diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aacbff90..8ca2bcc0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,7 @@ jobs:
   gcc:
     name: GCC
     needs: lint
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
@@ -51,7 +51,6 @@ jobs:
           sudo add-apt-repository -yn 'deb http://archive.ubuntu.com/ubuntu/ xenial universe'
           sudo add-apt-repository -yn 'deb http://archive.ubuntu.com/ubuntu/ bionic main'
           sudo add-apt-repository -yn 'deb http://archive.ubuntu.com/ubuntu/ bionic universe'
-          sudo add-apt-repository -yn 'deb http://mirrors.kernel.org/ubuntu hirsute main universe'
           sudo apt-get update
           sudo apt-get install -y gcc-${{ matrix.gcc }} g++-${{ matrix.gcc }}
       - name: Checkout