diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index aeb0f98..ca6e4e8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -24,7 +24,9 @@ jobs:
         submodules: true
 
     - name: install packages (linux)
-      run: sudo apt-get install ninja-build libsdl2-dev
+      run: |
+        sudo apt-get update
+        sudo apt-get install ninja-build libsdl2-dev
       if: matrix.os == 'ubuntu-latest'
 
     - name: install packages (macos)
diff --git a/.github/workflows/build_release.yml b/.github/workflows/build_release.yml
index 20a6883..fd29892 100644
--- a/.github/workflows/build_release.yml
+++ b/.github/workflows/build_release.yml
@@ -24,7 +24,9 @@ jobs:
         submodules: true
 
     - name: install packages (linux)
-      run: sudo apt-get install ninja-build libsdl2-dev
+      run: |
+        sudo apt-get update
+        sudo apt-get install ninja-build libsdl2-dev
       if: matrix.os == 'ubuntu-latest'
 
     - name: install packages (macos)