diff --git a/Text/Press/Types.hs b/Text/Press/Types.hs
--- a/Text/Press/Types.hs
+++ b/Text/Press/Types.hs
@@ -65,8 +65,6 @@
 data Expr = ExprStr String
     | ExprVar String
     | ExprNum Double
-    -- | ExprBinary Op Expr Expr 
-    -- | ExprUnary Op Expr
     deriving (Ord, Eq, Show)
 
 type ParserState = (Parser, Template)
diff --git a/press.cabal b/press.cabal
--- a/press.cabal
+++ b/press.cabal
@@ -1,5 +1,5 @@
 Name:                press
-Version:             0.1.1
+Version:             0.1.2
 Synopsis:            Text template library targeted at the web / HTML generation
 Description:         Press is a general purpose text templating engine that is targeted at generating HTML / Web content.  It uses the same syntax Django/Jinja templates use.
 Category:            Text, Web
@@ -12,5 +12,5 @@
 Cabal-Version:       >= 1.2
 
 Library
-  Build-Depends:     base >= 3 && < 5, containers, mtl, parsec >= 3.0.0, json
+  Build-Depends:     base >= 4 && < 5, containers, mtl, parsec >= 3.0.0, json
   Exposed-Modules:   Text.Press.Render, Text.Press.Parser, Text.Press.Tags, Text.Press.Run, Text.Press.Types