diff --git a/releasenotes/notes/numpy-2-pin-11bc3a379fb29bf7.yaml b/releasenotes/notes/numpy-2-pin-11bc3a379fb29bf7.yaml
new file mode 100644
index 000000000..d5ac7a617
--- /dev/null
+++ b/releasenotes/notes/numpy-2-pin-11bc3a379fb29bf7.yaml
@@ -0,0 +1,12 @@
+---
+other:
+  - |
+    This version of rustworkx is explicitly pinned to the Numpy 1.x series,
+    because it includes compiled extensions that are not yet compiled against
+    the as-yet-unreleased Numpy 2.x series.  We will release a new version of
+    rustworkx with Numpy 2.x support as soon as feasible.
+
+    We cannot prevent your package manager from resolving to older versions of
+    rustworkx (which do not have the same pin but are still likely to be
+    incompatible) if you forcibly try to install rustworkx alongside Numpy 2,
+    before we have released a compatible version.
diff --git a/setup.py b/setup.py
index 7c0eac95d..4843ca98b 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@ def readme():
 PKG_NAME = os.getenv("RUSTWORKX_PKG_NAME", "rustworkx")
 PKG_VERSION = "0.14.0"
 PKG_PACKAGES = ["rustworkx", "rustworkx.visualization"]
-PKG_INSTALL_REQUIRES = ["numpy>=1.16.0"]
+PKG_INSTALL_REQUIRES = ["numpy>=1.16.0,<2"]
 RUST_EXTENSIONS = [RustExtension("rustworkx.rustworkx", "Cargo.toml",
                                  binding=Binding.PyO3, debug=rustworkx_debug)]