diff --git a/.github/workflows/pcu.yml b/.github/workflows/pcu.yml
deleted file mode 100644
index 665f991..0000000
--- a/.github/workflows/pcu.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-name: pcu
-on:
-  push:
-    branches: [main]
-  schedule:
-    - cron: "0 12 * * 1"
-jobs:
-  refreshDeps:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: zehengl/refresh-python-dependency@main
-        with:
-          path: requirements-dev.txt
diff --git a/README.md b/README.md
index e57940f..d9c1aae 100644
--- a/README.md
+++ b/README.md
@@ -17,14 +17,6 @@ A Python tutorial for beginners, powered by VuePress and deployed at
     npm install
     npm start
 
-### Development
-
-Also install `black` to auto format Python code snippets.
-
-    python -m venv .venv
-    source .venv/bin/activate
-    pip install -r requirements-dev.txt
-
 ## Credits
 
 - [Logo][1] by [Flatart][2]
diff --git a/requirements-dev.txt b/requirements-dev.txt
deleted file mode 100644
index 0eb819f..0000000
--- a/requirements-dev.txt
+++ /dev/null
@@ -1 +0,0 @@
-pip-check-updates==0.22.0