diff --git a/libpretixsync/gradle/wrapper/gradle-wrapper.jar b/libpretixsync/gradle/wrapper/gradle-wrapper.jar
index d64cd491..1b33c55b 100644
Binary files a/libpretixsync/gradle/wrapper/gradle-wrapper.jar and b/libpretixsync/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/libpretixsync/gradle/wrapper/gradle-wrapper.properties b/libpretixsync/gradle/wrapper/gradle-wrapper.properties
index a80b22ce..d4081da4 100644
--- a/libpretixsync/gradle/wrapper/gradle-wrapper.properties
+++ b/libpretixsync/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/libpretixsync/gradlew b/libpretixsync/gradlew
index 1aa94a42..23d15a93 100755
--- a/libpretixsync/gradlew
+++ b/libpretixsync/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
@@ -112,7 +114,7 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+CLASSPATH="\\\"\\\""
 
 
 # Determine the Java command to use to start the JVM.
@@ -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.
@@ -211,7 +213,7 @@ DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
         -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
 # Stop when "xargs" is not available.
diff --git a/libpretixsync/gradlew.bat b/libpretixsync/gradlew.bat
index 7101f8e4..5eed7ee8 100644
--- a/libpretixsync/gradlew.bat
+++ b/libpretixsync/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 ##########################################################################
@@ -68,11 +70,11 @@ goto fail
 :execute
 @rem Setup the command line
 
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+set CLASSPATH=
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell
diff --git a/libpretixsync/settings.gradle b/libpretixsync/settings.gradle
index 88ce3ff4..347b5a6e 100644
--- a/libpretixsync/settings.gradle
+++ b/libpretixsync/settings.gradle
@@ -11,8 +11,8 @@ pluginManagement {
 // workaround: plugin definition with version here, so a standalone build is possible
 // but building it inside the multi module project doesn't exit with "unknown version already on classpath" error
 plugins {
-    id "org.jetbrains.kotlin.jvm" version "1.9.23" apply false
-    id "com.google.protobuf" version "0.9.4" apply false
+    id "org.jetbrains.kotlin.jvm" version "2.2.21" apply false
+    id "com.google.protobuf" version "0.9.5" apply false
     id "app.cash.sqldelight" version "2.1.0" apply false
 }
 
diff --git a/libpretixsync/versions.gradle b/libpretixsync/versions.gradle
index c5957209..25b149cd 100644
--- a/libpretixsync/versions.gradle
+++ b/libpretixsync/versions.gradle
@@ -1,4 +1,4 @@
-ext.kotlin_version = '1.9.23'
+ext.kotlin_version = '2.2.21'
 ext.okhttp_version = '4.9.3'
 ext.joda_version = '2.10.10'
 // Use older org.json version to have an environment equivalent to the android platform