diff --git a/.github/workflows/nPYc-test-ci-monthly.yml b/.github/workflows/nPYc-test-ci-monthly.yml
index 9fc178f..2cb8dc8 100644
--- a/.github/workflows/nPYc-test-ci-monthly.yml
+++ b/.github/workflows/nPYc-test-ci-monthly.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.8, 3.9]
+        python-version: [3.9]
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
     - uses: actions/checkout@v2
diff --git a/.github/workflows/nPYc-test-ci.yml b/.github/workflows/nPYc-test-ci.yml
index ca60c49..1db317d 100644
--- a/.github/workflows/nPYc-test-ci.yml
+++ b/.github/workflows/nPYc-test-ci.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.8, 3.9]
+        python-version: [3.9]
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
     - uses: actions/checkout@v2
diff --git a/requirements.txt b/requirements.txt
index dd93301..723e981 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ openpyxl
 pandas~=1.5.0
 plotly>=3.1.0
 scikit-learn>=0.19.1
-scipy>=1.1.0
+scipy==1.11.4
 seaborn
 setuptools>=39.1.0
 statsmodels>=0.9.0