diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,10 +1,19 @@
 # ChangeLog / ReleaseNotes
 
 
+## Version 0.2.2.0
+
+* Relaxed `data-default-class` dependency that allows bilding with version
+  0.1.\*.
+* Introducing functions:
+    * `increment :: Verbosity -> Maybe Verbosity`
+    * `increment' :: Verbosity -> Verbosity`
+
 ## Version 0.2.1.0
 
 * Introducing optional instance for cereal's `Serialize` type class. Dependency
   on `cereal` package can be enabled using `-fcereal` build flag. (new)
+* Uploaded to [Hackage][]: <http://hackage.haskell.org/package/verbosity-0.2.1.0>
 
 
 ## Version 0.2.0.0
diff --git a/src/Data/Verbosity.hs b/src/Data/Verbosity.hs
--- a/src/Data/Verbosity.hs
+++ b/src/Data/Verbosity.hs
@@ -16,7 +16,7 @@
 -- |
 -- Module:       $HEADER$
 -- Description:  Verbosity enum.
--- Copyright:    (c) 2015, Peter Trško
+-- Copyright:    (c) 2015-2016 Peter Trško
 -- License:      BSD3
 --
 -- Maintainer:   peter.trsko@gmail.com
@@ -27,6 +27,8 @@
 -- Simple enum that encodes application 'Verbosity'.
 module Data.Verbosity
     ( Verbosity(..)
+    , increment
+    , increment'
     , fromInt
 #ifdef DERIVE_DATA_TYPEABLE
     , parse
@@ -36,7 +38,7 @@
 
 import Prelude
     ( Bounded(maxBound, minBound)
-    , Enum(fromEnum, toEnum)
+    , Enum(fromEnum, succ, toEnum)
 #ifdef DECLARE_BINARY_INSTANCE
     , fromIntegral
 #endif
@@ -45,7 +47,7 @@
 import Data.Bool ((&&), otherwise)
 import Data.Eq (Eq)
 import Data.Int (Int)
-import Data.Maybe (Maybe(..))
+import Data.Maybe (Maybe(..), fromMaybe)
 import Data.Ord (Ord(..))
 import Text.Read (Read)
 import Text.Show (Show)
@@ -143,6 +145,22 @@
 instance NFData Verbosity where
     rnf !_ = ()
 #endif
+
+-- | Increment verbosity level. Return 'Nothing' if trying to icrement beyond
+-- 'maxBound'.
+increment :: Verbosity -> Maybe Verbosity
+increment v
+  | v < maxBound = Just (succ v)
+  | otherwise    = Nothing
+
+-- | Variant of 'increment' that doesn't fail when 'maxBound' is reached. It
+-- is defined as:
+--
+-- @
+-- 'increment'' v = 'fromMaybe' v ('increment' v)
+-- @
+increment' :: Verbosity -> Verbosity
+increment' v = fromMaybe v (increment v)
 
 -- | Safe version of 'toEnum' specialized to 'Verbosity'.
 fromInt :: Int -> Maybe Verbosity
diff --git a/verbosity.cabal b/verbosity.cabal
--- a/verbosity.cabal
+++ b/verbosity.cabal
@@ -1,5 +1,5 @@
 name:                   verbosity
-version:                0.2.1.0
+version:                0.2.2.0
 synopsis:               Simple enum that encodes application verbosity.
 description:
   Simple enum that encodes application verbosity with various useful instances.
@@ -10,7 +10,7 @@
 license-file:           LICENSE
 author:                 Peter Trško
 maintainer:             peter.trsko@gmail.com
-copyright:              (c) 2015, Peter Trško
+copyright:              (c) 2015-2016 Peter Trško
 category:               Data
 build-type:             Simple
 cabal-version:          >=1.10
@@ -99,7 +99,7 @@
     cpp-options:        -DDECLARE_BINARY_INSTANCE
 
   if flag(data-default)
-    build-depends:      data-default-class ==0.0.*
+    build-depends:      data-default-class ==0.0.* || ==0.1.*
     cpp-options:        -DDECLARE_DEFAULT_INSTANCE
 
   if flag(deepseq)
@@ -118,4 +118,4 @@
 source-repository this
   type:                 git
   location:             git://github.com/trskop/verbosity.git
-  tag:                  v0.2.1.0
+  tag:                  0.2.2.0