diff --git a/.drone.yml b/.drone.yml
deleted file mode 100644
index e728ab0b..00000000
--- a/.drone.yml
+++ /dev/null
@@ -1,66 +0,0 @@
----
-kind: pipeline
-name: default
-
-steps:
-- name: test
-  image: python:3.7
-  commands:
-  - pip install yapf
-  - yapf . -rd
-  - pip install -r requirements.txt
-  - pip install -r tests/requirements.txt
-  - pytest
-
-trigger:
-  branch:
-    exclude:
-    - master
-    - develop
----
-kind: pipeline
-type: ssh
-name: dev-deploy
-
-server:
-  host: s2.noj.tw
-  user: development
-  ssh_key:
-    from_secret: dev-ssh_key
-
-steps:
-- name: deploy
-  commands:
-  - cd /home/development/Normal-OJ/Back-End
-  - git pull
-  - docker-compose up --build --no-start web
-  - docker-compose restart web
-
-trigger:
-  event:
-  - push
-  branch:
-  - develop
----
-kind: pipeline
-type: ssh
-name: prod-deploy
-
-server:
-  host: noj.tw
-  user: development
-  ssh_key:
-    from_secret: prod-ssh_key
-
-steps:
-- name: deploy
-  commands:
-  - cd /home/development/Normal-OJ/Back-End
-  - git pull
-  - docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d --build web
-
-trigger:
-  event:
-  - push
-  branch:
-  - master
\ No newline at end of file
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
deleted file mode 100644
index d0382479..00000000
--- a/.github/CODEOWNERS
+++ /dev/null
@@ -1,3 +0,0 @@
-*   @AlaRduTP
-*   @skps2010
-*   @as535364
diff --git a/.github/workflows/continuous-integration-workflow.yml b/.github/workflows/continuous-integration-workflow.yml
deleted file mode 100644
index adb7803c..00000000
--- a/.github/workflows/continuous-integration-workflow.yml
+++ /dev/null
@@ -1,30 +0,0 @@
-name: CI
-
-on: [push, pull_request]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: Set up Python 3.8
-      uses: actions/setup-python@v1
-      with:
-        python-version: 3.8
-    - name: Upgrade pip
-      run: |
-        python -m pip install --upgrade pip
-    - name: Install dev dependencies
-      run: |
-        pip install -r requirements/dev.txt
-    # - name: Install bs detection requirements
-    #   run: |
-    #     sudo apt install cppcheck
-    - name: YAPF
-      run: |
-        yapf . -rd
-    - name: Unit test
-      run: |
-        pytest
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 00000000..2c65c49d
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,11 @@
+stages:
+  - test
+
+test:
+  stage: test
+  image: python:3.8-buster
+  script:
+    - pip install --upgrade pip
+    - pip install -r requirements/dev.txt
+    - yapf . -r
+    - pytest
diff --git a/README.md b/README.md
index 90002ca3..5af12b68 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1 @@
-# Back-End
-
-## API Reference
-
-https://normal-oj.github.io/Back-End
+# Normal OJ Backend