diff --git a/app-wearos/build.gradle b/app-wearos/build.gradle
index 13e7a0d60..767264b7a 100644
--- a/app-wearos/build.gradle
+++ b/app-wearos/build.gradle
@@ -1,6 +1,5 @@
 plugins {
     alias(libs.plugins.android.application)
-    alias(libs.plugins.kotlin.android)
     alias(libs.plugins.kotlin.compose)
     alias(libs.plugins.ktlint)
 }
@@ -9,6 +8,7 @@ apply from: "../playFlavor.gradle"
 
 android {
     namespace "de.danoeh.antennapod.wearos"
+    enableKotlin true
 
     defaultConfig {
         applicationId "de.danoeh.antennapod"
@@ -45,10 +45,6 @@ android {
         compose true
     }
 
-    kotlinOptions {
-        jvmTarget = "21"
-    }
-
     lint {
         disable "UnusedResources"
     }
diff --git a/app/build.gradle b/app/build.gradle
index f0231b5d0..d11bcece4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -133,6 +133,8 @@ dependencies {
     androidTestImplementation libs.androidx.test.runner
     androidTestImplementation libs.androidx.test.rules
     androidTestImplementation libs.androidx.test.ext.junit
+    androidTestImplementation libs.hamcrest
+    androidTestImplementation libs.hamcrest.library
 }
 
 if (project.hasProperty("antennaPodPlayPublisherCredentials")) {
diff --git a/common.gradle b/common.gradle
index b5db25d05..122be0c2f 100644
--- a/common.gradle
+++ b/common.gradle
@@ -1,5 +1,6 @@
 android {
     compileSdk 36
+    enableKotlin false
 
     defaultConfig {
         minSdk 23
@@ -18,7 +19,7 @@ android {
 
     buildTypes {
         release {
-            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard.cfg"
+            proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "proguard.cfg"
             resValue "string", "app_name", "AntennaPod"
         }
         debug {
@@ -65,6 +66,7 @@ android {
     buildFeatures {
         viewBinding true
         buildConfig true
+        resValues true
     }
 }
 
diff --git a/gradle.properties b/gradle.properties
index 19058640c..cd062ccf5 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,4 @@
-android.useAndroidX=true
-org.gradle.jvmargs=-Xmx4096m
+android.newDsl=false
+android.onlyEnableUnitTestForTheTestedBuildType=false
 android.nonTransitiveRClass=false
+org.gradle.jvmargs=-Xmx4096m
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 6b791271a..895300d04 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-agp = "8.11.0"
+agp = "9.0.1"
 kotlin = "2.3.20"
 media3 = "1.9.0"
 wear-compose = "1.6.0"
@@ -76,13 +76,15 @@ nanohttpd = { module = "com.nanohttpd:nanohttpd", version = "2.1.1" }
 awaitility = { module = "org.awaitility:awaitility", version = "3.1.6" }
 junit = { module = "junit:junit", version = "4.13" }
 robolectric = { module = "org.robolectric:robolectric", version = "4.16" }
-mockito-core = { module = "org.mockito:mockito-core", version = "5.15.2" }
+mockito-core = { module = "org.mockito:mockito-core", version = "5.20.0" }
+hamcrest = { module = "org.hamcrest:hamcrest", version = "2.2" }
+hamcrest-library = { module = "org.hamcrest:hamcrest-library", version = "2.2" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
 android-library = { id = "com.android.library", version.ref = "agp" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
-spotbugs = { id = "com.github.spotbugs", version = "4.8.0" }
+spotbugs = { id = "com.github.spotbugs", version = "6.4.8" }
 ktlint = { id = "org.jlleitschuh.gradle.ktlint", version = "12.3.0" }
-triplet-play = { id = "com.github.triplet.play", version = "3.9.0" }
+triplet-play = { id = "com.github.triplet.play", version = "4.0.0" }
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index d64cd4917..9bbc975c7 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 68f6c2ca1..37f78a6af 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,7 +1,6 @@
-#Sun Aug 17 17:07:23 CEST 2025
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/gradlew b/gradlew
index 1aa94a426..faf93008b 100755
--- a/gradlew
+++ b/gradlew
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -84,7 +86,7 @@ done
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
 # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -203,7 +205,7 @@ fi
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Collect all arguments for the java command:
-#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
 #     and any embedded shellness will be escaped.
 #   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
 #     treated as '${Hostname}' itself on the command line.
diff --git a/gradlew.bat b/gradlew.bat
index 7101f8e46..9b42019c7 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
diff --git a/net/download/service-interface/build.gradle b/net/download/service-interface/build.gradle
index 3a79e19ca..696d8eae0 100644
--- a/net/download/service-interface/build.gradle
+++ b/net/download/service-interface/build.gradle
@@ -1,6 +1,5 @@
 plugins {
     alias(libs.plugins.android.library)
-    id("java-test-fixtures")
 }
 apply from: "../../../common.gradle"
 apply from: "../../../playFlavor.gradle"
diff --git a/net/download/service/build.gradle b/net/download/service/build.gradle
index 9599f65ad..0803e7e6c 100644
--- a/net/download/service/build.gradle
+++ b/net/download/service/build.gradle
@@ -1,6 +1,5 @@
 plugins {
     alias(libs.plugins.android.library)
-    id("java-test-fixtures")
 }
 apply from: "../../../common.gradle"
 apply from: "../../../playFlavor.gradle"