diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index a5d1c84..61a52a2 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -25,6 +25,6 @@ jobs:
       - name: Install packages
         run:
           sudo apt-get update -y &&
-          sudo apt-get install -y git python3-sphinx graphviz libenchant1c2a
+          sudo apt-get install -y git python3-tox python3-sphinx graphviz libenchant1c2a
       - name: Test doc build
         run: tox -e docs