diff --git a/.github/workflows/activation2020.yml b/.github/workflows/activation2020.yml
deleted file mode 100644
index 78b15ce2..00000000
--- a/.github/workflows/activation2020.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-name: Acquire activation file for 2020
-
-on:
-  workflow_dispatch: {}
-
-jobs:
-  activation:
-    name: Request manual activation file 🔑
-    runs-on: ubuntu-latest
-    steps:
-      # Request manual activation file
-      - name: Request manual activation file
-        id: getManualLicenseFile
-        uses: game-ci/unity-request-activation-file@v2.2.0
-        with:
-          unityVersion: 2020.3.48f1
-      # Upload artifact (Unity_v20XX.X.XXXX.alf)
-      - name: Expose as artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: ${{ steps.getManualLicenseFile.outputs.filePath }}
-          path: ${{ steps.getManualLicenseFile.outputs.filePath }}
diff --git a/.github/workflows/activation2021.yml b/.github/workflows/activation2021.yml
deleted file mode 100644
index f2392c4a..00000000
--- a/.github/workflows/activation2021.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-name: Acquire activation file for 2021
-
-on:
-  workflow_dispatch: {}
-
-jobs:
-  activation:
-    name: Request manual activation file 🔑
-    runs-on: ubuntu-latest
-    steps:
-      # Request manual activation file
-      - name: Request manual activation file
-        id: getManualLicenseFile
-        uses: game-ci/unity-activate@v2
-        with:
-          unityVersion: 2021.3.42f1
-      # Upload artifact (Unity_v20XX.X.XXXX.alf)
-      - name: Expose as artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: ${{ steps.getManualLicenseFile.outputs.filePath }}
-          path: ${{ steps.getManualLicenseFile.outputs.filePath }}
diff --git a/.github/workflows/activation2022.yml b/.github/workflows/activation2022.yml
deleted file mode 100644
index 37a8f645..00000000
--- a/.github/workflows/activation2022.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-name: Acquire activation file for 2022
-
-on:
-  workflow_dispatch: {}
-
-jobs:
-  activation:
-    name: Request manual activation file 🔑
-    runs-on: ubuntu-latest
-    steps:
-      # Request manual activation file
-      - name: Request manual activation file
-        id: getManualLicenseFile
-        uses: game-ci/unity-acrivate@v2
-        with:
-          unityVersion: 2022.3.42f1
-      # Upload artifact (Unity_v20XX.X.XXXX.alf)
-      - name: Expose as artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: ${{ steps.getManualLicenseFile.outputs.filePath }}
-          path: ${{ steps.getManualLicenseFile.outputs.filePath }}
diff --git a/.github/workflows/activation_all.yml b/.github/workflows/activation_all.yml
deleted file mode 100644
index 3b9cb9d1..00000000
--- a/.github/workflows/activation_all.yml
+++ /dev/null
@@ -1,28 +0,0 @@
-name: Acquire activation files
-on:
-  workflow_dispatch: {}
-
-jobs:
-  activation:
-    name: Request manual activation files for multiple Unity versions 🔑
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        unityVersion:
-          - 2020.3.48f1
-          - 2021.3.42f1
-          - 2022.3.42f1
-    steps:
-      # GameCI の Activation を利用して alf ファイルを発行する
-      - name: Request manual activation file for Unity ${{ matrix.unityVersion }}
-        id: getManualLicenseFile
-        uses: game-ci/unity-request-activation-file@v2
-        with:
-          unityVersion: ${{ matrix.unityVersion }}
-
-      # アーティファクトのアップロード (Unity_v20XX.X.XXXX.alf)
-      - name: Expose artifact for Unity ${{ matrix.unityVersion }}
-        uses: actions/upload-artifact@v4
-        with:
-          name: Unity_${{ matrix.unityVersion }}_activation_file
-          path: ${{ steps.getManualLicenseFile.outputs.filePath }}