diff --git a/.github/workflows/test_build.yml b/.github/workflows/test_build.yml
index 642a8b69..279a79ba 100644
--- a/.github/workflows/test_build.yml
+++ b/.github/workflows/test_build.yml
@@ -27,6 +27,9 @@ jobs:
           ln -sf /usr/local/bin/gcc-12 /usr/local/bin/gcc
           ls /usr/local/bin/gcc*
           gcc --version
+      - name: Install blas for i686
+        if: matrix.os == 'ubuntu-20.04'
+        run: sudo apt-get install libopenblas-dev
       - name: Build wheels
         run: python -m cibuildwheel --output-dir wheelhouse
         env:
diff --git a/pyproject.toml b/pyproject.toml
index d0c6ea5f..ede7a018 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ['setuptools', 'numpy<1.26.0', 'Cython<3.0.0']
+requires = ['setuptools', 'numpy', 'Cython<3.0.0']
 build-backend = 'setuptools.build_meta'
 
 [project]