diff --git a/nix/sources.json b/nix/sources.json
index f0f52a18..9ddef0a8 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -58,7 +58,7 @@
     "nix-output-monitor": {
         "branch": "master",
         "repo": "git@hera.m-0.eu:nix-output-monitor",
-        "rev": "9c0395040e3e4907bb6df33b5b81893c467f01e9",
+        "rev": "88b573810eed627685568d04e379a31e1f74d3ce",
         "type": "git"
     },
     "nixos-19.09": {
diff --git a/overlays/10-previews.nix b/overlays/10-previews.nix
index 5ac6305f..35c5578f 100644
--- a/overlays/10-previews.nix
+++ b/overlays/10-previews.nix
@@ -13,6 +13,6 @@ in
   vscode = unstable.vscode;
   nix-output-monitor = unstable.nix-output-monitor.overrideAttrs (old: {
     src = super.sources.nix-output-monitor;
-    buildInputs = old.buildInputs ++ (with unstable.haskellPackages; [ streamly optics generic-optics extra safe ]);
+    buildInputs = old.buildInputs ++ (with unstable.haskellPackages; [ streamly optics generic-optics extra safe MemoTrie ]);
   });
 }