diff --git a/Language/GLSL/Parser.hs b/Language/GLSL/Parser.hs
--- a/Language/GLSL/Parser.hs
+++ b/Language/GLSL/Parser.hs
@@ -261,6 +261,9 @@
 infixLeft' :: String -> (a -> a -> a) -> Operator Char S a
 infixLeft' s r = Infix (lexeme (try $ string s >> notFollowedBy (char '=')) >> return r) AssocLeft
 
+infixLeft'' :: Char -> (a -> a -> a) -> Operator Char S a
+infixLeft'' c r = Infix (lexeme (try $ char c >> notFollowedBy (oneOf (c:"="))) >> return r) AssocLeft
+
 infixRight :: String -> (a -> a -> a) -> Operator Char S a
 infixRight s r = Infix (lexeme (try $ string s) >> return r) AssocRight
 
@@ -272,9 +275,9 @@
   , [infixLeft' "<" Lt, infixLeft' ">" Gt
     ,infixLeft "<=" Lte, infixLeft ">=" Gte]
   , [infixLeft "==" Equ, infixLeft "!=" Neq]
-  , [infixLeft' "&" BitAnd]
+  , [infixLeft'' '&' BitAnd]
   , [infixLeft' "^" BitXor]
-  , [infixLeft' "|" BitOr]
+  , [infixLeft'' '|' BitOr]
   , [infixLeft "&&" And]
   , [infixLeft "||" Or]
   ]
diff --git a/language-glsl.cabal b/language-glsl.cabal
--- a/language-glsl.cabal
+++ b/language-glsl.cabal
@@ -1,5 +1,5 @@
 name:                language-glsl
-version:             0.0.0
+version:             0.0.1
 Cabal-Version:       >= 1.8
 synopsis:            GLSL abstract syntax tree, parser, and pretty-printer
 description:
@@ -11,9 +11,7 @@
 license:             BSD3
 license-file:        LICENSE
 author:              Vo Minh Thu
-maintainer:          thu@hypered.be
-homepage:            https://github.com/noteed/language-glsl
-bug-reports:         https://github.com/noteed/language-glsl/issues
+maintainer:          noteed@gmail.com
 build-type:          Simple
 
 source-repository head
@@ -21,7 +19,7 @@
   location: https://github.com/noteed/language-glsl
 
 library
-  build-depends:       base >= 4 && < 5,
+  build-depends:       base < 5,
                        HUnit,
                        parsec,
                        prettyclass
@@ -35,7 +33,7 @@
 executable glsl-pprint
   main-is:             glsl-pprint.hs
   hs-source-dirs:      bin/
-  build-depends:       base >= 4 && < 5,
+  build-depends:       base < 5,
                        HUnit,
                        language-glsl,
                        parsec,