diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 38090bf..444d74e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,9 +13,17 @@ on:
 
 jobs:
   build:
+    strategy:
+      matrix:
+        os: [ubuntu-20.04]
+        python-version: [3.7, 3.8, 3.9, 3.10.6, 3.11]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
       - name: Setup Packages
         run: sh tools/setup.sh
       - name: Build Packages
diff --git a/mathy_core/problems.py b/mathy_core/problems.py
index e217764..43aaa58 100644
--- a/mathy_core/problems.py
+++ b/mathy_core/problems.py
@@ -25,7 +25,7 @@
 @dataclass
 class MathyTermTemplate:
     variable: Optional[str] = None  # the term variable
-    exponent: Optional[int | float] = None  # the term exponent
+    exponent: Optional[Union[int, float]] = None  # the term exponent
 
     def make(self) -> str:
         return mathy_term_string(
diff --git a/tools/setup.sh b/tools/setup.sh
index e993e8e..5db5798 100644
--- a/tools/setup.sh
+++ b/tools/setup.sh
@@ -1,6 +1,8 @@
 #!/bin/bash
 set -e
 
+python3 --version
+
 # Make the virtualenv only if the folder doesn't exist
 DIR=.env
 if [ ! -d "${DIR}" ]; then