diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 68b49fb4..b76e5269 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,12 +27,12 @@ jobs:
           - name-suffix: "wheel-h5py_3.0.0"
             os: ubuntu-latest
             python-version: '3.7'
-            OLDEST_DEPENDENCIES: 'h5py==3.0.0'
+            OLDEST_DEPENDENCIES: 'h5py==3.0.0 "numpy<2"'
 
           - name-suffix: "sdist-h5py_3.6.0"
             os: ubuntu-latest
             python-version: '3.10'
-            OLDEST_DEPENDENCIES: 'h5py==3.6.0'
+            OLDEST_DEPENDENCIES: 'h5py==3.6.0 "numpy<2"'
 
           - name-suffix: "wheel-h5py_3.10.0"
             os: ubuntu-latest