diff --git a/pkgs/development/python-modules/mypy-boto3/default.nix b/pkgs/development/python-modules/mypy-boto3/default.nix
index 62d0e3c35bcc..c3595a10db3e 100644
--- a/pkgs/development/python-modules/mypy-boto3/default.nix
+++ b/pkgs/development/python-modules/mypy-boto3/default.nix
@@ -141,7 +141,7 @@ rec {
 
   mypy-boto3-clouddirectory = buildMypyBoto3Package "clouddirectory" "1.34.0" "sha256-lWJQClNEhyq9CN8ThcHtVcEsowIp+V8RXh4rgHAclfM=";
 
-  mypy-boto3-cloudformation = buildMypyBoto3Package "cloudformation" "1.34.65" "sha256-CQJJPyXyPnCNYxKUt3m7uz6UaFQt1+JH3m6KyOJHelQ=";
+  mypy-boto3-cloudformation = buildMypyBoto3Package "cloudformation" "1.34.66" "sha256-KV3bh48/S2FIm4O9S62Uk4LeuKR4/1rmbCLKP/urvpU=";
 
   mypy-boto3-cloudfront = buildMypyBoto3Package "cloudfront" "1.34.0" "sha256-3n/WEiQdcE253J+CFsskoYlNMXASdzkhPTWneSHDKoM=";