diff --git a/.github/workflows/markdown-lint.yml b/.github/workflows/markdown-lint.yml
new file mode 100644
index 0000000..781334b
--- /dev/null
+++ b/.github/workflows/markdown-lint.yml
@@ -0,0 +1,10 @@
+---
+name: markdown-lint
+on:
+  push:
+jobs:
+  markdown-lint:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@8410ad0602e1e429cee44a835ae9f77f654a6694
+      - uses: articulate/actions-markdownlint@v1
diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
new file mode 100644
index 0000000..27fbdea
--- /dev/null
+++ b/.github/workflows/shellcheck.yml
@@ -0,0 +1,15 @@
+---
+name: shellcheck
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+jobs:
+  shellcheck:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ludeeus/action-shellcheck@master
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..1234b05
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,15 @@
+name: test
+on:
+  push:
+  pull_request:
+jobs:
+  test:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./
+        with:
+          cmd: latexmk
+          path: .
+          opts: -pdf test
+          packages: ffcode fvextra catchfile xstring framed environ upquote
diff --git a/.github/workflows/up.yml b/.github/workflows/up.yml
new file mode 100644
index 0000000..2ac0432
--- /dev/null
+++ b/.github/workflows/up.yml
@@ -0,0 +1,25 @@
+---
+name: up
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - '*'
+jobs:
+  up:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: |-
+          git fetch --tags --force && \
+          latest=$(git tag --sort=creatordate | tail -1) && \
+          sed -E -i "s/bibcop-action@.+$/bibcop-action@${latest}/g" README.md
+      - uses: peter-evans/create-pull-request@v6
+        with:
+          branch: version-up
+          commit-message: 'new version in README'
+          delete-branch: true
+          title: 'New version in README'
+          assignees: yegor256
+          base: master
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0393a2b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+test.pdf
+test.aux
+test.dvi
+test.fdb_latexmk
+test.fls
+test.log
\ No newline at end of file
diff --git a/.rultor.yml b/.rultor.yml
new file mode 100644
index 0000000..6554106
--- /dev/null
+++ b/.rultor.yml
@@ -0,0 +1,11 @@
+docker:
+  image: yegor256/rultor-image:1.23.0
+merge:
+  script: |-
+    sudo docker build "$(pwd)"
+release:
+  pre: false
+  script: |-
+    [[ "${tag}" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] || exit -1
+    sed -i -e "s/^0.0.0/${tag}/" Dockerfile
+    sudo docker build "$(pwd)"
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..e58cecf
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,33 @@
+# MIT License
+#
+# Copyright (c) 2024 Yegor Bugayenko
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+FROM yegor256/rultor-image:1.23.1
+
+LABEL "repository"="https://github.com/yegor256/bibcop-action"
+LABEL "maintainer"="Yegor Bugayenko"
+
+RUN wget https://yegor256.github.io/bibcop/bibcop.pl /home/bibcop.pl
+
+WORKDIR /home
+COPY entry.sh /home
+
+ENTRYPOINT ["/home/entry.sh"]
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..0add847
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021-2024 Yegor Bugayenko
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..cc2f0cb
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,27 @@
+# MIT License
+#
+# Copyright (c) 2024 Yegor Bugayenko
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+test:
+	docker run --rm -v "$$(pwd):/w" $$(docker build -q .)
+
+clean:
+	rm -f *.dvi *.pdf *.fls *.aux *.fdb_latexmk *.log
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4f4db5c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,31 @@
+# Bibcop Github Action
+
+[![test](https://github.com/yegor256/bibcop-action/actions/workflows/test.yml/badge.svg)](https://github.com/yegor256/bibcop-action/actions/workflows/test.yml)
+[![License](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/yegor256/bibcop-action/blob/master/LICENSE.txt)
+
+Checks the quality of all `.bib` files in the repository,
+using [bibcop](https://github.com/yegor256/bibcop).
+
+```yaml
+name: bibcop
+on:
+  push:
+jobs:
+  bibcop:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@master
+      - uses: yegor256/bibcop-action@0.0.0
+```
+
+## How to Contribute
+
+In order to test this action, just run:
+
+```bash
+make test
+```
+
+This should build a new Docker image and then try to use it
+in order to render a simple `test.tex` document. You need to have
+[Docker](https://docs.docker.com/get-docker/) installed.
diff --git a/action.yml b/action.yml
new file mode 100644
index 0000000..23a2ff9
--- /dev/null
+++ b/action.yml
@@ -0,0 +1,35 @@
+# MIT License
+#
+# Copyright (c) 2021-2024 Yegor Bugayenko
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+---
+name: 'bibcop-action'
+description: 'Check the quality of .bib files'
+branding:
+  icon: alert-triangle
+  color: orange
+runs:
+  using: 'docker'
+  image: Dockerfile
+inputs:
+  opts:
+    description: 'Command-line options for bibcop'
+    required: false
+    default: ''
diff --git a/entry.sh b/entry.sh
new file mode 100755
index 0000000..0aed4f2
--- /dev/null
+++ b/entry.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+# MIT License
+#
+# Copyright (c) 2024 Yegor Bugayenko
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+set -x
+set -e
+set -o pipefail
+
+cd "${GITHUB_WORKSPACE-/w}"
+
+read -r -a opts <<< "${INPUT_OPTS}"
+
+chmod a+x /home/bibcop.pl
+find . -name '.bib' -exec /home/bibcop.pl "${opts[@]}" {} \;
diff --git a/renovate.json b/renovate.json
new file mode 100644
index 0000000..39a2b6e
--- /dev/null
+++ b/renovate.json
@@ -0,0 +1,6 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base"
+  ]
+}