2 files changed, 10 insertions, 0 deletions
diff --git a/.github/workflows/check-toc.yml b/.github/workflows/check-toc.yml
index 2b478cb63..71916ac81 100644
--- a/.github/workflows/check-toc.yml
+++ b/.github/workflows/check-toc.yml
@@ -10,4 +10,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Install Mono
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y mono-complete
+
       - run: ./docs/build_toc.sh --check-only
diff --git a/.github/workflows/regenerate-toc.yml b/.github/workflows/regenerate-toc.yml
index 973bbcf95..0573f21fd 100644
--- a/.github/workflows/regenerate-toc.yml
+++ b/.github/workflows/regenerate-toc.yml
@@ -22,6 +22,11 @@ jobs:
           ref: ${{ github.event.client_payload.pull_request.base.ref }}
           path: target-branch
 
+      - name: Install Mono
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y mono-complete
+
       - name: Regenerate Table of Contents
         id: regen
         run: |