diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 950490b..3ffff29 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        jdk: [11, 17, 21]
+        jdk: [17, 21, 25]
 
     runs-on: ubuntu-latest
 
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..028ae5c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+.gradle/
+build/
+.idea/
+.tmp/
+*.hprof
+heapdump_jmemb_*.hprof
diff --git a/build.gradle b/build.gradle
index 659822d..78d9a96 100644
--- a/build.gradle
+++ b/build.gradle
@@ -42,6 +42,7 @@ dependencies {
     testImplementation "org.junit.jupiter:junit-jupiter-api:$JUNIT_VERSION"
     testImplementation "org.junit.jupiter:junit-jupiter-params:$JUNIT_VERSION"
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$JUNIT_VERSION"
+    testRuntimeOnly "org.junit.platform:junit-platform-launcher:1.11.3" // required explicitly since Gradle 9
     testRuntimeOnly "ch.qos.logback:logback-classic:$LOGBACK_VERSION"
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a441313..c61a118 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME