diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b53f3a8..dc73619 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,6 +18,6 @@ jobs:
         python-version: ${{ matrix.python }}
     - name: Install dependencies
       run: |
-        pip install nose2 numpy scipy scikit-learn
+        pip install nose2 numpy<=1.26.4 scipy scikit-learn
     - name: Run tests
       run: nose2 -v --pretty-assert
diff --git a/setup.py b/setup.py
index 929475d..bc62a6c 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
     include_package_data = True,
     platforms = 'any',
     install_requires = [
-        'numpy',
+        'numpy<=1.26.4',
     ],
     tests_require = [
         'nose2',