diff --git a/pkgs/development/python-modules/mypy-boto3/default.nix b/pkgs/development/python-modules/mypy-boto3/default.nix
index 87b548563544..3ec61ed27885 100644
--- a/pkgs/development/python-modules/mypy-boto3/default.nix
+++ b/pkgs/development/python-modules/mypy-boto3/default.nix
@@ -961,8 +961,8 @@ in
       "sha256-gs9eGyRaZN7Fsl0D5fSqtTiYZ+Exp0s8QW/X8ZR7guA=";
 
   mypy-boto3-oam =
-    buildMypyBoto3Package "oam" "1.41.0"
-      "sha256-xuliXXmknsXPmuEaYga3w3fGQOAnXD3v8o50lRov5h8=";
+    buildMypyBoto3Package "oam" "1.42.3"
+      "sha256-CGt/WuKol9nVwLHEwNgEsQDzIBhFarJNbq30OpiK0+I=";
 
   mypy-boto3-omics =
     buildMypyBoto3Package "omics" "1.41.0"