diff --git a/pkgs/desktops/xfce/applications/xfce4-taskmanager/default.nix b/pkgs/desktops/xfce/applications/xfce4-taskmanager/default.nix
index 4eb6786ffddc..dc2412b329c8 100644
--- a/pkgs/desktops/xfce/applications/xfce4-taskmanager/default.nix
+++ b/pkgs/desktops/xfce/applications/xfce4-taskmanager/default.nix
@@ -1,30 +1,34 @@
 { lib
 , mkXfceDerivation
 , exo
+, glib
 , gtk3
 , libxfce4ui
 , xfconf
 , libwnck
+, libX11
 , libXmu
 }:
 
 mkXfceDerivation {
   category = "apps";
   pname = "xfce4-taskmanager";
-  version = "1.5.5";
+  version = "1.5.6";
   odd-unstable = false;
 
-  sha256 = "sha256-worHYB9qibRxMaCYQ0+nHA9CSTColewgahyrXiPOnQA=";
+  sha256 = "sha256-2NkjaK6xXsrMimriO2/gTOZowt9KTX4MrWJpPXM0w68=";
 
   nativeBuildInputs = [
     exo
   ];
 
   buildInputs = [
+    glib
     gtk3
     libxfce4ui
     xfconf
     libwnck
+    libX11
     libXmu
   ];