diff --git a/build.gradle b/build.gradle
index 05681dc..02e8e4b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    id "org.jetbrains.kotlin.jvm" version "2.4.20" apply false
+    id "org.jetbrains.kotlin.jvm" version "2.4.21" apply false
     id "java-library"
     id "maven-publish"
     id("net.neoforged.licenser") version "0.7.5" apply false
diff --git a/runtime-compiler/build.gradle b/runtime-compiler/build.gradle
index d1c1bb6..7c7f6a6 100644
--- a/runtime-compiler/build.gradle
+++ b/runtime-compiler/build.gradle
@@ -5,7 +5,7 @@ plugins {
 dependencies {
     api project(":runtime")
 
-    testImplementation("org.jetbrains.kotlin:kotlin-stdlib:2.4.20")
+    testImplementation("org.jetbrains.kotlin:kotlin-stdlib:2.4.21")
 }
 
 // Regenerates src/test/resources/expectations.txt with MolangJS (needs Node.js).