diff --git a/pkgs/development/python-modules/mypy-boto3/default.nix b/pkgs/development/python-modules/mypy-boto3/default.nix
index 3be0255e6088..0ff5f0870992 100644
--- a/pkgs/development/python-modules/mypy-boto3/default.nix
+++ b/pkgs/development/python-modules/mypy-boto3/default.nix
@@ -1422,8 +1422,8 @@ rec {
       "sha256-/FHnjne3cQ2ecEoPzJWNaoX/ACKlDIi0goGOwRn/1Ww=";
 
   mypy-boto3-workmailmessageflow =
-    buildMypyBoto3Package "workmailmessageflow" "1.38.0"
-      "sha256-naClNCiAqHalhT/+8cI510kBzYxpY3Z+wppDpQbZtdg=";
+    buildMypyBoto3Package "workmailmessageflow" "1.39.0"
+      "sha256-SxRBlQAgb/WMhQlGrO7iVB6U/B5dYTlCuiPqKQmy5s4=";
 
   mypy-boto3-workspaces =
     buildMypyBoto3Package "workspaces" "1.38.45"