diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 8b26882..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-version: 2
-jobs:
-  test_debug:
-    docker:
-      - image: tschijnmo/drudge:base
-    steps:
-      - run: |
-          git clone --recurse-submodules https://github.com/tschijnmo/cpypp.git
-          mkdir cmake-test-debug
-          cd cmake-test-debug
-          cmake -DCMAKE_BUILD_TYPE=debug ../cpypp
-          make
-          ./test/testmain
-
-  test_release:
-    docker:
-      - image: tschijnmo/drudge:base
-    steps:
-      - run: |
-          git clone --recurse-submodules https://github.com/tschijnmo/cpypp.git
-          mkdir cmake-test-release
-          cd cmake-test-release
-          cmake -DCMAKE_BUILD_TYPE=release ../cpypp
-          make
-          ./test/testmain
-
-workflows:
-  version: 2
-  tests:
-    jobs:
-      - test_debug
-      - test_release
-
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..13d76ea
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,54 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+      - 'release/*'
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  test_debug:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    container:
+      image: tschijnmo/drudge:base
+    
+    steps:
+      - name: Checkout repository with submodules
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      
+      - name: Build and test (debug)
+        run: |
+          mkdir cmake-test-debug
+          cd cmake-test-debug
+          cmake -DCMAKE_BUILD_TYPE=debug ..
+          make
+          ./test/testmain
+
+  test_release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    container:
+      image: tschijnmo/drudge:base
+    
+    steps:
+      - name: Checkout repository with submodules
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      
+      - name: Build and test (release)
+        run: |
+          mkdir cmake-test-release
+          cd cmake-test-release
+          cmake -DCMAKE_BUILD_TYPE=release ..
+          make
+          ./test/testmain
diff --git a/.ycm_extra_conf.py b/.ycm_extra_conf.py
deleted file mode 100644
index 4867739..0000000
--- a/.ycm_extra_conf.py
+++ /dev/null
@@ -1,18 +0,0 @@
-import os.path
-import subprocess
-
-def FlagsForFile(filename, **kwargs):
-    flags = ['-std=c++14', '-I/usr/local/include', '-I.']
-
-    # Call the config script to get the directories for the Python3 interpreter
-    # in PATH.
-    py_includes = subprocess.check_output(
-        ['python3-config', '--includes']
-    ).decode('utf-8').split()
-    flags.extend(py_includes)
-
-    proj_dir = os.path.dirname(os.path.realpath(__file__))
-    proj_include = os.path.join(proj_dir, 'include')
-    flags.append('-I' + proj_include)
-
-    return {'flags': flags}
diff --git a/README.md b/README.md
index bbb898b..403301a 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![Build Status](https://circleci.com/gh/tschijnmo/cpypp.svg?style=shield)](https://circleci.com/gh/tschijnmo/cpypp)
+[![CI](https://github.com/DrudgeCAS/cpypp/actions/workflows/ci.yml/badge.svg)](https://github.com/DrudgeCAS/cpypp/actions/workflows/ci.yml)
 
 # cpypp