diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 9b958cbd7d2..acd81c84d8d 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1312,7 +1312,7 @@ rec {
     };
 
     buildInputs = [ unittest2 ];
-    propagatedBuildInputs = [ colander sqlalchemy8 ];
+    propagatedBuildInputs = [ colander sqlalchemy9 ];
 
     # string: argument name cannot be overridden via info kwarg.
     doCheck = false;