diff --git a/.github/workflows/stack.yml b/.github/workflows/stack.yml
index be31563..32263ad 100644
--- a/.github/workflows/stack.yml
+++ b/.github/workflows/stack.yml
@@ -23,15 +23,10 @@ jobs:
       - name: Clone project
         uses: actions/checkout@v3
 
-      - name: Prepare apt sources
-        run: |
-          set -ex
-          sudo add-apt-repository -y ppa:hvr/ghc
-          sudo apt update -y
-
       - name: Install C dependencies
         run: |
           set -ex
+          sudo apt update -y
           sudo apt install -y \
             libx11-dev \
             libxext-dev \