diff --git a/log-warper.cabal b/log-warper.cabal
--- a/log-warper.cabal
+++ b/log-warper.cabal
@@ -1,10 +1,10 @@
 name:                log-warper
-version:             0.4
+version:             0.4.1
 synopsis:            Flexible, configurable, monadic and pretty logging
 homepage:            https://github.com/serokell/log-warper
 license:             MIT
 license-file:        LICENSE
-author:              Serokell team
+author:              Serokell
 maintainer:          Serokell <hi@serokell.io>
 copyright:           2016-2016 Serokell
 category:            Interfaces
diff --git a/test/Test/Wlog/RollingSpec.hs b/test/Test/Wlog/RollingSpec.hs
--- a/test/Test/Wlog/RollingSpec.hs
+++ b/test/Test/Wlog/RollingSpec.hs
@@ -7,7 +7,7 @@
 import           Universum
 
 import           Control.Concurrent.Async (mapConcurrently)
-import           Control.Lens             (zoom, (.=), (?=))
+import           Control.Lens             (zoom, (?=))
 import qualified Prelude                  (read)
 import           System.Directory         (doesFileExist, removeFile)
 import           System.FilePath          (takeExtension)
@@ -67,8 +67,8 @@
 testLogFile = "patak.log"
 
 testLoggerConfig :: RotationParameters -> LoggerConfig
-testLoggerConfig (Just -> rotParam ) = fromScratch $ do
-    lcRotation   .= rotParam
+testLoggerConfig rotParam = fromScratch $ do
+    lcRotation   ?= rotParam
     lcFilePrefix ?= "logs"
     zoom lcTree $ do
         ltSeverity ?= Debug