diff --git a/build-logic/src/main/kotlin/dev/msfjarvis/claw/gradle/KotlinCommonPlugin.kt b/build-logic/src/main/kotlin/dev/msfjarvis/claw/gradle/KotlinCommonPlugin.kt
index 808e89db..332aa7d0 100644
--- a/build-logic/src/main/kotlin/dev/msfjarvis/claw/gradle/KotlinCommonPlugin.kt
+++ b/build-logic/src/main/kotlin/dev/msfjarvis/claw/gradle/KotlinCommonPlugin.kt
@@ -14,6 +14,7 @@ import org.gradle.api.tasks.testing.logging.TestLogEvent
 import org.gradle.jvm.toolchain.JavaLanguageVersion
 import org.gradle.jvm.toolchain.JavaToolchainSpec
 import org.gradle.kotlin.dsl.withType
+import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 @Suppress("Unused", "UnstableApiUsage")
@@ -30,6 +31,7 @@ class KotlinCommonPlugin : Plugin<Project> {
         compilerOptions {
           allWarningsAsErrors.set(project.providers.environmentVariable("CI").isPresent)
           freeCompilerArgs.addAll(ADDITIONAL_COMPILER_ARGS)
+          languageVersion.set(KotlinVersion.KOTLIN_2_1)
         }
       }
       withType<Test>().configureEach {