diff --git a/.github/workflows/bld.yml b/.github/workflows/bld.yml
index 2d75217..b5a8fee 100644
--- a/.github/workflows/bld.yml
+++ b/.github/workflows/bld.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         java-version: [ 17, 21, 24 ]
-        kotlin-version: [ 1.9.25, 2.0.21, 2.1.20 ]
+        kotlin-version: [ 1.9.25, 2.0.21, 2.1.21 ] 
         os: [ ubuntu-latest, windows-latest, macos-latest ]
 
     runs-on: ${{ matrix.os }}
diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml
new file mode 100644
index 0000000..43546f2
--- /dev/null
+++ b/.idea/kotlinc.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Kotlin2JsCompilerArguments">
+    <option name="moduleKind" value="plain" />
+  </component>
+  <component name="Kotlin2JvmCompilerArguments">
+    <option name="jvmTarget" value="11" />
+  </component>
+  <component name="KotlinCommonCompilerArguments">
+    <option name="apiVersion" value="1.9" />
+    <option name="languageVersion" value="1.9" />
+  </component>
+  <component name="KotlinJpsPluginSettings">
+    <option name="version" value="2.1.21" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/README.md b/README.md
index 02d7aae..75e9103 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 [![License (3-Clause BSD)](https://img.shields.io/badge/license-BSD%203--Clause-blue.svg?style=flat-square)](https://opensource.org/licenses/BSD-3-Clause)
-[![Kotlin](https://img.shields.io/badge/kotlin-2.1.20-7f52ff)](https://kotlinlang.org/)
+[![Kotlin](https://img.shields.io/badge/kotlin-2.1.21-7f52ff)](https://kotlinlang.org/)
 [![bld](https://img.shields.io/badge/2.2.1-FA9052?label=bld&labelColor=2392FF)](https://rife2.com/bld)
 [![Release](https://img.shields.io/github/release/ethauvin/bitly-shorten.svg)](https://github.com/ethauvin/bitly-shorten/releases/latest)
 [![Maven Central](https://img.shields.io/maven-central/v/net.thauvin.erik/bitly-shorten.svg?color=blue)](https://central.sonatype.com/artifact/net.thauvin.erik/bitly-shorten)
diff --git a/examples/gradle/.idea/kotlinc.xml b/examples/gradle/.idea/kotlinc.xml
index 6d0ee1c..750533e 100644
--- a/examples/gradle/.idea/kotlinc.xml
+++ b/examples/gradle/.idea/kotlinc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="KotlinJpsPluginSettings">
-    <option name="version" value="2.0.0" />
+    <option name="version" value="2.1.21" />
   </component>
-</project>
\ No newline at end of file
+</project>
diff --git a/examples/gradle/build.gradle.kts b/examples/gradle/build.gradle.kts
index e265ddb..cf9405b 100644
--- a/examples/gradle/build.gradle.kts
+++ b/examples/gradle/build.gradle.kts
@@ -1,7 +1,7 @@
 plugins {
     id("application")
     id("com.github.ben-manes.versions") version "0.51.0"
-    kotlin("jvm") version "2.1.20"
+    kotlin("jvm") version "2.1.21"
 }
 
 repositories {