diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 791efd5..e9bb17b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -40,6 +40,9 @@ jobs:
       - name: "Install python dependencies"
         run: |
           pip install ".[dev,ci]"
+      - name: "Run type checking"
+        run: |
+          mypy python --disable-error-code import --disable-error-code no-redef --disable-error-code assignment
       - name: "Run tests"
         run: |
           coverage run -m unittest -v
diff --git a/pyproject.toml b/pyproject.toml
index 3b514cc..ea15bd8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,11 +25,13 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "coverage>=6.2",
+    "mypy>=1.4.1",
     "pytest>=6.2.5",
     "pytest-cov>=3.0.0",
     "trio>=0.19.0",
 ]
 ci = [
+    "mypy==1.4.1",
     "pycryptodome==3.10.1",
     "stream-inflate==0.0.12",
 ]