diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 2db2041..80bcd67 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -11,11 +11,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Set up JDK 17
+      - name: Set up JDK
         uses: actions/setup-java@v3
         with:
-          java-version: '17'
-          distribution: 'adopt'
+          distribution: temurin
+          java-version: 21
       - name: Validate Gradle wrapper
         uses: gradle/wrapper-validation-action@v1.0.6
       - name: Checkstyle
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index ed8f6fc..0c0bdd0 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -13,11 +13,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Set up JDK 17
+      - name: Set up JDK
         uses: actions/setup-java@v3
         with:
-          java-version: '17'
-          distribution: 'adopt'
+          distribution: temurin
+          java-version: 21
       - name: Validate Gradle wrapper
         uses: gradle/wrapper-validation-action@v1.0.6
       - name: Build sourcesJar and javadocJar
diff --git a/.github/workflows/repository-maintenance.yml b/.github/workflows/repository-maintenance.yml
index e29d079..8229b77 100644
--- a/.github/workflows/repository-maintenance.yml
+++ b/.github/workflows/repository-maintenance.yml
@@ -16,7 +16,7 @@ jobs:
         name: Setup Java
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
       - name: Generate and submit dependency graph
         uses: gradle/actions/dependency-submission@v4.1.0
         with:
diff --git a/build.gradle b/build.gradle
index 980e45b..a802ff1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,8 +3,6 @@ plugins {
     alias(libs.plugins.nexus.publish)
 }
 
-def javaVersion = providers.environmentVariable("JAVA_BUILD_VERSION").getOrElse("17")
-
 apply from: "${rootDir}/gradle/publish-root.gradle"
 
 allprojects {
@@ -14,7 +12,7 @@ allprojects {
 
     java {
         toolchain {
-            languageVersion = JavaLanguageVersion.of(javaVersion)
+            languageVersion = JavaLanguageVersion.of(libs.versions.java.get())
         }
     }
 
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 1ad3aa2..3d1ad51 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,4 +1,5 @@
 [versions]
+java = "21"
 spring-boot = "3.3.5"
 spring-dependency-management = "1.1.6"
 openapi-generator = "7.9.0"