diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c1ca31e..691d723 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,7 +5,14 @@ test:
   script:
   - apt-get update -qy
   - apt-get install -y --no-install-recommends python3-dev python3-pip python3-coverage python3-setuptools build-essential
-  - pip3 install wheel
   - pip3 install -r requirements.txt
   - python3-coverage run --branch -m unittest discover matemat
   - python3-coverage report -m --include 'matemat/*' --omit '*/test_*.py'
+
+codestyle:
+  script:
+  - apt-get update -qy
+  - apt-get install -y --no-install-recommends python3-dev python3-pip python3-coverage python3-setuptools build-essential
+  - pip3 install -r requirements.txt
+  - pip3 install pycodestyle
+  - pycodestyle matemat
diff --git a/requirements.txt b/requirements.txt
index f2fa21b..4564678 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
+wheel
 bcrypt
 apsw