diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index ccebba77..c1962a79 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 bdc9a83b..0c85a1f7 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-8.0.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-bin.zip
 networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index 79a61d42..aeb74cbb 100755
--- a/gradlew
+++ b/gradlew
@@ -85,9 +85,6 @@ done
 APP_BASE_NAME=${0##*/}
 APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
-
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
 
@@ -197,6 +194,10 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in
diff --git a/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/MavenPublishPluginPlatformTest.kt b/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/MavenPublishPluginPlatformTest.kt
index 51d11fa6..031df32a 100644
--- a/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/MavenPublishPluginPlatformTest.kt
+++ b/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/MavenPublishPluginPlatformTest.kt
@@ -316,7 +316,7 @@ class MavenPublishPluginPlatformTest {
     assertThat(result).module().isSigned()
     assertThat(result).sourcesJar().exists()
     assertThat(result).sourcesJar().isSigned()
-    if (kotlinVersion < KotlinVersion.KT_1_8_BETA) {
+    if (kotlinVersion < KotlinVersion.KT_1_8_20) {
       assertThat(result).sourcesJar().containsAllSourceFiles()
     } else {
       assertThat(result).sourcesJar().containsSourceSetFiles("commonMain")
@@ -402,7 +402,7 @@ class MavenPublishPluginPlatformTest {
     assertThat(result).module().isSigned()
     assertThat(result).sourcesJar().exists()
     assertThat(result).sourcesJar().isSigned()
-    if (kotlinVersion < KotlinVersion.KT_1_8_BETA) {
+    if (kotlinVersion < KotlinVersion.KT_1_8_20) {
       assertThat(result).sourcesJar().containsAllSourceFiles()
     } else {
       assertThat(result).sourcesJar().containsSourceSetFiles("commonMain")
diff --git a/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/MavenPublishPluginSpecialCaseTest.kt b/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/MavenPublishPluginSpecialCaseTest.kt
index e74838e3..fad629fc 100644
--- a/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/MavenPublishPluginSpecialCaseTest.kt
+++ b/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/MavenPublishPluginSpecialCaseTest.kt
@@ -39,7 +39,7 @@ class MavenPublishPluginSpecialCaseTest {
     )
     assertThat(result).module().exists()
     assertThat(result).sourcesJar().exists()
-    if (kotlinVersion < KotlinVersion.KT_1_8_BETA) {
+    if (kotlinVersion < KotlinVersion.KT_1_8_20) {
       assertThat(result).sourcesJar().containsAllSourceFiles()
     } else {
       assertThat(result).sourcesJar().containsSourceSetFiles("commonMain")
@@ -105,7 +105,7 @@ class MavenPublishPluginSpecialCaseTest {
     )
     assertThat(result).module().exists()
     assertThat(result).sourcesJar().exists()
-    if (kotlinVersion < KotlinVersion.KT_1_8_BETA) {
+    if (kotlinVersion < KotlinVersion.KT_1_8_20) {
       assertThat(result).sourcesJar().containsAllSourceFiles()
     } else {
       assertThat(result).sourcesJar().containsSourceSetFiles("commonMain")
diff --git a/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/TestOptions.kt b/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/TestOptions.kt
index abc288e7..f15ec0c9 100644
--- a/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/TestOptions.kt
+++ b/plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/TestOptions.kt
@@ -54,13 +54,10 @@ enum class AgpVersion(
 
 enum class KotlinVersion(val value: String) {
   // minimum supported
-  KT_1_7("1.7.0"),
+  KT_1_7_0("1.7.0"),
 
   // stable
-  KT_1_8("1.8.10"),
-
-  // preview
-  KT_1_8_BETA("1.8.20"),
+  KT_1_8_20("1.8.20"),
 }
 
 enum class GradleVersion(val value: String) {
@@ -68,16 +65,14 @@ enum class GradleVersion(val value: String) {
   GRADLE_7_4("7.4"),
 
   // stable
-  GRADLE_8_0("8.0.2"),
-
-  // preview
-  GRADLE_8_1("8.1-rc-2"),
+  GRADLE_8_1("8.1"),
   ;
 
   companion object {
     // aliases for the skipped version to be able to reference the correct one in AgpVersion
-    val GRADLE_7_5 = GRADLE_8_0
-    val GRADLE_7_6 = GRADLE_8_0
+    val GRADLE_7_5 = GRADLE_8_1
+    val GRADLE_7_6 = GRADLE_8_1
+    val GRADLE_8_0 = GRADLE_8_1
   }
 }
 
@@ -86,5 +81,5 @@ enum class GradlePluginPublish(val version: String) {
   GRADLE_PLUGIN_PUBLISH_1_0("1.0.0"),
 
   // stable
-  GRADLE_PLUGIN_PUBLISH_1_1("1.1.0"),
+  GRADLE_PLUGIN_PUBLISH_1_2("1.2.0"),
 }
diff --git a/plugin/src/main/kotlin/com/vanniktech/maven/publish/Platform.kt b/plugin/src/main/kotlin/com/vanniktech/maven/publish/Platform.kt
index b522341b..64e788d5 100644
--- a/plugin/src/main/kotlin/com/vanniktech/maven/publish/Platform.kt
+++ b/plugin/src/main/kotlin/com/vanniktech/maven/publish/Platform.kt
@@ -9,7 +9,6 @@ import org.gradle.api.plugins.jvm.internal.JvmModelingServices
 import org.gradle.api.plugins.jvm.internal.JvmVariantBuilder
 import org.gradle.api.provider.Provider
 import org.gradle.api.publish.maven.MavenPublication
-import org.gradle.api.tasks.SourceSet
 import org.gradle.api.tasks.TaskProvider
 import org.gradle.configurationcache.extensions.serviceOf
 import org.gradle.jvm.tasks.Jar
@@ -493,13 +492,13 @@ private fun setupTestFixtures(project: Project, sourcesJar: Boolean) {
       val action = Action<JvmVariantBuilder> {
         it.withSourcesJar().published()
       }
-      if (GradleVersion.current() >= GradleVersion.version("8.1-rc-1")) {
+      if (GradleVersion.current() >= GradleVersion.version("8.1")) {
         val extension = project.extensions.getByType(JavaPluginExtension::class.java)
         val testFixturesSourceSet = extension.sourceSets.maybeCreate(variant)
-        val method = services.javaClass.getMethod("createJvmVariant", String::class.java, SourceSet::class.java, Action::class.java)
-        method.invoke(services, variant, testFixturesSourceSet, action)
+        services.createJvmVariant(variant, testFixturesSourceSet, action)
       } else {
-        project.serviceOf<JvmModelingServices>().createJvmVariant(variant, action)
+        val method = services.javaClass.getMethod("createJvmVariant", String::class.java, Action::class.java)
+        method.invoke(services, variant, action)
       }
     }