diff --git a/Graphics/PDF/Image.hs b/Graphics/PDF/Image.hs
--- a/Graphics/PDF/Image.hs
+++ b/Graphics/PDF/Image.hs
@@ -37,6 +37,7 @@
 import Graphics.PDF.Resources
 import Graphics.PDF.Pages
 import qualified Data.ByteString.Lazy as B
+import Control.Monad
 import Control.Monad.Writer
 #if __GLASGOW_HASKELL__ >= 608
 import System.IO hiding(withFile)
diff --git a/HPDF.cabal b/HPDF.cabal
--- a/HPDF.cabal
+++ b/HPDF.cabal
@@ -1,5 +1,5 @@
 Name: HPDF
-Version: 1.6.0
+Version: 1.6.1
 cabal-version: >=1.10
 License: BSD3
 License-file:LICENSE
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,13 @@
 # Changelog for [`HPDF` package](http://hackage.haskell.org/package/HPDF)
 
+## 1.6.1
+
+   * Fix for building with mtl-2.3
+
+## 1.6.0
+
+   * Allow parsing afm-data from bytestring
+
 ## 1.5.3
 
    * Fixed distribution issue (font files not correctly embedded in the sdist