diff --git a/lib/XMonad/Internal/Concurrent/DynamicWorkspaces.hs b/lib/XMonad/Internal/Concurrent/DynamicWorkspaces.hs
index a5a9f2e..7508b39 100644
--- a/lib/XMonad/Internal/Concurrent/DynamicWorkspaces.hs
+++ b/lib/XMonad/Internal/Concurrent/DynamicWorkspaces.hs
@@ -51,8 +51,6 @@ import           Graphics.X11.Xlib.Extras
 import           Graphics.X11.Xlib.Misc
 import           Graphics.X11.Xlib.Types
 
-import           System.Process                           (Pid)
-
 import           XMonad.Actions.DynamicWorkspaces
 import           XMonad.Core
     ( ManageHook
diff --git a/lib/XMonad/Internal/Concurrent/Removable.hs b/lib/XMonad/Internal/Concurrent/Removable.hs
index 44c030d..e7323b7 100644
--- a/lib/XMonad/Internal/Concurrent/Removable.hs
+++ b/lib/XMonad/Internal/Concurrent/Removable.hs
@@ -12,7 +12,6 @@ import           Control.Concurrent
 import           Control.Monad
 
 import           Data.Map.Lazy         (Map, member)
-import           Data.Maybe            (maybe)
 
 import           DBus
 import           DBus.Client
diff --git a/stack.yaml b/stack.yaml
index 0938a7b..ba5ddb9 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -17,7 +17,7 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-14.27
+resolver: lts-17.4
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.
@@ -42,8 +42,10 @@ packages:
 extra-deps:
 - iwlib-0.1.0
 - fdo-notify-0.3.1
+- tcp-streams-1.0.1.1
 - github: ndwarshuis/xmobar
-  commit: 4186bcbc50a7c78ac0aee8bc3719e0dd9a46dace
+  # commit: 4186bcbc50a7c78ac0aee8bc3719e0dd9a46dace
+  commit: 7d37ab57d8160cf840c1fe2a279c89eac599a10b
 
 # Override default flag values for local packages and extra-deps
 # flags: {}