diff --git a/pyproject.toml b/pyproject.toml
index b6def35..d74728f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Mathematics",
 ]
 urls = {repository = "https://github.com/google/jaxtyping" }
-dependencies = ["numpy>=1.20.0", "typeguard>=2.13.3", "typing_extensions>=3.7.4.1"]
+dependencies = ["numpy>=1.20.0", "typeguard>=2.13.3,<3", "typing_extensions>=3.7.4.1"]
 entry-points = {pytest11 = {jaxtyping = "jaxtyping._pytest_plugin"}}
 
 [build-system]