diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 56552e25..905e9572 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,7 +20,7 @@ jobs:
         sudo apt update
         sudo apt install -y wget npm python3 python3-pip
         sudo npm install -g tiddlywiki
-        sudo pip3 install beautifulsoup4
+        sudo pip3 install beautifulsoup4 html5lib
         bash ./Bootstrap.sh
 
     - name: Deploy
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2f00e979..26553b69 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@ before_script: |
   apk update
   apk add wget npm python3 py3-pip
   npm install -g tiddlywiki
-  pip3 install beautifulsoup4
+  pip3 install beautifulsoup4 html5lib
 
 pages:
   stage: deploy