diff --git a/.github/workflows/bld.yml b/.github/workflows/bld.yml
index f518c42..be80a2f 100644
--- a/.github/workflows/bld.yml
+++ b/.github/workflows/bld.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         java-version: [17, 21, 24]
-        kotlin-version: [1.9.25, 2.1.10]
+        kotlin-version: [1.9.25, 2.1.20]
 
     steps:
       - name: Checkout source repository
diff --git a/.idea/app.iml b/.idea/app.iml
index a350d1f..381e063 100644
--- a/.idea/app.iml
+++ b/.idea/app.iml
@@ -5,10 +5,6 @@
     <output-test url="file://$MODULE_DIR$/build/test" />
     <exclude-output />
     <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" relativeOutputPath="resources" />
-      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
-      <sourceFolder url="file://$MODULE_DIR$/src/test/resources" type="java-test-resource" />
       <sourceFolder url="file://$MODULE_DIR$/src/main/kotlin/net/thauvin/erik/akismet" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/test/kotlin/net/thauvin/erik/akismet" isTestSource="true" />
     </content>
diff --git a/README.md b/README.md
index 309209f..441e433 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-2.1.10-7f52ff)](https://kotlinlang.org/)
+[![Kotlin](https://img.shields.io/badge/kotlin-2.1.20-7f52ff)](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/akismet-kotlin.svg)](https://github.com/ethauvin/akismet-kotlin/releases/latest)
 [![Nexus Snapshot](https://img.shields.io/nexus/s/net.thauvin.erik/akismet-kotlin?label=snapshot&server=https%3A%2F%2Foss.sonatype.org%2F)](https://oss.sonatype.org/content/repositories/snapshots/net/thauvin/erik/akismet-kotlin/)
diff --git a/examples/gradle/build.gradle.kts b/examples/gradle/build.gradle.kts
index 927fc12..1d9e3ef 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 "2.1.10"
+    kotlin("jvm") version "2.1.20"
 }
 
 defaultTasks(ApplicationPlugin.TASK_RUN_NAME)
diff --git a/pom.xml b/pom.xml
index ff558a4..33a7c4f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,19 +18,19 @@
     <dependency>
       <groupId>org.jetbrains.kotlin</groupId>
       <artifactId>kotlin-stdlib</artifactId>
-      <version>2.1.10</version>
+      <version>2.1.20</version>
       <scope>compile</scope>
     </dependency>
     <dependency>
       <groupId>org.jetbrains.kotlin</groupId>
       <artifactId>kotlin-stdlib-jdk7</artifactId>
-      <version>2.1.10</version>
+      <version>2.1.20</version>
       <scope>compile</scope>
     </dependency>
     <dependency>
       <groupId>org.jetbrains.kotlin</groupId>
       <artifactId>kotlin-stdlib-jdk8</artifactId>
-      <version>2.1.10</version>
+      <version>2.1.20</version>
       <scope>compile</scope>
     </dependency>
     <dependency>
diff --git a/src/bld/java/net/thauvin/erik/AkismetBuild.java b/src/bld/java/net/thauvin/erik/AkismetBuild.java
index 47f1629..cf33c53 100644
--- a/src/bld/java/net/thauvin/erik/AkismetBuild.java
+++ b/src/bld/java/net/thauvin/erik/AkismetBuild.java
@@ -71,14 +71,14 @@ public class AkismetBuild extends Project {
         repositories = List.of(MAVEN_LOCAL, MAVEN_CENTRAL);
 
         var okHttp = version(4, 12, 0);
-        final var kotlin = version(2, 1, 10);
+        final var kotlin = version(2, 1, 20);
         scope(compile)
                 .include(dependency("org.jetbrains.kotlin", "kotlin-stdlib", kotlin))
                 .include(dependency("org.jetbrains.kotlin", "kotlin-stdlib-jdk7", kotlin))
                 .include(dependency("org.jetbrains.kotlin", "kotlin-stdlib-jdk8", kotlin))
                 .include(dependency("com.squareup.okhttp3", "okhttp", okHttp))
                 .include(dependency("com.squareup.okhttp3", "logging-interceptor", okHttp))
-                .include(dependency("org.jetbrains.kotlinx", "kotlinx-serialization-json", version(1, 8, 0)));
+                .include(dependency("org.jetbrains.kotlinx", "kotlinx-serialization-json", "1.8.0"));
         scope(provided)
                 .include(dependency("jakarta.servlet", "jakarta.servlet-api", version(6, 1, 0)));
         scope(test)