diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9f5b548..1477a93 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -42,7 +42,9 @@ jobs:
 
     - name: Install apt dependencies
       run: |
+        sudo apt-get update
         sudo apt-get install -y libhdf5-serial-dev libopenmpi-dev openmpi-bin
+
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with:
@@ -76,6 +78,7 @@ jobs:
 
     - name: Install apt dependencies
       run: |
+        sudo apt-get update
         sudo apt-get install -y libhdf5-serial-dev libopenmpi-dev openmpi-bin
 
     - name: Install pip dependencies
diff --git a/.github/workflows/sphinx.yml b/.github/workflows/sphinx.yml
index be358fa..c546c19 100644
--- a/.github/workflows/sphinx.yml
+++ b/.github/workflows/sphinx.yml
@@ -16,6 +16,7 @@ jobs:
 
       - name: Install apt dependencies
         run: |
+          sudo apt-get update
           sudo apt-get install -y libhdf5-serial-dev libopenmpi-dev openmpi-bin
       - uses: actions/checkout@v2
       - name: Install pip requirements