diff --git a/src/test/groovy/com/google/protobuf/gradle/AndroidProjectDetectionTest.groovy b/src/test/groovy/com/google/protobuf/gradle/AndroidProjectDetectionTest.groovy
index a4a7008b..95c3a13f 100644
--- a/src/test/groovy/com/google/protobuf/gradle/AndroidProjectDetectionTest.groovy
+++ b/src/test/groovy/com/google/protobuf/gradle/AndroidProjectDetectionTest.groovy
@@ -1,5 +1,8 @@
 package com.google.protobuf.gradle
 
+import com.google.protobuf.gradle.version.AgpVersion
+import com.google.protobuf.gradle.version.GradleVersion
+
 import static com.google.protobuf.gradle.ProtobufPluginTestHelper.buildAndroidProject
 
 import groovy.transform.CompileDynamic
@@ -13,8 +16,8 @@ import spock.lang.Unroll
  */
 @CompileDynamic
 class AndroidProjectDetectionTest extends Specification {
-  private static final List<String> GRADLE_VERSION = ["5.6"]
-  private static final List<String> ANDROID_PLUGIN_VERSION = ["3.5.0"]
+  private static final List<String> GRADLE_VERSION = [GradleVersion.VERSION_5_6, GradleVersion.VERSION_7_4_2]
+  private static final List<String> ANDROID_PLUGIN_VERSION = [AgpVersion.VERSION_3_5_0, AgpVersion.VERSION_7_2_1]
 
   static void appendUtilIsAndroidProjectCheckTask(File buildFile, boolean assertResult) {
     buildFile << """
diff --git a/src/test/groovy/com/google/protobuf/gradle/ProtobufAndroidPluginKotlinTest.groovy b/src/test/groovy/com/google/protobuf/gradle/ProtobufAndroidPluginKotlinTest.groovy
index 555c0ffb..a974b83e 100644
--- a/src/test/groovy/com/google/protobuf/gradle/ProtobufAndroidPluginKotlinTest.groovy
+++ b/src/test/groovy/com/google/protobuf/gradle/ProtobufAndroidPluginKotlinTest.groovy
@@ -1,5 +1,9 @@
 package com.google.protobuf.gradle
 
+import com.google.protobuf.gradle.version.AgpVersion
+import com.google.protobuf.gradle.version.GradleVersion
+import com.google.protobuf.gradle.version.KotlinVersion
+
 import static com.google.protobuf.gradle.ProtobufPluginTestHelper.buildAndroidProject
 
 import groovy.transform.CompileDynamic
@@ -10,9 +14,9 @@ import spock.lang.Unroll
 
 @CompileDynamic
 class ProtobufAndroidPluginKotlinTest extends Specification {
-  private static final List<String> GRADLE_VERSION = ["5.6", "6.5-milestone-1"]
-  private static final List<String> ANDROID_PLUGIN_VERSION = ["3.5.0", "4.1.0-alpha10"]
-  private static final List<String> KOTLIN_VERSION = ["1.3.20"]
+  private static final List<String> GRADLE_VERSION = [GradleVersion.VERSION_5_6, GradleVersion.VERSION_6_5_MILESTONE_1, GradleVersion.VERSION_7_4_2]
+  private static final List<String> ANDROID_PLUGIN_VERSION = [AgpVersion.VERSION_3_5_0, AgpVersion.VERSION_4_1_APLHA10, AgpVersion.VERSION_7_2_1]
+  private static final List<String> KOTLIN_VERSION = [KotlinVersion.VERSION_1_3_20]
 
   /**
    * This test may take a significant amount of Gradle daemon Metaspace memory in some
@@ -48,6 +52,6 @@ class ProtobufAndroidPluginKotlinTest extends Specification {
     where:
     agpVersion << ANDROID_PLUGIN_VERSION
     gradleVersion << GRADLE_VERSION
-    kotlinVersion << KOTLIN_VERSION + KOTLIN_VERSION
+    kotlinVersion << KOTLIN_VERSION + KOTLIN_VERSION + KOTLIN_VERSION
     }
 }
diff --git a/src/test/groovy/com/google/protobuf/gradle/ProtobufAndroidPluginTest.groovy b/src/test/groovy/com/google/protobuf/gradle/ProtobufAndroidPluginTest.groovy
index 300f8b3a..caca8bc2 100644
--- a/src/test/groovy/com/google/protobuf/gradle/ProtobufAndroidPluginTest.groovy
+++ b/src/test/groovy/com/google/protobuf/gradle/ProtobufAndroidPluginTest.groovy
@@ -1,5 +1,8 @@
 package com.google.protobuf.gradle
 
+import com.google.protobuf.gradle.version.AgpVersion
+import com.google.protobuf.gradle.version.GradleVersion
+
 import static com.google.protobuf.gradle.ProtobufPluginTestHelper.buildAndroidProject
 import static com.google.protobuf.gradle.ProtobufPluginTestHelper.getAndroidGradleRunner
 
@@ -15,8 +18,8 @@ import spock.lang.Unroll
  */
 @CompileDynamic
 class ProtobufAndroidPluginTest extends Specification {
-  private static final List<String> GRADLE_VERSION = ["5.6", "6.5", "6.8"]
-  private static final List<String> ANDROID_PLUGIN_VERSION = ["3.5.0", "4.1.0", "4.2.0-alpha10"]
+  private static final List<String> GRADLE_VERSION = [GradleVersion.VERSION_5_6, GradleVersion.VERSION_6_5, GradleVersion.VERSION_6_8, GradleVersion.VERSION_7_4_2]
+  private static final List<String> ANDROID_PLUGIN_VERSION = [AgpVersion.VERSION_3_5_0, AgpVersion.VERSION_4_1_0, AgpVersion.VERSION_4_2_APLHA10, AgpVersion.VERSION_7_2_1]
 
   @Unroll
   void "testProjectAndroid should be successfully executed [android #agpVersion, gradle #gradleVersion]"() {
@@ -103,8 +106,8 @@ class ProtobufAndroidPluginTest extends Specification {
     result.task(":testProjectAndroid:assembleDebug").outcome == TaskOutcome.SUCCESS
 
     where:
-    agpVersion << ANDROID_PLUGIN_VERSION.takeRight(1)
-    gradleVersion << GRADLE_VERSION.takeRight(1)
+    agpVersion << [AgpVersion.VERSION_4_2_APLHA10]
+    gradleVersion << [GradleVersion.VERSION_6_8]
   }
 
   @Unroll
@@ -168,7 +171,7 @@ class ProtobufAndroidPluginTest extends Specification {
     !result.output.contains("This makes you vulnerable to https://github.com/google/protobuf-gradle-plugin/issues/248")
 
     where:
-    agpVersion << ANDROID_PLUGIN_VERSION.takeRight(1)
-    gradleVersion << GRADLE_VERSION.takeRight(1)
+    agpVersion << [AgpVersion.VERSION_4_2_APLHA10]
+    gradleVersion << [GradleVersion.VERSION_6_8]
   }
 }
diff --git a/src/test/groovy/com/google/protobuf/gradle/ProtobufJavaPluginTest.groovy b/src/test/groovy/com/google/protobuf/gradle/ProtobufJavaPluginTest.groovy
index 214ce016..13757b73 100644
--- a/src/test/groovy/com/google/protobuf/gradle/ProtobufJavaPluginTest.groovy
+++ b/src/test/groovy/com/google/protobuf/gradle/ProtobufJavaPluginTest.groovy
@@ -1,6 +1,8 @@
 package com.google.protobuf.gradle
 
 import com.google.common.collect.ImmutableSet
+import com.google.protobuf.gradle.version.GradleVersion
+import com.google.protobuf.gradle.version.KotlinVersion
 import groovy.transform.CompileDynamic
 import org.gradle.api.Project
 import org.gradle.testfixtures.ProjectBuilder
@@ -16,8 +18,8 @@ import spock.lang.Unroll
 @CompileDynamic
 class ProtobufJavaPluginTest extends Specification {
   // Current supported version is Gradle 5+.
-  private static final List<String> GRADLE_VERSIONS = ["5.6", "6.0", "6.7.1"]
-  private static final List<String> KOTLIN_VERSIONS = ["1.3.20", "1.3.30"]
+  private static final List<String> GRADLE_VERSIONS = [GradleVersion.VERSION_5_6, GradleVersion.VERSION_5_6, GradleVersion.VERSION_6_7_1, GradleVersion.VERSION_7_4_2]
+  private static final List<String> KOTLIN_VERSIONS = [KotlinVersion.VERSION_1_3_20, KotlinVersion.VERSION_1_3_30]
 
   void "testApplying java and com.google.protobuf adds corresponding task to project"() {
     given: "a basic project with java and com.google.protobuf"
@@ -121,7 +123,7 @@ class ProtobufJavaPluginTest extends Specification {
     ProtobufPluginTestHelper.verifyProjectDir(projectDir)
 
     where:
-    gradleVersion << GRADLE_VERSIONS.takeRight(1)
+    gradleVersion << [GradleVersion.VERSION_6_7_1]
   }
 
   @Unroll
diff --git a/src/test/groovy/com/google/protobuf/gradle/ProtobufKotlinDslCopySpecTest.groovy b/src/test/groovy/com/google/protobuf/gradle/ProtobufKotlinDslCopySpecTest.groovy
index 84404fc9..86860998 100644
--- a/src/test/groovy/com/google/protobuf/gradle/ProtobufKotlinDslCopySpecTest.groovy
+++ b/src/test/groovy/com/google/protobuf/gradle/ProtobufKotlinDslCopySpecTest.groovy
@@ -1,5 +1,6 @@
 package com.google.protobuf.gradle
 
+import com.google.protobuf.gradle.version.GradleVersion
 import groovy.transform.CompileDynamic
 import org.gradle.testkit.runner.BuildResult
 import org.gradle.testkit.runner.GradleRunner
@@ -12,7 +13,7 @@ import spock.lang.Unroll
  */
 @CompileDynamic
 class ProtobufKotlinDslCopySpecTest extends Specification {
-  private static final List<String> GRADLE_VERSIONS = ["5.6", "6.0", "6.7.1", "7.0"]
+  private static final List<String> GRADLE_VERSIONS = [GradleVersion.VERSION_5_6, GradleVersion.VERSION_6_0, GradleVersion.VERSION_6_7_1, GradleVersion.VERSION_7_0]
 
   @Unroll
   void "testProjectKotlinDslCopySpec should declare explicit copy spec [gradle #gradleVersion]"() {
diff --git a/src/test/groovy/com/google/protobuf/gradle/ProtobufKotlinDslPluginTest.groovy b/src/test/groovy/com/google/protobuf/gradle/ProtobufKotlinDslPluginTest.groovy
index e9125d39..89d2ad11 100644
--- a/src/test/groovy/com/google/protobuf/gradle/ProtobufKotlinDslPluginTest.groovy
+++ b/src/test/groovy/com/google/protobuf/gradle/ProtobufKotlinDslPluginTest.groovy
@@ -1,5 +1,8 @@
 package com.google.protobuf.gradle
 
+import com.google.protobuf.gradle.version.AgpVersion
+import com.google.protobuf.gradle.version.GradleVersion
+
 import static com.google.protobuf.gradle.ProtobufPluginTestHelper.buildAndroidProject
 
 import groovy.transform.CompileDynamic
@@ -14,8 +17,8 @@ import spock.lang.Unroll
  */
 @CompileDynamic
 class ProtobufKotlinDslPluginTest extends Specification {
-  private static final List<String> GRADLE_VERSIONS = ["5.6", "6.1.1", "6.5"]
-  private static final List<String> ANDROID_PLUGIN_VERSION = ["3.5.0", "4.0.0", "4.1.0"]
+  private static final List<String> GRADLE_VERSIONS = [GradleVersion.VERSION_5_6, GradleVersion.VERSION_6_1_1, GradleVersion.VERSION_6_5, GradleVersion.VERSION_7_4_2]
+  private static final List<String> ANDROID_PLUGIN_VERSION = [AgpVersion.VERSION_3_5_0, AgpVersion.VERSION_4_0_0, AgpVersion.VERSION_4_1_0, AgpVersion.VERSION_7_2_1]
 
   @Unroll
   void "testProjectKotlinDsl should be successfully executed (java-only project) [gradle #gradleVersion]"() {
diff --git a/src/test/groovy/com/google/protobuf/gradle/version/AgpVersion.groovy b/src/test/groovy/com/google/protobuf/gradle/version/AgpVersion.groovy
new file mode 100644
index 00000000..102d92fb
--- /dev/null
+++ b/src/test/groovy/com/google/protobuf/gradle/version/AgpVersion.groovy
@@ -0,0 +1,10 @@
+package com.google.protobuf.gradle.version
+
+class AgpVersion {
+    public static String VERSION_3_5_0 = "3.5.0"
+    public static String VERSION_4_0_0 = "4.0.0"
+    public static String VERSION_4_1_0 = "4.1.0"
+    public static String VERSION_4_1_APLHA10 = "4.1.0-alpha10"
+    public static String VERSION_4_2_APLHA10 = "4.2.0-alpha10"
+    public static String VERSION_7_2_1 = "7.2.1"
+}
diff --git a/src/test/groovy/com/google/protobuf/gradle/version/GradleVersion.groovy b/src/test/groovy/com/google/protobuf/gradle/version/GradleVersion.groovy
new file mode 100644
index 00000000..fa1ae855
--- /dev/null
+++ b/src/test/groovy/com/google/protobuf/gradle/version/GradleVersion.groovy
@@ -0,0 +1,13 @@
+package com.google.protobuf.gradle.version
+
+class GradleVersion {
+    public static String VERSION_5_6 = "5.6"
+    public static String VERSION_6_0 = "6.0"
+    public static String VERSION_6_1_1 = "6.1.1"
+    public static String VERSION_6_5_MILESTONE_1 = "6.5-milestone-1"
+    public static String VERSION_6_5 = "6.5"
+    public static String VERSION_6_7_1 = "6.7.1"
+    public static String VERSION_6_8 = "6.8"
+    public static String VERSION_7_0 = "7.0"
+    public static String VERSION_7_4_2 = "7.4.2"
+}
diff --git a/src/test/groovy/com/google/protobuf/gradle/version/KotlinVersion.groovy b/src/test/groovy/com/google/protobuf/gradle/version/KotlinVersion.groovy
new file mode 100644
index 00000000..4c83e8e8
--- /dev/null
+++ b/src/test/groovy/com/google/protobuf/gradle/version/KotlinVersion.groovy
@@ -0,0 +1,6 @@
+package com.google.protobuf.gradle.version
+
+class KotlinVersion {
+    public static String VERSION_1_3_20 = "1.3.20"
+    public static String VERSION_1_3_30 = "1.3.30"
+}
diff --git a/testProjectAndroidBase/build_base.gradle b/testProjectAndroidBase/build_base.gradle
index fe141ff3..25c7889f 100644
--- a/testProjectAndroidBase/build_base.gradle
+++ b/testProjectAndroidBase/build_base.gradle
@@ -96,22 +96,22 @@ protobuf {
 }
 
 dependencies {
-    compile 'com.android.support:appcompat-v7:23.4.0'
-    compile 'com.squareup.okhttp:okhttp:2.7.5'
-    compile 'javax.annotation:javax.annotation-api:1.2'
-    compile 'com.google.protobuf:protobuf-lite:3.0.0'
-    compile 'io.grpc:grpc-core:1.0.0-pre2'
-    compile 'io.grpc:grpc-stub:1.0.0-pre2'
-    compile 'io.grpc:grpc-okhttp:1.0.0-pre2'
-    compile('io.grpc:grpc-protobuf-lite:1.0.0-pre2') {
+    implementation 'com.android.support:appcompat-v7:23.4.0'
+    implementation 'com.squareup.okhttp:okhttp:2.7.5'
+    implementation 'javax.annotation:javax.annotation-api:1.2'
+    implementation 'com.google.protobuf:protobuf-lite:3.0.0'
+    implementation 'io.grpc:grpc-core:1.0.0-pre2'
+    implementation 'io.grpc:grpc-stub:1.0.0-pre2'
+    implementation 'io.grpc:grpc-okhttp:1.0.0-pre2'
+    implementation('io.grpc:grpc-protobuf-lite:1.0.0-pre2') {
       // Otherwise Android compile will complain "Multiple dex files define ..."
       exclude module: "protobuf-lite"
     }
-    compile(project(':testProjectLite')) {
+    implementation(project(':testProjectLite')) {
       exclude module: "protobuf-lite"
     }
     protobuf files('lib/protos.jar')
-    testCompile 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.12'
 }
 
 def assertJavaCompileHasProtoGeneratedDir(Object variant, Collection<String> codegenPlugins) {
diff --git a/testProjectBase/build_base.gradle b/testProjectBase/build_base.gradle
index 5c70a715..eedc073c 100644
--- a/testProjectBase/build_base.gradle
+++ b/testProjectBase/build_base.gradle
@@ -29,13 +29,13 @@ dependencies {
   protobuf files("ext/")
   testProtobuf files("lib/protos-test.tar.gz")
 
-  compile protobufDep
-  testCompile 'junit:junit:4.12'
+  implementation protobufDep
+  testImplementation 'junit:junit:4.12'
   // KotlinFooTest.kt requires reflection utilities
-  testCompile "org.jetbrains.kotlin:kotlin-reflect:1.2.0"
-  grpcCompile protobufDep
-  grpcCompile 'io.grpc:grpc-stub:1.0.0-pre2'
-  grpcCompile 'io.grpc:grpc-protobuf:1.0.0-pre2'
+  testImplementation "org.jetbrains.kotlin:kotlin-reflect:1.2.0"
+  grpcImplementation protobufDep
+  grpcImplementation 'io.grpc:grpc-stub:1.0.0-pre2'
+  grpcImplementation 'io.grpc:grpc-protobuf:1.0.0-pre2'
 }
 
 protobuf {
@@ -65,6 +65,8 @@ jar {
     from sourceSet.output
     dependsOn sourceSet.getCompileTaskName('java')
   }
+
+  duplicatesStrategy(DuplicatesStrategy.INCLUDE)
 }
 
 def assertJavaCompileHasProtoGeneratedDir(String sourceSet, Collection<String> codegenPlugins) {
diff --git a/testProjectBuildTimeProto/build.gradle b/testProjectBuildTimeProto/build.gradle
index 2066c0b4..a4ba1364 100644
--- a/testProjectBuildTimeProto/build.gradle
+++ b/testProjectBuildTimeProto/build.gradle
@@ -8,7 +8,7 @@ repositories {
 }
 
 dependencies {
-    compile 'com.google.protobuf:protobuf-java:3.0.0'
+    implementation 'com.google.protobuf:protobuf-java:3.0.0'
 }
 
 sourceSets {
@@ -43,4 +43,4 @@ protobuf {
     generateProtoTasks {
         all().each { task -> task.dependsOn generateProtobuf }
     }
-}
\ No newline at end of file
+}
diff --git a/testProjectCustomProtoDir/build.gradle b/testProjectCustomProtoDir/build.gradle
index 8023a13e..12fe0268 100644
--- a/testProjectCustomProtoDir/build.gradle
+++ b/testProjectCustomProtoDir/build.gradle
@@ -33,9 +33,9 @@ sourceSets {
 }
 
 dependencies {
-    compile 'com.google.protobuf:protobuf-java:3.0.0'
+    implementation 'com.google.protobuf:protobuf-java:3.0.0'
 
-    testCompile 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.12'
 }
 
 protobuf.protoc {
diff --git a/testProjectDependent/build.gradle b/testProjectDependent/build.gradle
index d4cc2dc8..6336b1d3 100644
--- a/testProjectDependent/build.gradle
+++ b/testProjectDependent/build.gradle
@@ -14,10 +14,10 @@ repositories {
 }
 
 dependencies {
-    compile 'com.google.protobuf:protobuf-java:3.0.0'
-    compile project(':testProject')
+    implementation 'com.google.protobuf:protobuf-java:3.0.0'
+    implementation project(':testProject')
 
-    testCompile 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.12'
 }
 
 protobuf.protoc {
diff --git a/testProjectLite/build.gradle b/testProjectLite/build.gradle
index 4c7f2598..11cf2c88 100644
--- a/testProjectLite/build.gradle
+++ b/testProjectLite/build.gradle
@@ -13,9 +13,9 @@ sourceCompatibility = JavaVersion.VERSION_1_7
 targetCompatibility = JavaVersion.VERSION_1_7
 
 dependencies {
-    compile 'com.google.protobuf:protobuf-lite:3.0.0'
+    implementation 'com.google.protobuf:protobuf-lite:3.0.0'
     protobuf files("ext/")
-    testCompile 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.12'
 }
 
 protobuf {