diff --git a/ci/requirements/doc.yml b/ci/requirements/doc.yml
index 39c2d4d6e88..116eee7f702 100644
--- a/ci/requirements/doc.yml
+++ b/ci/requirements/doc.yml
@@ -21,7 +21,7 @@ dependencies:
   - nbsphinx
   - netcdf4>=1.5
   - numba
-  - numpy>=1.21
+  - numpy>=1.21,<2
   - packaging>=21.3
   - pandas>=1.4,!=2.1.0
   - pooch
diff --git a/ci/requirements/environment-windows.yml b/ci/requirements/environment-windows.yml
index 3b2e6dc62e6..4cdddc676eb 100644
--- a/ci/requirements/environment-windows.yml
+++ b/ci/requirements/environment-windows.yml
@@ -23,7 +23,7 @@ dependencies:
   - netcdf4
   - numba
   - numbagg
-  - numpy
+  - numpy<2
   - packaging
   - pandas
   # - pint>=0.22
diff --git a/ci/requirements/environment.yml b/ci/requirements/environment.yml
index 01521e950f4..f1a10bc040b 100644
--- a/ci/requirements/environment.yml
+++ b/ci/requirements/environment.yml
@@ -26,7 +26,7 @@ dependencies:
   - numba
   - numbagg
   - numexpr
-  - numpy
+  - numpy<2
   - opt_einsum
   - packaging
   - pandas