diff --git a/seqloc.cabal b/seqloc.cabal
--- a/seqloc.cabal
+++ b/seqloc.cabal
@@ -1,5 +1,5 @@
 Name:                seqloc
-Version:             0.3.1.2
+Version:             0.5
 Cabal-Version:       >= 1.2
 Synopsis:            Handle sequence locations for bioinformatics
 Description:         Handle sequence locations for bioinformatics
@@ -24,7 +24,7 @@
                        Bio.SeqLoc.OnSeq,
                        Bio.SeqLoc.LocRepr,
                        Bio.SeqLoc.Transcript
-  Build-depends:       base >= 4.2 && < 5, bytestring, attoparsec >= 0.8.5, biocore
+  Build-depends:       base >= 4.2 && < 5, bytestring, attoparsec >= 0.8.5, biocore >= 0.2
   Hs-Source-Dirs:      src
   Ghc-options:         -Wall
 
@@ -38,6 +38,6 @@
                        Bio.SeqLoc.OnSeq,
                        Bio.SeqLoc.LocRepr
   Build-depends:       base >= 4.2 && < 5, bytestring, attoparsec >= 0.8.5,
-                       QuickCheck, random, biocore
+                       QuickCheck, random, biocore >= 0.2
   Hs-Source-Dirs:      src, test
   Ghc-options:         -Wall
diff --git a/src/Bio/SeqLoc/Position.hs b/src/Bio/SeqLoc/Position.hs
--- a/src/Bio/SeqLoc/Position.hs
+++ b/src/Bio/SeqLoc/Position.hs
@@ -32,17 +32,6 @@
 import Bio.SeqLoc.SeqLike
 import Bio.SeqLoc.Strand
 
-instance Enum Offset where
-  toEnum = Offset . toEnum
-  fromEnum = fromEnum . unOff
-
-instance Real Offset where
-  toRational = toRational . unOff
-
-instance Integral Offset where
-  (Offset n) `quotRem` (Offset d) = (Offset *** Offset) $ n `quotRem` d
-  toInteger = toInteger . unOff
-  
 -- | Stranded position in a sequence
 data Pos = Pos { offset :: !Offset -- ^ 0-based index of the position
                , strand :: !Strand -- ^ Strand of the position