Index: b/diagrams-lib.cabal
===================================================================
--- a/diagrams-lib.cabal
+++ b/diagrams-lib.cabal
@@ -133,8 +133,7 @@ Library
                        profunctors >= 5.0 && < 6.0,
                        exceptions >= 0.6 && < 1.0,
                        cereal >=0.4.1.1 && <0.6,
-                       bytestring >=0.9 && <0.13,
-                       fail >= 4.9.0.0 && <4.10
+                       bytestring >=0.9 && <0.13
   Hs-source-dirs:      src
   ghc-options: -Wall
   default-language:    Haskell2010
