diff --git a/conventions/build.gradle.kts b/conventions/build.gradle.kts
index 5bf0e1e870f8..8faedfec7709 100644
--- a/conventions/build.gradle.kts
+++ b/conventions/build.gradle.kts
@@ -56,7 +56,6 @@ dependencies {
   // When updating, update above in plugins too
   implementation("com.diffplug.spotless:spotless-plugin-gradle:7.2.1")
   implementation("com.google.guava:guava:33.4.8-jre")
-  implementation("gradle.plugin.com.google.protobuf:protobuf-gradle-plugin:0.8.18")
   implementation("com.gradleup.shadow:shadow-gradle-plugin:8.3.9")
   implementation("org.apache.httpcomponents:httpclient:4.5.14")
   implementation("com.gradle.develocity:com.gradle.develocity.gradle.plugin:4.1.1")
diff --git a/instrumentation/armeria/armeria-grpc-1.14/javaagent/build.gradle.kts b/instrumentation/armeria/armeria-grpc-1.14/javaagent/build.gradle.kts
index 93bcfca7ee48..1b798164b322 100644
--- a/instrumentation/armeria/armeria-grpc-1.14/javaagent/build.gradle.kts
+++ b/instrumentation/armeria/armeria-grpc-1.14/javaagent/build.gradle.kts
@@ -24,6 +24,11 @@ dependencies {
   testLibrary("com.linecorp.armeria:armeria-junit5:1.14.0")
 }
 
+tasks.named<Checkstyle>("checkstyleTest") {
+  // exclude generated classes
+  exclude("**/example/**")
+}
+
 val latestDepTest = findProperty("testLatestDeps") as Boolean
 protobuf {
   protoc {
diff --git a/instrumentation/grpc-1.6/testing/build.gradle.kts b/instrumentation/grpc-1.6/testing/build.gradle.kts
index 259d70dbb53e..374be72da2b2 100644
--- a/instrumentation/grpc-1.6/testing/build.gradle.kts
+++ b/instrumentation/grpc-1.6/testing/build.gradle.kts
@@ -31,6 +31,11 @@ tasks {
       compilerArgs.add("-Xlint:-cast")
     }
   }
+
+  named<Checkstyle>("checkstyleMain") {
+    // exclude generated classes
+    exclude("**/example/**")
+  }
 }
 
 protobuf {
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 52d6bafdd8a1..eca72f6776c4 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -8,6 +8,8 @@ pluginManagement {
     id("org.xbib.gradle.plugin.jflex") version "3.0.2"
     id("org.unbroken-dome.xjc") version "2.0.0"
     id("org.graalvm.buildtools.native") version "0.11.0"
+    id("com.google.osdetector") version "1.7.3"
+    id("com.google.protobuf") version "0.9.5"
   }
 }