diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..9ff5ee6
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,46 @@
+name: CI Template
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  verify:
+    if: ${{ false }}
+    name: ${{ matrix.project }}
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        project:
+          - template/spring-boot-kotlin
+          - template/spring-boot-kotlin-multi-module
+
+    env:
+      SPOTLESS_RATCHET_FROM: ${{ github.event.pull_request.base.sha }}
+
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-java@v6
+        with:
+          distribution: temurin
+          java-version: "25"
+
+      - uses: gradle/actions/setup-gradle@v6
+
+      - name: Spotless Check
+        working-directory: ${{ matrix.project }}
+        run: ./gradlew spotlessCheck
+
+      - name: Gradle Test
+        working-directory: ${{ matrix.project }}
+        run: ./gradlew test
+
+      - name: Gradle Build
+        working-directory: ${{ matrix.project }}
+        run: ./gradlew build
diff --git a/AGENTS.md b/AGENTS.md
index e41d2c0..73e2e13 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -80,11 +80,13 @@ kotlin scripts/git/git-workflow.main.kts finish TASK_ID
 - [Must] `spotlessApply`, `test`, `build` 순으로 실행해야 합니다. `check`는 별도로 실행하지 않습니다.
 
 ```sh
-./gradlew spotlessApply # 전체 파일에 기계적 포맷을 적용합니다.
+./gradlew spotlessApply # HEAD 이후 변경된 파일에 기계적 포맷을 적용합니다.
 ./gradlew test --tests "com.example.mypackage.*" # Task 범위의 패키지 테스트를 실행합니다.
 ./gradlew build # clean 없이 증분 빌드를 실행합니다.
 ```
 
+Spotless의 기준 Git ref는 `-PspotlessRatchetFrom` 또는 `SPOTLESS_RATCHET_FROM`으로 지정합니다. 둘 다 지정하지 않으면 `HEAD`를 사용합니다. PR CI에서는 병합 대상 브랜치의 base SHA를 `SPOTLESS_RATCHET_FROM`으로 전달해 `spotlessCheck`를 실행합니다.
+
 # 주요 디렉터리
 
 아직 작성하지 않았습니다.
diff --git a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-application/build.gradle.kts b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-application/build.gradle.kts
index e4a89dc..60c8bb5 100644
--- a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-application/build.gradle.kts
+++ b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-application/build.gradle.kts
@@ -6,7 +6,7 @@ plugins {
 
 java {
   toolchain {
-    languageVersion = JavaLanguageVersion.of(21)
+    languageVersion = JavaLanguageVersion.of(24)
   }
 }
 
diff --git a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-batch/build.gradle.kts b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-batch/build.gradle.kts
index 6905934..48a66ca 100644
--- a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-batch/build.gradle.kts
+++ b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-batch/build.gradle.kts
@@ -11,7 +11,7 @@ base {
 
 java {
   toolchain {
-    languageVersion = JavaLanguageVersion.of(21)
+    languageVersion = JavaLanguageVersion.of(24)
   }
 }
 
diff --git a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-domain/build.gradle.kts b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-domain/build.gradle.kts
index 09ec1b7..1a3da6e 100644
--- a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-domain/build.gradle.kts
+++ b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-domain/build.gradle.kts
@@ -5,7 +5,7 @@ plugins {
 
 java {
   toolchain {
-    languageVersion = JavaLanguageVersion.of(21)
+    languageVersion = JavaLanguageVersion.of(24)
   }
 }
 
diff --git a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-infrastructure/build.gradle.kts b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-infrastructure/build.gradle.kts
index 497046f..671a7d9 100644
--- a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-infrastructure/build.gradle.kts
+++ b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-infrastructure/build.gradle.kts
@@ -5,7 +5,7 @@ plugins {
 
 java {
   toolchain {
-    languageVersion = JavaLanguageVersion.of(21)
+    languageVersion = JavaLanguageVersion.of(24)
   }
 }
 
diff --git a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-presentation/build.gradle.kts b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-presentation/build.gradle.kts
index 5f22732..5751d83 100644
--- a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-presentation/build.gradle.kts
+++ b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-presentation/build.gradle.kts
@@ -12,7 +12,7 @@ base {
 
 java {
   toolchain {
-    languageVersion = JavaLanguageVersion.of(21)
+    languageVersion = JavaLanguageVersion.of(24)
   }
 }
 
diff --git a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-worker/build.gradle.kts b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-worker/build.gradle.kts
index be3180a..6023c9c 100644
--- a/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-worker/build.gradle.kts
+++ b/template/spring-boot-kotlin-multi-module/__SPRINGKIT_ARTIFACT__-worker/build.gradle.kts
@@ -11,7 +11,7 @@ base {
 
 java {
   toolchain {
-    languageVersion = JavaLanguageVersion.of(21)
+    languageVersion = JavaLanguageVersion.of(24)
   }
 }
 
diff --git a/template/spring-boot-kotlin-multi-module/build.gradle.kts b/template/spring-boot-kotlin-multi-module/build.gradle.kts
index 8950d85..efe2920 100644
--- a/template/spring-boot-kotlin-multi-module/build.gradle.kts
+++ b/template/spring-boot-kotlin-multi-module/build.gradle.kts
@@ -1,14 +1,21 @@
 plugins {
-  kotlin("jvm") version "2.3.21" apply false
-  kotlin("plugin.spring") version "2.3.21" apply false
+  kotlin("jvm") version "2.2.21" apply false
+  kotlin("plugin.spring") version "2.2.21" apply false
   id("org.springframework.boot") version "4.1.1" apply false
   id("io.spring.dependency-management") version "1.1.7" apply false
   id("com.epages.restdocs-api-spec") version "0.20.1" apply false
   id("com.diffplug.spotless") version "8.10.2"
 }
 
+val spotlessRatchetFrom =
+    providers
+        .gradleProperty("spotlessRatchetFrom")
+        .orElse(providers.environmentVariable("SPOTLESS_RATCHET_FROM"))
+        .getOrElse("HEAD")
+
 spotless {
   isEnforceCheck = false
+  ratchetFrom(spotlessRatchetFrom)
 
   kotlinGradle {
     target("**/*.gradle.kts")
@@ -32,6 +39,7 @@ subprojects {
 
   configure<com.diffplug.gradle.spotless.SpotlessExtension> {
     isEnforceCheck = false
+    ratchetFrom(spotlessRatchetFrom)
 
     kotlin {
       target("src/*/kotlin/**/*.kt")
diff --git a/template/spring-boot-kotlin-multi-module/declarative-rest-docs/build.gradle.kts b/template/spring-boot-kotlin-multi-module/declarative-rest-docs/build.gradle.kts
index 9b6bcce..945bd44 100644
--- a/template/spring-boot-kotlin-multi-module/declarative-rest-docs/build.gradle.kts
+++ b/template/spring-boot-kotlin-multi-module/declarative-rest-docs/build.gradle.kts
@@ -11,7 +11,7 @@ base {
 
 java {
   toolchain {
-    languageVersion = JavaLanguageVersion.of(21)
+    languageVersion = JavaLanguageVersion.of(24)
   }
 }
 
diff --git a/template/spring-boot-kotlin/build.gradle.kts b/template/spring-boot-kotlin/build.gradle.kts
index 82aa5e2..9847884 100644
--- a/template/spring-boot-kotlin/build.gradle.kts
+++ b/template/spring-boot-kotlin/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
-  kotlin("jvm") version "2.3.21"
-  kotlin("plugin.spring") version "2.3.21"
+  kotlin("jvm") version "2.2.21"
+  kotlin("plugin.spring") version "2.2.21"
   id("org.springframework.boot") version "4.1.1"
   id("io.spring.dependency-management") version "1.1.7"
   id("com.diffplug.spotless") version "8.10.2"
@@ -16,7 +16,7 @@ base {
 
 java {
   toolchain {
-    languageVersion = JavaLanguageVersion.of(21)
+    languageVersion = JavaLanguageVersion.of(24)
   }
 }
 
@@ -24,8 +24,15 @@ repositories {
   mavenCentral()
 }
 
+val spotlessRatchetFrom =
+    providers
+        .gradleProperty("spotlessRatchetFrom")
+        .orElse(providers.environmentVariable("SPOTLESS_RATCHET_FROM"))
+        .getOrElse("HEAD")
+
 spotless {
   isEnforceCheck = false
+  ratchetFrom(spotlessRatchetFrom)
 
   kotlin {
     target("src/*/kotlin/**/*.kt")