
 import org.gradle.testkit.runner.GradleRunner
 import org.gradle.util.GradleVersion
-import org.junit.Rule
-import org.junit.rules.TemporaryFolder
 import spock.lang.Shared
 import spock.lang.Specification
+import spock.lang.TempDir
 
 import java.lang.management.ManagementFactory
 
@@ -24,15 +23,15 @@ abstract class BaseFuncTest extends Specification {
         }
     }
 
-    @Rule
-    TemporaryFolder tempDir = new TemporaryFolder()
+    @TempDir
+    File tempDir
 
     File workspaceDir
     GradleVersion gradleVersion
 
     void setup() {
         def testFolder = specificationContext.currentIteration.name.replace(':', '.').replace('\'', '')
-        workspaceDir = new File(tempDir.root, testFolder)
+        workspaceDir = new File(tempDir, testFolder)
         gradleVersion = determineGradleVersion()
 
         def localBuildCacheDirectory = new File(workspaceDir, 'local-cache')
diff --git a/src/test/groovy/nu/studer/gradle/rocker/RockerFuncTest.groovy b/src/test/groovy/nu/studer/gradle/rocker/RockerFuncTest.groovy
index e65e226..8300bb4 100644
--- a/src/test/groovy/nu/studer/gradle/rocker/RockerFuncTest.groovy
+++ b/src/test/groovy/nu/studer/gradle/rocker/RockerFuncTest.groovy
@@ -60,7 +60,7 @@ rocker {
 
     void "can invoke rocker task derived from all-default configuration DSL with Gradle configuration cache enabled"() {
         given:
-        gradleVersion = GradleVersion.version('6.8.2')
+        gradleVersion = GradleVersion.version('6.9')
         template('src/rocker/foo/Example.rocker.html')
 
         and: