diff --git a/pkgs/development/python-modules/mypy-boto3/default.nix b/pkgs/development/python-modules/mypy-boto3/default.nix
index 68fd6f965f9f..c68db9c39d62 100644
--- a/pkgs/development/python-modules/mypy-boto3/default.nix
+++ b/pkgs/development/python-modules/mypy-boto3/default.nix
@@ -1046,8 +1046,8 @@ in
       "sha256-315QgDF/CNolDYIYUcEGqdc5rQotI1uw0q8aQN9sW08=";
 
   mypy-boto3-polly =
-    buildMypyBoto3Package "polly" "1.42.3"
-      "sha256-cPeqJusVAoknOqIsQbtnq5ByHUx8lES4Vnln76wdyF0=";
+    buildMypyBoto3Package "polly" "1.42.66"
+      "sha256-uAOOFj4S9ip3VVjuS6bceXpUpVhOXHBklkfPbOT7Hzg=";
 
   mypy-boto3-pricing =
     buildMypyBoto3Package "pricing" "1.42.3"