diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..b70ec8a
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,37 @@
+name: PyTest
+
+on:
+  push:
+    branches:
+      - main
+      - "*/ci-check"
+  pull_request: {}
+
+jobs:
+  test:
+    name: PyTest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-latest]
+        python: [3.8, "3.10", 3.11, 3.12]
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+      with:
+        repository: interscript/interscript
+    - name: Run bootstrap script
+      run: ruby bootstrap.rb
+    - name: Use Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: "3.2"
+    - name: Use Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python }}
+    - name: Compile maps
+      run: cd python; pip install regex pytest; bash ./build.sh; pip install .
+    - name: PyTest
+      run: cd python; pytest
diff --git a/README.adoc b/README.adoc
index 70444fb..0539266 100644
--- a/README.adoc
+++ b/README.adoc
@@ -48,6 +48,7 @@ Interscript implementation. Those maps are compiled to respective `.py` files in
 
 [source,shell]
 ---
+$ pip install regex pytest
 $ ./build.sh
 $ pip install -e .
 $ pytest
@@ -57,6 +58,7 @@ $ pytest
 
 [source,shell]
 ---
+$ pip install regex pytest
 $ ./build.sh
 $ python -m build
 ---
diff --git a/build.sh b/build.sh
index 16db1c7..f066bc9 100755
--- a/build.sh
+++ b/build.sh
@@ -1,8 +1,9 @@
-#!/bin/sh
+#!/bin/bash
 
 rm -rf src/interscript/maps
 mkdir -p src/interscript/maps
 pushd ../ruby
+bundle config set --local without 'secryst'
 bundle install || exit 1
 bundle exec rake compile[python,../python/src/interscript/maps] || exit 1
 popd