diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index 598384ded..f2cb3c064 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -18,7 +18,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install mypy pyparsing geomdl
+        python -m pip install wheel mypy pyparsing numpy fonttools
     - name: Install without C-extensions
       run: |
         python setup.py install
diff --git a/.github/workflows/testcext.yml b/.github/workflows/testcext.yml
index 37934f7ba..1a242530d 100644
--- a/.github/workflows/testcext.yml
+++ b/.github/workflows/testcext.yml
@@ -23,7 +23,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install pytest pyparsing fonttools numpy
+        python -m pip install wheel pytest pyparsing fonttools numpy
     - name: Install with C-extensions
       run: |
         python setup.py install
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 3a26c8e61..39af120fe 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -24,7 +24,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         # Excluding Cython to test the pure Python version.
-        python -m pip install pytest pyparsing fonttools numpy
+        python -m pip install wheel pytest pyparsing fonttools numpy
     - name: Install without C-extensions
       run: |
         python setup.py install