diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
index 4fe36075e4..bd5c7b60db 100644
--- a/.github/workflows/CI.yaml
+++ b/.github/workflows/CI.yaml
@@ -15,6 +15,7 @@ jobs:
         pip install -r source/requirements.txt
     - name: Install LaTeX
       run: |
+        sudo apt-get update
         sudo apt install -y texlive-latex-recommended texlive-fonts-recommended texlive-latex-extra latexmk texlive-lang-greek texlive-luatex texlive-xetex texlive-fonts-extra dvipng librsvg2-bin
     - name: Build HTML
       run: |