diff --git a/conda-environments/docbuild.yml b/conda-environments/docbuild.yml
index f89e1ac1c..6a9b88ef2 100644
--- a/conda-environments/docbuild.yml
+++ b/conda-environments/docbuild.yml
@@ -28,7 +28,7 @@ dependencies:
 - myst-nb
 - myst-parser
 - numba >= 0.56.4
-- numpy >= 1.16.1
+- numpy >= 1.16.1, <2
 - numpydoc
 - openmatrix >= 0.3.4.1
 - orca >= 1.6
diff --git a/pyproject.toml b/pyproject.toml
index 92e8d85f7..07ec493ec 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ dynamic = ["version"]
 dependencies = [
     "cytoolz >= 0.8.1",
     "numba >= 0.55.2",
-    "numpy >= 1.16.1",
+    "numpy >= 1.16.1, <2",
     "openmatrix >= 0.3.4.1",
     "orca >= 1.6",
     "pandas >= 1.4, <2",