diff --git a/pkgs/development/python-modules/grpcio/default.nix b/pkgs/development/python-modules/grpcio/default.nix
index 5dc26d50be2b..8cff17c81eb4 100644
--- a/pkgs/development/python-modules/grpcio/default.nix
+++ b/pkgs/development/python-modules/grpcio/default.nix
@@ -19,11 +19,11 @@
 buildPythonPackage rec {
   pname = "grpcio";
   format = "setuptools";
-  version = "1.64.1";
+  version = "1.66.2";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-jVHdHFnV+g80JmuAo4BewpofJkJcKlRzYTP22H/Eloo=";
+    hash = "sha256-VjWIxYe3XDS5KLxChUjlsA6jjEaXIYGk2Ldbp+PyQjE=";
   };
 
   outputs = [