diff --git a/.github/workflows/build_test.yml b/.github/workflows/build_test.yml
index f33d116..8e12476 100644
--- a/.github/workflows/build_test.yml
+++ b/.github/workflows/build_test.yml
@@ -40,6 +40,8 @@ jobs:
         flake8 ${{ env.SRC_DIR }} --count --exit-zero --isolated --max-complexity=10 --max-doc-length=72 --select=C901,W505 --statistics
     - name: Install package
       run: pip install .
+    - name: Install test requirements
+      run: pip install -r test/requirements.txt
     - name: Test package
       run: |
         pip install pytest
diff --git a/test/requirements.txt b/test/requirements.txt
new file mode 100644
index 0000000..24ce15a
--- /dev/null
+++ b/test/requirements.txt
@@ -0,0 +1 @@
+numpy