diff --git a/.github/workflows/test_linux.yml b/.github/workflows/test_linux.yml
index 5e65742..ee6290e 100644
--- a/.github/workflows/test_linux.yml
+++ b/.github/workflows/test_linux.yml
@@ -18,7 +18,7 @@ jobs:
     - uses: actions/setup-python@v2
       name: Install Python
       with:
-        python-version: '3.7'
+        python-version: '3.9'
 
     - name: install python packages
       run: python3 -m pip install numpy scipy
diff --git a/.github/workflows/test_macos.yml b/.github/workflows/test_macos.yml
index 5e971c1..59b6cd6 100644
--- a/.github/workflows/test_macos.yml
+++ b/.github/workflows/test_macos.yml
@@ -21,7 +21,7 @@ jobs:
         python-version: '3.9'
 
     - name: install python packages
-      run: python3 -m pip install numpy
+      run: python3 -m pip install numpy scipy
 
     - name: configure
       run: mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Debug ..
diff --git a/.github/workflows/test_windows.yml b/.github/workflows/test_windows.yml
index dc705c8..a712181 100644
--- a/.github/workflows/test_windows.yml
+++ b/.github/workflows/test_windows.yml
@@ -21,7 +21,7 @@ jobs:
         python-version: '3.7'
     
     - name: install python packages
-      run: python -m pip install numpy
+      run: python -m pip install numpy scipy
 
     - name: configure
       run: mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Debug ..