diff --git a/.github/workflows/gen_docs.yml b/.github/workflows/gen_docs.yml
index 2418481..1a07f0c 100644
--- a/.github/workflows/gen_docs.yml
+++ b/.github/workflows/gen_docs.yml
@@ -18,7 +18,7 @@ jobs:
       run: sudo apt update
 
     - name: Install Python dev
-      run: sudo apt-get install python3-pip python3-dev python3-setuptools python3-pil
+      run: sudo apt-get install python3-pip python3-dev python3-setuptools python3-pil gifsicle
 
     - name: Install OpenSCAD-DocsGen package.
       run: sudo pip3 install openscad-docsgen
diff --git a/.github/workflows/gen_tutorials.yml b/.github/workflows/gen_tutorials.yml
index c4e3424..606e48f 100644
--- a/.github/workflows/gen_tutorials.yml
+++ b/.github/workflows/gen_tutorials.yml
@@ -18,7 +18,7 @@ jobs:
       run: sudo apt update
 
     - name: Install Python dev
-      run: sudo apt-get install python3-pip python3-dev python3-setuptools python3-pil
+      run: sudo apt-get install python3-pip python3-dev python3-setuptools python3-pil gifsicle
 
     - name: Install OpenSCAD-DocsGen package.
       run: sudo pip3 install openscad-docsgen