diff --git a/.github/workflows/bld.yml b/.github/workflows/bld.yml
index 36e3f2b..64fbb4d 100644
--- a/.github/workflows/bld.yml
+++ b/.github/workflows/bld.yml
@@ -14,7 +14,7 @@ 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/README.md b/README.md
index 7ab62dc..d36883b 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/cryptoprice.svg)](https://github.com/ethauvin/cryptoprice/releases/latest)
 [![Maven Central](https://img.shields.io/maven-central/v/net.thauvin.erik/cryptoprice)](https://central.sonatype.com/artifact/net.thauvin.erik/cryptoprice)
diff --git a/examples/gradle/build.gradle.kts b/examples/gradle/build.gradle.kts
index aaff607..d1cd136 100644
--- a/examples/gradle/build.gradle.kts
+++ b/examples/gradle/build.gradle.kts
@@ -3,7 +3,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 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/src/bld/java/net/thauvin/erik/crypto/CryptoPriceBuild.java b/src/bld/java/net/thauvin/erik/crypto/CryptoPriceBuild.java
index 6de4a82..9af1105 100644
--- a/src/bld/java/net/thauvin/erik/crypto/CryptoPriceBuild.java
+++ b/src/bld/java/net/thauvin/erik/crypto/CryptoPriceBuild.java
@@ -69,7 +69,7 @@ public class CryptoPriceBuild extends Project {
         autoDownloadPurge = true;
         repositories = List.of(MAVEN_LOCAL, MAVEN_CENTRAL);
 
-        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.json", "json", "20250107"))