diff --git a/src/Graphics/XDot/Types.hs b/src/Graphics/XDot/Types.hs
--- a/src/Graphics/XDot/Types.hs
+++ b/src/Graphics/XDot/Types.hs
@@ -6,6 +6,7 @@
 
    This module contains various types used to represent xdot parameters.
  -}
+{-# LANGUAGE DeriveGeneric, DeriveAnyClass #-}
 module Graphics.XDot.Types (
   Point,
   Rectangle,
@@ -15,6 +16,9 @@
   )
   where
 
+import GHC.Generics (Generic)
+import Control.DeepSeq
+
 -- | A simple point, consisting of an x and y position.
 type Point = (Double, Double)
 
@@ -25,13 +29,13 @@
 data Alignment = LeftAlign
                | CenterAlign
                | RightAlign
-               deriving Show
+               deriving (Show, Generic, NFData)
 
 -- | An object an operation can belong to.
 data Object n = None
               | Node n
               | Edge n n
-              deriving (Show, Eq)
+              deriving (Show, Eq, Generic, NFData)
 
 -- | Drawing operations supported by xdot. See
 --   <http://www.graphviz.org/doc/info/output.html#d:xdot> for more information
@@ -46,4 +50,4 @@
                | Font { size :: Double, name :: String }
                | Style { style :: String } -- TODO: Add type
                | Image { xy :: Point, w :: Double, h :: Double, name :: String }
-               deriving Show
+               deriving (Show, Generic, NFData)
diff --git a/src/Graphics/XDot/Viewer.hs b/src/Graphics/XDot/Viewer.hs
--- a/src/Graphics/XDot/Viewer.hs
+++ b/src/Graphics/XDot/Viewer.hs
@@ -20,9 +20,11 @@
   cairoContextGetFontOptions, layoutGetContext, createLayout)
 import Graphics.Rendering.Cairo hiding (x, y)
 
-import Control.Monad.State hiding (State)
-import qualified Control.Monad.State as MS
+import Control.Monad.State.Strict hiding (State)
+import qualified Control.Monad.State.Strict as MS
 
+import Control.DeepSeq
+
 type RGBA = (Double, Double, Double, Double)
 
 data DState = DState
@@ -36,7 +38,7 @@
 type DrawState a = MS.StateT DState Render a
 
 -- | Draw an xdot graph, possibly highlighting a node.
-drawAll :: Eq t => 
+drawAll :: (Eq t, NFData t) =>
      Object t -- ^ id of the node to highlight
   -> Rectangle -- ^ dimensions of the graph, as returned by 'Graphics.XDot.Parser.getSize'
   -> [(Object t, Operation)] -- ^ operations, as returned by 'Graphics.XDot.Parser.getOperations'
@@ -50,7 +52,7 @@
   translate offsetx offsety
   scale scalex scaley
 
-  boundingBoxes <- evalStateT (mapM (draw hover) ops) $ DState "" 1 1 [] (1,1,1,1) (0,0,0,1)
+  boundingBoxes <- evalStateT (mapM (draw hover) $!! ops) $ DState "" 1 1 [] (1,1,1,1) (0,0,0,1)
 
   restore
   return
diff --git a/xdot.cabal b/xdot.cabal
--- a/xdot.cabal
+++ b/xdot.cabal
@@ -1,13 +1,13 @@
 name:               xdot
-version:            0.3.0.1
+version:            0.3.0.2
 license:            BSD3
 license-file:       LICENSE
 category:           Graphs, Graphics
-cabal-version:      >= 1.10
+cabal-version:      >= 1.18
 build-type:         Simple
 author:             Dennis Felsing <dennis@felsin9.de>
 maintainer:         Dennis Felsing <dennis@felsin9.de>
-copyright:          Dennis Felsing 2012-2016
+copyright:          Dennis Felsing 2012-2019
 synopsis:           Parse Graphviz xdot files and interactively view them using GTK and Cairo
 description:        Parse Graphviz xdot files and interactively view them using
                     GTK and Cairo.
@@ -22,23 +22,25 @@
                     is now a separate project, in case anyone else may have a
                     use for it.
 
-tested-with: GHC == 7.4.1, GHC == 7.4.2, GHC == 7.6.1, GHC == 7.6.2, GHC == 7.6.3, GHC == 7.8.3, GHC == 7.10.1, GHC == 7.10.2, GHC == 7.10.3
+tested-with: GHC == 8.0.2 || == 8.2.2 || == 8.4.4 || == 8.6.5
 Extra-source-files: dot-examples/*.dot
 Library
   Exposed-modules: Graphics.XDot.Parser Graphics.XDot.Viewer Graphics.XDot.Types
   Default-Language: Haskell2010
-  Build-depends: base == 4.*,
-                 mtl >= 2.0 && < 2.3,
-                 cairo >= 0.12 && < 0.14,
-                 gtk3 >= 0.12 && < 0.15,
-                 graphviz >= 2999.16 && < 2999.19,
-                 text >= 0.11 && < 1.3,
-                 polyparse >= 1.8 && < 1.13
+  Build-depends: base >= 4.9.1 && < 4.14,
+                 mtl >= 2.0,
+                 cairo >= 0.12,
+                 gtk3 >= 0.12,
+                 graphviz >= 2999.16,
+                 text >= 0.11,
+                 polyparse >= 1.8,
+                 deepseq >= 1.2
   Hs-source-dirs: src/
   Ghc-options: -Wall -fno-warn-unused-do-bind
 
 Executable xdot-demo
   Default-Language: Haskell2010
+  Ghc-options: -Wall -fno-warn-unused-do-bind
   Main-Is: Demo.hs
   Build-depends: base,
                  cairo,
@@ -46,6 +48,7 @@
                  gtk3,
                  text,
                  transformers,
+                 deepseq,
                  -- ourselves
                  xdot