diff --git a/.github/workflows/cupcake.yml b/.github/workflows/cupcake.yml
index 35c01e8..46f7e42 100644
--- a/.github/workflows/cupcake.yml
+++ b/.github/workflows/cupcake.yml
@@ -2,6 +2,7 @@ name: nix
 on:
   pull_request:
   push:
+    branches:
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
@@ -107,13 +108,18 @@ jobs:
           cmake-version: ${{ matrix.cmake }}
       - name: install Ninja on Linux
         if: matrix.generator == 'Ninja' && startsWith(matrix.platform, 'ubuntu')
-        run: sudo apt install ninja-build
+        run: |
+          sudo apt update
+          sudo apt install ninja-build
       - name: install Ninja on macOS
         if: matrix.generator == 'Ninja' && startsWith(matrix.platform, 'macos')
         run: brew install ninja
       - name: install GCC on Linux
         if: matrix.compiler == 'gcc' && startsWith(matrix.platform, 'ubuntu')
-        run: sudo apt install gcc-13
+        run: |
+          sudo apt update
+          apt search gcc
+          sudo apt install gcc-13
       - name: install GCC on macOS
         if: matrix.compiler == 'gcc' && startsWith(matrix.platform, 'macos')
         run: brew install gcc@13