diff --git a/common/build.gradle.kts b/common/build.gradle.kts
index cf2f176..995a8fe 100644
--- a/common/build.gradle.kts
+++ b/common/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     id("java-library")
-    kotlin("jvm") version "2.0.10"
+    kotlin("jvm") version "2.0.20"
     id("org.jetbrains.dokka")
     id("maven-publish")
     id("signing")
diff --git a/packet/build.gradle.kts b/packet/build.gradle.kts
index 0700613..26084c6 100644
--- a/packet/build.gradle.kts
+++ b/packet/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     id("java-library")
-    kotlin("jvm") version "2.0.10"
+    kotlin("jvm") version "2.0.20"
     id("org.jetbrains.dokka")
     id("maven-publish")
     id("signing")
diff --git a/sample/build.gradle.kts b/sample/build.gradle.kts
index 4a17a64..5311bc9 100644
--- a/sample/build.gradle.kts
+++ b/sample/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     id("java-library")
-    kotlin("jvm") version "2.0.10"
+    kotlin("jvm") version "2.0.20"
 }
 
 group = "dev.keiji.openpgp"
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 67a6b78..3e9e5e8 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -1,6 +1,6 @@
 pluginManagement {
     plugins {
-        kotlin("jvm") version "2.0.10"
+        kotlin("jvm") version "2.0.20"
         id("org.jetbrains.dokka") version "1.9.20"
         id("io.gitlab.arturbosch.detekt") version "1.23.6"
     }
diff --git a/signature-ext/build.gradle.kts b/signature-ext/build.gradle.kts
index 8c1a941..86981d4 100644
--- a/signature-ext/build.gradle.kts
+++ b/signature-ext/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     id("java-library")
-    kotlin("jvm") version "2.0.10"
+    kotlin("jvm") version "2.0.20"
     id("org.jetbrains.dokka")
     id("maven-publish")
     id("signing")