diff --git a/pkgs/development/python-modules/mypy-boto3/default.nix b/pkgs/development/python-modules/mypy-boto3/default.nix
index 475e78f4ace6..c8e39a76fde2 100644
--- a/pkgs/development/python-modules/mypy-boto3/default.nix
+++ b/pkgs/development/python-modules/mypy-boto3/default.nix
@@ -1346,8 +1346,8 @@ rec {
       "sha256-b6TgvxWdQI5TAI/OsJzmzlte1v30NdJucdedKgCb9LY=";
 
   mypy-boto3-synthetics =
-    buildMypyBoto3Package "synthetics" "1.38.0"
-      "sha256-cf3vKJHOS6LJ5fvSYaqZgzou51s3PuLgrhjK0H8/yYA=";
+    buildMypyBoto3Package "synthetics" "1.38.11"
+      "sha256-t9gwrPdz8QSB6pDeOZgB+Jl/I91vG58et5XzTXXqZuA=";
 
   mypy-boto3-textract =
     buildMypyBoto3Package "textract" "1.38.0"