diff --git a/pkgs/development/python-modules/mypy-boto3/default.nix b/pkgs/development/python-modules/mypy-boto3/default.nix
index bd771635bb21..e89d73c4e9ba 100644
--- a/pkgs/development/python-modules/mypy-boto3/default.nix
+++ b/pkgs/development/python-modules/mypy-boto3/default.nix
@@ -462,8 +462,8 @@ rec {
       "sha256-KXtN44KAIDXjMgv3ICG8rXYfEjcZ85pQ+qdvN2Yiq3g=";
 
   mypy-boto3-ecs =
-    buildMypyBoto3Package "ecs" "1.35.64"
-      "sha256-3kD4U7XmqHVIYrSOU361t+OCf0GLjaORpV0vQB/rEyg=";
+    buildMypyBoto3Package "ecs" "1.35.66"
+      "sha256-0DmtbDZK4a4BjvhPcFEWIzWF8L+hCRYW+OF+cRhl0Rc=";
 
   mypy-boto3-efs =
     buildMypyBoto3Package "efs" "1.35.0"