diff --git a/pkgs/development/python-modules/mypy-boto3/default.nix b/pkgs/development/python-modules/mypy-boto3/default.nix
index 0c99c7775263..eb1a2efb9f06 100644
--- a/pkgs/development/python-modules/mypy-boto3/default.nix
+++ b/pkgs/development/python-modules/mypy-boto3/default.nix
@@ -1421,8 +1421,8 @@ rec {
       "sha256-A5N1xhW0bgB7N60uWf3mqtDAhtRTz05GO7RmapdG1c4=";
 
   mypy-boto3-workmailmessageflow =
-    buildMypyBoto3Package "workmailmessageflow" "1.40.0"
-      "sha256-zApXRQ+MpzmwpQcghnoC34FaKlLQ/g8kZZUwbU0G8p8=";
+    buildMypyBoto3Package "workmailmessageflow" "1.40.20"
+      "sha256-wOW0p/aZvOe3zQc9eIAirP4NmiVUUSxIeUwEIWbK4Eo=";
 
   mypy-boto3-workspaces =
     buildMypyBoto3Package "workspaces" "1.40.10"