diff --git a/.appveyor.yml b/.appveyor.yml
index 1d07cc5..0a1c8de 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -6,7 +6,7 @@ environment:
 
 install:
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
-  - "python.exe -m pip install codecov coverage pytest-cov scipy"
+  - "python.exe -m pip install codecov coverage pytest-cov 'numpy<2' scipy"
 
 build: off
 
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0003bae..98b8ab0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -25,7 +25,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        pip install coverage scipy pytest-cov flake8 pep8-naming
+        pip install coverage scipy 'numpy<2' pytest-cov flake8 pep8-naming
         if [ "${{ matrix.with_qt }}" = "true" ]; then pip install PyQt5; fi;
     - name: Test
       run: |