diff --git a/.github/workflows/arm64-build-checks.yml b/.github/workflows/arm64-build-checks.yml
deleted file mode 100644
index e0d374ea77..0000000000
--- a/.github/workflows/arm64-build-checks.yml
+++ /dev/null
@@ -1,50 +0,0 @@
-name: arm64 build checks
-
-on: workflow_dispatch
-
-permissions:
-  contents: read # to fetch code (actions/checkout)
-
-jobs:
-  build:
-
-    runs-on: ubuntu-18.04
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Install dependency packages
-      run: |
-        sudo sed -i -E 's|^deb ([^ ]+) (.*)$|deb [arch=amd64] \1 \2\ndeb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ \2|' /etc/apt/sources.list
-        sudo dpkg --add-architecture arm64
-        sudo apt-get update
-        sudo apt-get install -y --no-install-recommends \
-                crossbuild-essential-arm64 \
-                git \
-                cmake \
-                libpython-dev:arm64 \
-                libpython3-dev:arm64 \
-                python-numpy \
-                python3-numpy
-
-    - name: Fetch opencv_contrib
-      run: |
-        git clone --depth 1 https://github.com/opencv/opencv_contrib.git ../opencv_contrib
-
-    - name: Configure
-      run: |
-        mkdir build
-        cd build
-        cmake -DPYTHON2_INCLUDE_PATH=/usr/include/python2.7/ \
-              -DPYTHON2_LIBRARIES=/usr/lib/aarch64-linux-gnu/libpython2.7.so \
-              -DPYTHON2_NUMPY_INCLUDE_DIRS=/usr/lib/python2.7/dist-packages/numpy/core/include \
-              -DPYTHON3_INCLUDE_PATH=/usr/include/python3.6m/ \
-              -DPYTHON3_LIBRARIES=/usr/lib/aarch64-linux-gnu/libpython3.6m.so \
-              -DPYTHON3_NUMPY_INCLUDE_DIRS=/usr/lib/python3/dist-packages/numpy/core/include \
-              -DCMAKE_TOOLCHAIN_FILE=../platforms/linux/aarch64-gnu.toolchain.cmake \
-              -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
-              ../
-
-    - name: Build
-      run: |
-        cd build
-        make -j$(nproc --all)
diff --git a/.github/workflows/lint_python.yml b/.github/workflows/lint_python.yml
deleted file mode 100644
index b21191934c..0000000000
--- a/.github/workflows/lint_python.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-name: lint_python
-on: workflow_dispatch
-permissions:
-  contents: read # to fetch code (actions/checkout)
-jobs:
-  lint_python:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
-      - run: pip install --upgrade pip wheel
-      - run: pip install bandit black codespell flake8 flake8-2020 flake8-bugbear
-                         flake8-comprehensions isort mypy pytest pyupgrade safety
-      - run: bandit --recursive --skip B101 . || true  # B101 is assert statements
-      - run: black --check . || true
-      - run: codespell || true  # --ignore-words-list="" --skip="*.css,*.js,*.lock"
-      - run: flake8 . --count --select=E9,F63,F7 --show-source --statistics
-      - run: flake8 . --count --exit-zero --max-complexity=10 --max-line-length=88
-                      --show-source --statistics
-      - run: isort --check-only --profile black . || true
-      - run: pip install -r requirements.txt || pip install --editable . || true
-      - run: mkdir --parents --verbose .mypy_cache
-      - run: mypy --ignore-missing-imports --install-types --non-interactive . || true
-      - run: pytest . || true
-      - run: pytest --doctest-modules . || true
-      - run: shopt -s globstar && pyupgrade --py36-plus **/*.py || true
-      - run: safety check