diff --git a/default.nix b/default.nix
index d796be9..25c64e6 100644
--- a/default.nix
+++ b/default.nix
@@ -1,10 +1,5 @@
-{ rev ? "7c6985653708c5fade76d2014824ff333b0a07b2"
-, overlays ? [ (import ./overlay.nix) ]
-, pkgs ?
-    if ((rev == "") || (rev == "default") || (rev == "local"))
-      then import <nixpkgs> { inherit overlays; }
-      # Do not guard with hash, so the project is able to use current channels (rolling `rev`) of Nixpkgs
-      else import (builtins.fetchTarball "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz") { inherit overlays; }
+{ overlays ? [ (import ./overlay.nix) ]
+, pkgs ? import <nixpkgs> { inherit overlays; }
 }:
 
 let
diff --git a/implicitpipe.cabal b/implicitpipe.cabal
index 9f78271..1fde21a 100644
--- a/implicitpipe.cabal
+++ b/implicitpipe.cabal
@@ -19,7 +19,7 @@ library
                      , data-default
                      , directory
                      , filepath
-                     , fsnotify
+                     , fsnotify >= 0.4
                      , GPipe >= 2.2
                      , GPipe-GLFW >= 1.4
                      , GLFW-b
diff --git a/overlay.nix b/overlay.nix
index 40409c0..8a933f1 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -22,8 +22,8 @@ in
       overrides = super.lib.composeExtensions (old.overrides or (_: _: {}))
         (hself: hsuper: {
            #GPipe = super.haskell.lib.doJailbreak hsuper.GPipe;
-           GPipe = hsuper.callCabal2nix "GPipe" "${gpipeSrc}/GPipe-Core" {};
-           GPipe-GLFW = hsuper.callCabal2nix "GPipe-GLFW" ("${gpipeGlfwSrc}/GPipe-GLFW") {};
+           GPipe = super.haskell.lib.doJailbreak (hsuper.callCabal2nix "GPipe" "${gpipeSrc}/GPipe-Core" {});
+           GPipe-GLFW = super.haskell.lib.doJailbreak (hsuper.callCabal2nix "GPipe-GLFW" ("${gpipeGlfwSrc}/GPipe-GLFW") {});
 
            # for development
            # implicit = hsuper.callCabal2nix "implicit" (super.fetchFromGitHub {
diff --git a/src/Graphics/Implicit/Viewer/Loaders.hs b/src/Graphics/Implicit/Viewer/Loaders.hs
index 0ce314d..eb26911 100644
--- a/src/Graphics/Implicit/Viewer/Loaders.hs
+++ b/src/Graphics/Implicit/Viewer/Loaders.hs
@@ -52,7 +52,7 @@ runUpdater modFileRel initialResolution renderChan = void $ do
     eventHandler (FSNotify.Modified fp _ _) = atomically $ writeTChan watchEvent fp
     eventHandler _ = return ()
 
-  void $ async $ FSNotify.withManagerConf (FSNotify.defaultConfig { FSNotify.confDebounce = FSNotify.Debounce 1 }) $ \mgr -> do
+  void $ async $ FSNotify.withManagerConf FSNotify.defaultConfig $ \mgr -> do
     void $ FSNotify.watchDir
       mgr
       (System.FilePath.takeDirectory modFile)