diff --git a/pkgs/development/python-modules/mypy-boto3/default.nix b/pkgs/development/python-modules/mypy-boto3/default.nix
index 027b4f537404..e8b1bffc6765 100644
--- a/pkgs/development/python-modules/mypy-boto3/default.nix
+++ b/pkgs/development/python-modules/mypy-boto3/default.nix
@@ -990,8 +990,8 @@ rec {
       "sha256-Ntxi/vlYmPzqrO/Q+sTaOqGB/gnaIThrEcrdcmNawBo=";
 
   mypy-boto3-osis =
-    buildMypyBoto3Package "osis" "1.39.0"
-      "sha256-V9cGwQuN8vJTENA/8Tn0+C0s08VcwuH0ZngMUKh6voM=";
+    buildMypyBoto3Package "osis" "1.39.15"
+      "sha256-2CyrEtINnLIV9qUPrPgDwD4YDXSjlTBPQtHEMohB2Bg=";
 
   mypy-boto3-outposts =
     buildMypyBoto3Package "outposts" "1.39.9"