diff --git a/build.gradle.kts b/build.gradle.kts
index 2024bb77..07b72860 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,5 +1,5 @@
 plugins {
-    kotlin("jvm") version "2.2.0"
+    kotlin("jvm") version "2.1.21"
     jacoco
     id("org.sonarqube") version "6.2.0.5505"
     id("com.diffplug.spotless") version "7.0.4"
@@ -14,7 +14,7 @@ repositories {
 }
 
 dependencies {
-    implementation("org.jetbrains.kotlin:kotlin-stdlib:2.2.0")
+    implementation("org.jetbrains.kotlin:kotlin-stdlib:2.1.21")
     testImplementation("org.junit.jupiter:junit-jupiter:[5.13.2,)")
     testImplementation("org.hamcrest:hamcrest-core:[3.0,)")
     testImplementation("org.zapodot:embedded-db-junit-jupiter:2.2.2")
diff --git a/pom-central.xml b/pom-central.xml
index 56df3381..7113daa9 100644
--- a/pom-central.xml
+++ b/pom-central.xml
@@ -27,7 +27,7 @@
         <url>https://github.com/javadev/LeetCode-in-Kotlin</url>
     </scm>
     <properties>
-        <kotlin.version>2.2.0</kotlin.version>
+        <kotlin.version>2.1.21</kotlin.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
     <ciManagement>
diff --git a/pom.xml b/pom.xml
index 9b6bc609..b531a5ab 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
         <url>https://github.com/javadev/LeetCode-in-Kotlin</url>
     </scm>
     <properties>
-        <kotlin.version>2.2.0</kotlin.version>
+        <kotlin.version>2.1.21</kotlin.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
     <ciManagement>