diff --git a/pyproject.toml b/pyproject.toml
index 00a37a9..a779685 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ license = { file = "LICENSE" }
 authors = [{ name = "Trail of Bits", email = "opensource@trailofbits.com" }]
 dependencies = [
     "maturin>=1.7,<2.0",
-    "cryptography>=44,<45",
+    "cryptography>=43,<45",
 ]
 
 [project.optional-dependencies]