diff --git a/pkgs/development/python-modules/mypy-boto3/default.nix b/pkgs/development/python-modules/mypy-boto3/default.nix
index 39e1d7d8e370..a9f3ef8b8d7f 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-bX6nxgcmAQudjbMK53TAtaJUx/GM0F4t7CXIsWaE64E=";
 
   mypy-boto3-synthetics =
-    buildMypyBoto3Package "synthetics" "1.39.0"
-      "sha256-nDL0trCi65U88Fs7hPm7i71aBxDR8hZ54Z1KwmAmvA8=";
+    buildMypyBoto3Package "synthetics" "1.39.8"
+      "sha256-oEWsMardjPV3ZlyStCdvZxDaKxE4ewq4MYiO6xAxuN4=";
 
   mypy-boto3-textract =
     buildMypyBoto3Package "textract" "1.39.0"