diff --git a/.gitignore b/.gitignore
index 8b61f5b..c95c149 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,5 +4,7 @@ out/
 build/
 /integration-test-db/src/main/resources/adamd/target_version
 gradle-plugin-test/.gradle/
+gradle-plugin-test/gradle/
+gradle-plugin-test/gradlew*
 gradle.properties
 local.properties
diff --git a/core/src/main/java/ch/ergon/adam/core/reflection/ReflectionHelper.java b/core/src/main/java/ch/ergon/adam/core/reflection/ReflectionHelper.java
index 78e9358..b562b81 100644
--- a/core/src/main/java/ch/ergon/adam/core/reflection/ReflectionHelper.java
+++ b/core/src/main/java/ch/ergon/adam/core/reflection/ReflectionHelper.java
@@ -16,7 +16,7 @@ public class ReflectionHelper {
     private static Set<Class<?>> findAllClassesForPackage(String packageName) {
         if (!classesByPackageCache.containsKey(packageName)) {
             try {
-                Set<Class<?>> classes = ClassPath.from(ClassLoader.getSystemClassLoader()).getAllClasses()
+                Set<Class<?>> classes = ClassPath.from(ReflectionHelper.class.getClassLoader()).getAllClasses()
                     .stream()
                     .filter(c -> c.getPackageName().startsWith(packageName))
                     .map(ClassPath.ClassInfo::getName)
diff --git a/gradle-plugin-test/build.gradle b/gradle-plugin-test/build.gradle
index 9dd914d..4042c48 100644
--- a/gradle-plugin-test/build.gradle
+++ b/gradle-plugin-test/build.gradle
@@ -8,14 +8,14 @@ buildscript {
     }
 
     dependencies {
-        classpath 'ch.ergon.adam:postgresql:1.0.0'
-        classpath 'ch.ergon.adam:yml:1.0.0'
+        classpath 'ch.ergon.adam:postgresql:1.2.2'
+        classpath 'ch.ergon.adam:yml:1.2.2'
     }
 }
 
 plugins {
     id 'java'
-    id 'ch.ergon.adam' version '1.0.0'
+    id 'ch.ergon.adam' version '1.2.2'
 }
 
 adam {
diff --git a/gradle-plugin-test/settings.gradle b/gradle-plugin-test/settings.gradle
index c63a3c7..dd8e9ec 100644
--- a/gradle-plugin-test/settings.gradle
+++ b/gradle-plugin-test/settings.gradle
@@ -1 +1,11 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        maven {
+            name = "localPluginRepository"
+            url = uri("/tmp/adam/local-gradle-plugin-repository")
+        }
+    }
+}
+
 rootProject.name = 'adam-gradleplugin-test'