diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
index 529e7b2b..8a4302ae 100644
--- a/.github/workflows/android.yml
+++ b/.github/workflows/android.yml
@@ -25,7 +25,6 @@ jobs:
     - run: |
         git submodule sync --recursive
         git submodule update --init --recursive
-    - run: ./gradlew androidDependencies
     - run: ./gradlew clean
     - run: ./gradlew PdCore:pd-core:build
       env:
diff --git a/PdCore/build.gradle b/PdCore/build.gradle
index 8cd944ff..7f0c7784 100644
--- a/PdCore/build.gradle
+++ b/PdCore/build.gradle
@@ -4,7 +4,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.13.2'
+        classpath 'com.android.tools.build:gradle:9.0.1'
     }
 }
 
@@ -23,7 +23,7 @@ allprojects {
 // These are specific to PdCore, but nexusPublishing needs them here:
 // https://github.com/gradle-nexus/publish-plugin/issues/84
 group = 'io.github.libpd.android'
-version = '1.4.1-SNAPSHOT'
+version = '1.4.2-SNAPSHOT'
 
 // Create a Sonatype user token for these environment variables:
 // export ORG_GRADLE_PROJECT_sonatypeUsername="<tokenUsername>"
diff --git a/PdCore/gradle.properties b/PdCore/gradle.properties
index 2d8d1e4d..78ee1127 100644
--- a/PdCore/gradle.properties
+++ b/PdCore/gradle.properties
@@ -1 +1,14 @@
-android.useAndroidX=true
\ No newline at end of file
+android.useAndroidX=true
+
+# Bumping android gradle plugin from 8.13.2 to 9.0.1 breaks pd-core/build.gradle at 2 places:
+#
+# - android.libraryVariants cannot be resolved (used to rename the output aar).
+# It should be replaced with androidComponents{onVariants} but I couldn't get it to work...
+#
+# - android.compileSdk cannot be resolved either (needed to locate the android.jar for building javadoc)
+# I couldn't find a replacement.
+#
+# Using 'android.newDsl=false' is a temporary fix, until a solution is found for these 2 problems:
+
+android.newDsl=false
+
diff --git a/PdTest/build.gradle b/PdTest/build.gradle
index 30323022..28dc4d5b 100644
--- a/PdTest/build.gradle
+++ b/PdTest/build.gradle
@@ -31,7 +31,7 @@ android {
     buildTypes {
         release {
             minifyEnabled true
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
 
diff --git a/README.md b/README.md
index 73f1bb98..3567973a 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ allprojects {
 
 ```gradle
 dependencies {
-    implementation 'io.github.libpd.android:pd-core:1.4.1-SNAPSHOT'
+    implementation 'io.github.libpd.android:pd-core:1.4.2-SNAPSHOT'
 }
 ```
 
diff --git a/build.gradle b/build.gradle
index ddd6dcdb..e483fd3a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.13.2'
+        classpath 'com.android.tools.build:gradle:9.0.1'
     }
 }
 
@@ -20,5 +20,5 @@ ext {
     compileSdk = 34
     androidxLegacySupportVersion = '1.0.0'
     ndkVersion = libs.versions.ndk.get()
-    pdCoreVersion = '1.4.1-SNAPSHOT' // Must match version in PdCore/build.gradle
+    pdCoreVersion = '1.4.2-SNAPSHOT' // Must match version in PdCore/build.gradle
 }