diff --git a/ert.cabal b/ert.cabal
--- a/ert.cabal
+++ b/ert.cabal
@@ -2,7 +2,7 @@
 -- see http://haskell.org/cabal/users-guide/
 
 name:                ert
-version:             0.0.1.1
+version:             0.0.2.0
 synopsis:            Easy Runtime Templates
 description:         EJS-like template engine for Haskell.
 license:             GPL-3
@@ -45,13 +45,13 @@
   default-extensions:  OverloadedStrings
                        CPP
   -- other-extensions:    
-  build-depends:       base >=4.6 && <4.7
-                     , bytestring >= 0.10.0.2 && < 0.11
-                     , text >= 0.11.3.1 && < 0.12
+  build-depends:       base >= 4.6 && < 4.7
+                     , bytestring >= 0.10.0.2
+                     , text >= 0.11.3.1
                      , vector >= 0.10.0.1 && < 0.11
                      , unordered-containers >= 0.2.3.0 && < 0.3
-                     , aeson >= 0.6.2.1 && < 0.7
-                     , attoparsec >= 0.10.4.0 && < 0.11
+                     , aeson >= 0.8.0.1 && < 0.9
+                     , attoparsec >= 0.11.3.4 && < 0.13
                      , attoparsec-expr >= 0.1.1.1 && < 0.2
   if flag(regex)
     build-depends:     regex-compat >= 0.95.1 && < 0.96
@@ -74,12 +74,12 @@
                        CPP
   build-depends:       base
                      , ert
-                     , bytestring >= 0.10.0.2 && < 0.11
-                     , aeson >= 0.6.2.1 && < 0.7
-                     , attoparsec >= 0.10.4.0 && < 0.11
+                     , bytestring >= 0.10.0.2
+                     , aeson >= 0.8.0.1 && < 0.9
+                     , attoparsec >= 0.10.4.0 && < 0.13
 
   if flag(yaml)
-    build-depends:     yaml >= 0.8.9.1 && < 0.9
+    build-depends:     yaml >= 0.8.9.2 && < 0.9
     cpp-options:       -DWITH_YAML
 
   if flag(dev)
diff --git a/library/Data/EasyTpl/Render.hs b/library/Data/EasyTpl/Render.hs
--- a/library/Data/EasyTpl/Render.hs
+++ b/library/Data/EasyTpl/Render.hs
@@ -218,7 +218,11 @@
 -- | Cast value to boolean.
 toBoolean :: Value -> Value
 toBoolean bool@(Bool _) = bool
+#if MIN_VERSION_attoparsec(0,12,0)
+toBoolean (Number val) = Bool $ val /= 0
+#else
 toBoolean (Number val) = Bool $ val /= I 0
+#endif
 toBoolean (String text) = Bool $ not $ T.null text
 toBoolean Null = Bool False
 toBoolean (Object hash) = Bool $ not $ H.null hash
@@ -229,10 +233,17 @@
 toNumber :: Value -> Value
 toNumber val@(Number _) = val
 toNumber (Bool bool) = Number $ if bool then 1 else 0
+#if MIN_VERSION_attoparsec(0,12,0)
+toNumber (String text) = getNumber' $ AT.parse AT.scientific text
+  where
+    getNumber' (AT.Done _ val) = Number val
+    getNumber' _ = Null
+#else
 toNumber (String text) = getNumber' $ AT.parse AT.number text
   where
     getNumber' (AT.Done _ val) = Number val
     getNumber' _ = Null
+#endif
 toNumber _ = Null
 
 -- | Cast any value to string.