diff --git a/jmx-metrics/build.gradle.kts b/jmx-metrics/build.gradle.kts
index fe42d6f33..d5376e670 100644
--- a/jmx-metrics/build.gradle.kts
+++ b/jmx-metrics/build.gradle.kts
@@ -59,6 +59,8 @@ tasks {
   shadowJar {
     mergeServiceFiles()
 
+    duplicatesStrategy = DuplicatesStrategy.INCLUDE // required for mergeServiceFiles()
+
     manifest {
       attributes["Implementation-Version"] = project.version
     }
diff --git a/jmx-scraper/build.gradle.kts b/jmx-scraper/build.gradle.kts
index e02ee1b07..061fdd03e 100644
--- a/jmx-scraper/build.gradle.kts
+++ b/jmx-scraper/build.gradle.kts
@@ -51,6 +51,8 @@ tasks {
   shadowJar {
     mergeServiceFiles()
 
+    duplicatesStrategy = DuplicatesStrategy.INCLUDE // required for mergeServiceFiles()
+
     manifest {
       attributes["Implementation-Version"] = project.version
     }
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 82364bf2a..ba79c4693 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -1,6 +1,6 @@
 pluginManagement {
   plugins {
-    id("com.gradleup.shadow") version "8.3.9"
+    id("com.gradleup.shadow") version "9.0.2"
     id("io.github.gradle-nexus.publish-plugin") version "2.0.0"
     id("com.gradle.develocity") version "4.1"
   }