diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,24 @@
+0.3.1
+=====
+
+*   Add support for tasty-hunit >= 0.10.
+
+*   Raise lower bounds on some dependencies:
+    *   base >= 4.8
+    *   deepseq >= 1.4
+    *   aeson >= 0.11
+    *   time >= 1.5
+
+*   Require Cabal >= 1.22.
+
+*   Drop support for GHC < 7.10.
+
 0.3.0
 =====
 
 *   Remove `EitherT` instance. It's recommended to use `ExceptT` instead.
 
-*   Remove `TraceT` instace. It's not actively maintained any more.
+*   Remove `TraceT` instance. It's not actively maintained any more.
 
 *   Support aeson >= 0.11, which comes with instances for `Natural`.
 
diff --git a/constraints b/constraints
deleted file mode 100644
--- a/constraints
+++ /dev/null
@@ -1,104 +0,0 @@
-constraints: Cabal ==1.23.1.0,
-             StateVar ==1.1.0.3,
-             adjunctions ==4.3,
-             aeson ==0.11.0.0,
-             ansi-terminal ==0.6.2.3,
-             ansi-wl-pprint ==0.6.7.3,
-             array ==0.5.1.0,
-             asn1-encoding ==0.9.3,
-             asn1-parse ==0.9.4,
-             asn1-types ==0.3.2,
-             async ==2.1.0,
-             attoparsec ==0.13.0.1,
-             base ==4.8.2.0,
-             base-orphans ==0.5.0,
-             base-unicode-symbols ==0.2.2.4,
-             base64-bytestring ==1.0.0.1,
-             bifunctors ==5.2,
-             binary ==0.7.5.0,
-             blaze-builder ==0.4.0.1,
-             byteable ==0.1.1,
-             bytestring ==0.10.6.0,
-             case-insensitive ==1.2.0.6,
-             cereal ==0.5.1.0,
-             clock ==0.6.0.1,
-             comonad ==5,
-             conduit ==1.2.6.1,
-             configuration-tools ==0.2.14,
-             connection ==0.2.5,
-             containers ==0.5.6.2,
-             contravariant ==1.4,
-             cookie ==0.4.1.6,
-             cryptonite ==0.13,
-             data-default ==0.5.3,
-             data-default-class ==0.0.1,
-             data-default-instances-base ==0.0.1,
-             data-default-instances-containers ==0.0.1,
-             data-default-instances-dlist ==0.0.1,
-             data-default-instances-old-locale ==0.0.1,
-             deepseq ==1.4.1.1,
-             directory ==1.2.2.0,
-             distributive ==0.5.0.2,
-             dlist ==0.7.1.2,
-             enclosed-exceptions ==1.0.1.1,
-             exceptions ==0.8.2.1,
-             fail ==4.9.0.0,
-             filepath ==1.4.0.0,
-             free ==4.12.4,
-             ghc-prim ==0.4.0.0,
-             hashable ==1.2.4.0,
-             hourglass ==0.2.9,
-             http-client ==0.4.27,
-             http-client-tls ==0.2.2,
-             http-types ==0.9,
-             integer-gmp ==1.0.0.0,
-             kan-extensions ==5.0.1,
-             lens ==4.13.2.1,
-             lifted-base ==0.2.3.6,
-             memory ==0.11,
-             mime-types ==0.1.0.6,
-             mmorph ==1.0.5,
-             monad-control ==1.0.0.4,
-             mtl ==2.2.1,
-             network ==2.6.2.1,
-             network-uri ==2.6.0.3,
-             old-locale ==1.0.0.7,
-             optparse-applicative ==0.12.1.0,
-             parallel ==3.2.1.0,
-             parsec ==3.1.9,
-             pem ==0.2.2,
-             prelude-extras ==0.4.0.3,
-             pretty ==1.1.2.0,
-             primitive ==0.6.1.0,
-             process ==1.2.3.0,
-             profunctors ==5.2,
-             random ==1.1,
-             reflection ==2.1.2,
-             resourcet ==1.1.7,
-             rts ==1.0,
-             scientific ==0.3.4.4,
-             semigroupoids ==5.0.1,
-             semigroups ==0.18.0.1,
-             socks ==0.5.4,
-             stm ==2.4.4.1,
-             stm-chans ==3.0.0.4,
-             streaming-commons ==0.1.15,
-             syb ==0.6,
-             tagged ==0.8.2,
-             template-haskell ==2.10.0.0,
-             text ==1.2.2.0,
-             time ==1.5.0.1,
-             tls ==1.3.4,
-             transformers ==0.4.2.0,
-             transformers-base ==0.4.4,
-             transformers-compat ==0.4.0.4,
-             unix ==2.7.1.0,
-             unordered-containers ==0.2.6.0,
-             vector ==0.11.0.0,
-             void ==0.7.1,
-             x509 ==1.6.3,
-             x509-store ==1.6.1,
-             x509-system ==1.6.3,
-             x509-validation ==1.6.3,
-             yaml ==0.8.16,
-             zlib ==0.6.1.1
diff --git a/src/System/Logger/Backend/ColorOption.hs b/src/System/Logger/Backend/ColorOption.hs
--- a/src/System/Logger/Backend/ColorOption.hs
+++ b/src/System/Logger/Backend/ColorOption.hs
@@ -1,3 +1,4 @@
+-- Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
 -- Copyright (c) 2014-2015 PivotCloud, Inc.
 --
 -- System.Logger.Backend.ColorOption
@@ -18,9 +19,11 @@
 
 -- |
 -- Module: System.Logger.Backend.ColorOption
--- Copyright: Copyright (c) 2014-2015 PivotCloud, Inc.
+-- Copyright:
+--     Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
+--     Copyright (c) 2014-2015 PivotCloud, Inc.
 -- License: Apache License, Version 2.0
--- Maintainer: Lars Kuhtz <lkuhtz@pivotmail.com>
+-- Maintainer: Lars Kuhtz <lakuhtz@gmail.com>
 -- Stability: experimental
 --
 -- An option that indicates whether ANSI color escapes shall
@@ -29,7 +32,6 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE UnicodeSyntax #-}
@@ -44,19 +46,12 @@
 , useColor
 ) where
 
-#ifndef MIN_VERSION_base
-#define MIN_VERSION_base(x,y,z) 1
-#endif
-
 import Configuration.Utils
 
 import Control.DeepSeq
 import Control.Monad.Except
 
 import qualified Data.CaseInsensitive as CI
-#if ! MIN_VERSION_base(4,8,0)
-import Data.Monoid
-#endif
 import Data.Monoid.Unicode
 import Data.String
 import qualified Data.Text as T
diff --git a/src/System/Logger/Backend/Handle.hs b/src/System/Logger/Backend/Handle.hs
--- a/src/System/Logger/Backend/Handle.hs
+++ b/src/System/Logger/Backend/Handle.hs
@@ -1,3 +1,4 @@
+-- Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
 -- Copyright (c) 2014-2015 PivotCloud, Inc.
 --
 -- System.Logger.Backend.Handle
@@ -19,9 +20,11 @@
 -- |
 -- Module: System.Logger.Backend.Handle
 -- Description: Handle Backend for Yet Another Logger
--- Copyright: Copyright (c) 2014-2015 PivotCloud, Inc.
+-- Copyright:
+--     Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
+--     Copyright (c) 2014-2015 PivotCloud, Inc.
 -- License: Apache License, Version 2.0
--- Maintainer: Lars Kuhtz <lkuhtz@pivotmail.com>
+-- Maintainer: Lars Kuhtz <lakuhtz@gmail.com>
 -- Stability: experimental
 --
 
@@ -31,7 +34,6 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE RecordWildCards #-}
-{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE UnicodeSyntax #-}
@@ -62,10 +64,6 @@
 , handleBackend_
 ) where
 
-#ifndef MIN_VERSION_deepseq
-#define MIN_VESION_deepseq(a,b,c) 1
-#endif
-
 import Configuration.Utils hiding (Lens', Error)
 import Configuration.Utils.Validation
 
@@ -176,12 +174,7 @@
 handleBackendConfigHandle ∷ Lens' HandleBackendConfig LoggerHandleConfig
 handleBackendConfigHandle = lens _handleBackendConfigHandle $ \a b → a { _handleBackendConfigHandle = b }
 
-#if MIN_VERSION_deepseq(1,4,0)
 instance NFData HandleBackendConfig
-#else
-instance NFData HandleBackendConfig where
-    rnf (HandleBackendConfig a0 a1) = rnf a0 `seq` rnf a1
-#endif
 
 defaultHandleBackendConfig ∷ HandleBackendConfig
 defaultHandleBackendConfig = HandleBackendConfig
diff --git a/src/System/Logger/Internal.hs b/src/System/Logger/Internal.hs
--- a/src/System/Logger/Internal.hs
+++ b/src/System/Logger/Internal.hs
@@ -1,7 +1,7 @@
 -- |
 -- Module: System.Logger.Internal
 -- Copyright:
---     Copyright (c) 2016 Lars Kuhtz <lakuhtz@gmail.com>
+--     Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
 --     Copyright (c) 2014-2015 PivotCloud, Inc.
 -- License: Apache License, Version 2.0
 -- Maintainer: Lars Kuhtz <lakuhtz@gmail.com>
@@ -19,10 +19,6 @@
 , timeSpecToUtc
 ) where
 
-#ifndef MIN_VERSION_time
-#define MIN_VERSION_time(a,b,c) 1
-#endif
-
 import Data.Monoid.Unicode
 import Data.Time.Clock
 import Data.Time.Clock.POSIX
@@ -34,10 +30,6 @@
 import Prelude.Unicode
 
 import System.Clock
-
-#if !MIN_VERSION_time(1,5,0)
-import System.Locale (defaultTimeLocale)
-#endif
 
 sshow
     ∷ (Show a, IsString b)
diff --git a/src/System/Logger/Internal/Queue.hs b/src/System/Logger/Internal/Queue.hs
--- a/src/System/Logger/Internal/Queue.hs
+++ b/src/System/Logger/Internal/Queue.hs
@@ -1,3 +1,4 @@
+-- Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
 -- Copyright (c) 2014-2015 PivotCloud, Inc.
 --
 -- System.Logger
@@ -19,9 +20,11 @@
 -- |
 -- Module: System.Logger.Internal.Queue
 -- Description: Queues for Usage with Yet Another Logger
--- Copyright: Copyright © 2015 PivotCloud, Inc.
+-- Copyright:
+--     Copyright © 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
+--     Copyright © 2015 PivotCloud, Inc.
 -- License: Apache-2.0
--- Maintainer: Lars Kuhtz <lkuhtz@pivotmail.com>
+-- Maintainer: Lars Kuhtz <lakuhtz@gmail.com>
 -- Stability: experimental
 --
 
@@ -31,7 +34,6 @@
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE UnicodeSyntax #-}
 
@@ -42,13 +44,6 @@
 , TBMChan
 ) where
 
-#ifndef MIN_VERSION_base
-#define MIN_VERSION_base(x,y,z) = 1
-#endif
-
-#if ! MIN_VERSION_base(4,8,0)
-import Control.Applicative
-#endif
 import Control.Concurrent
 import Control.Concurrent.STM
 import Control.Concurrent.STM.TBMChan
diff --git a/src/System/Logger/Logger/Internal.hs b/src/System/Logger/Logger/Internal.hs
--- a/src/System/Logger/Logger/Internal.hs
+++ b/src/System/Logger/Logger/Internal.hs
@@ -1,3 +1,4 @@
+-- Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
 -- Copyright (c) 2014-2015 PivotCloud, Inc.
 --
 -- System.Logger.Logger.Internal
@@ -19,9 +20,11 @@
 -- |
 -- Module: System.Logger.Logger.Internal
 -- Description: Yet Another Logger Implementation
--- Copyright: Copyright (c) 2014-2015 PivotCloud, Inc.
+-- Copyright:
+--     Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
+--     Copyright (c) 2014-2015 PivotCloud, Inc.
 -- License: Apache License, Version 2.0
--- Maintainer: Lars Kuhtz <lkuhtz@pivotmail.com>
+-- Maintainer: Lars Kuhtz <lakuhtz@gmail.com>
 -- Stability: experimental
 --
 -- This module provides a logger that implements the logger interface
@@ -79,18 +82,6 @@
 , runLogT
 ) where
 
-#ifndef MIN_VERSION_base
-#define MIN_VERSION_base(a,b,c) 1
-#endif
-
-#ifndef MIN_VERSION_deepseq
-#define MIN_VERSION_deepseq(a,b,c) 1
-#endif
-
-#ifndef MIN_VERSION_aeson
-#define MIN_VERSION_aeson(a,b,c) 1
-#endif
-
 import Configuration.Utils hiding (Lens', Error)
 
 import Control.Concurrent (threadDelay)
@@ -128,24 +119,7 @@
 import System.Logger.Internal.Queue
 import System.Logger.Types
 
-#if ! MIN_VERSION_aeson(0,11,1) && ! ( MIN_VERSION_base(4,8,0) && MIN_VERSION_aeson(0,11,0) )
-
 -- -------------------------------------------------------------------------- --
--- Orphans
-
-instance ToJSON Natural where
-    toJSON = Number ∘ fromIntegral
-
-instance FromJSON Natural where
-    parseJSON = withScientific "Natural" $ \n →
-        if n < 0
-          then fail $ "expected a natural number but got " ⊕ show n
-          else pure $ floor n
-          -- this seems a little odd but corresponds to all other aeson
-          -- instances for integral types
-#endif
-
--- -------------------------------------------------------------------------- --
 -- Logger Configuration
 
 -- | Logger Configuration
@@ -203,18 +177,7 @@
 loggerConfigExitTimeout ∷ Lens' LoggerConfig (Maybe Natural)
 loggerConfigExitTimeout = lens _loggerConfigExitTimeout $ \a b → a { _loggerConfigExitTimeout = b }
 
-#if ! MIN_VERSION_deepseq(1,4,0) || ! MIN_VERSION_base(4,8,0)
-instance NFData Natural where
-    rnf a = a `seq` ()
-#endif
-
-#if MIN_VERSION_deepseq(1,4,0)
 instance NFData LoggerConfig
-#else
-instance NFData LoggerConfig where
-    rnf (LoggerConfig a0 a1 a2 a3 a4 a5 a6) =
-        rnf a0 `seq` rnf a1 `seq` rnf a2 `seq` rnf a3 `seq` rnf a4 `seq` rnf a5 `seq` rnf a6
-#endif
 
 -- | Default Logger configuration
 --
diff --git a/src/System/Logger/Types.hs b/src/System/Logger/Types.hs
--- a/src/System/Logger/Types.hs
+++ b/src/System/Logger/Types.hs
@@ -1,3 +1,4 @@
+-- Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
 -- Copyright (c) 2014-2015 PivotCloud, Inc.
 --
 -- System.Logger.Types
@@ -19,9 +20,11 @@
 -- |
 -- Module: System.Logger.Types
 -- Description: Basic Types of Yet Another Logger
--- Copyright: Copyright (c) 2014-2015 PivotCloud, Inc.
+-- Copyright:
+--     Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
+--     Copyright (c) 2014-2015 PivotCloud, Inc.
 -- License: Apache License, Version 2.0
--- Maintainer: Lars Kuhtz <lkuhtz@pivotmail.com>
+-- Maintainer: Lars Kuhtz <lakuhtz@gmail.com>
 -- Stability: experimental
 --
 
@@ -37,7 +40,6 @@
 {-# LANGUAGE FunctionalDependencies #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE UndecidableInstances #-}
 {-# LANGUAGE UnicodeSyntax #-}
@@ -90,10 +92,6 @@
 
 ) where
 
-#ifndef MIN_VERSION_deepseq
-#define MIN_VESION_deepseq(a,b,c) 1
-#endif
-
 import Configuration.Utils hiding (Lens, Lens', Error)
 
 import Control.DeepSeq
@@ -315,16 +313,8 @@
 logMsgTime ∷ Lens' (LogMessage a) TimeSpec
 logMsgTime = lens _logMsgTime $ \a b → a { _logMsgTime = b }
 
-#if MIN_VERSION_deepseq(1,4,0)
 instance NFData TimeSpec
 instance NFData a ⇒ NFData (LogMessage a)
-#else
-instance NFData TimeSpec where
-    rnf (TimeSpec a0 a1) = rnf a0 `seq` rnf a1
-instance NFData a ⇒ NFData (LogMessage a) where
-    rnf (LogMessage a0 a1 a2 a3) =
-        rnf a0 `seq` rnf a1 `seq` rnf a2 `seq` rnf a3
-#endif
 
 -- | This is given to logger when it is created. It formats and delivers
 -- individual log messages synchronously. The backend is called once for each
diff --git a/test/NoBackend.hs b/test/NoBackend.hs
--- a/test/NoBackend.hs
+++ b/test/NoBackend.hs
@@ -128,7 +128,7 @@
     tc args = testCaseSteps (sshow args) $ \logLogStr →
         catchAny
             (noBackendLoggerTest logLogStr args)
-            (\e → assertString $ "unexpected exception: " ⊕ show e)
+            (\e → assertFailure $ "unexpected exception: " ⊕ show e)
 
 -- Buggy Backend that calls 'BackendTerminatedException'.
 --
@@ -139,7 +139,7 @@
     tc args = testCaseSteps (sshow args) $ \logLogStr →
         do
             buggyBackendLoggerTest exception (\x → x `mod` m <= n) logLogStr args
-            assertString $ "Missing expected exception"
+            assertFailure "Missing expected exception"
         `catch` \(e ∷ LoggerException Void) → case e of
             BackendTerminatedException e0 → case fromException e0 of
                 Just BuggyBackendException → logLogStr $ "test: expected exception: " ⊕ sshow e
@@ -159,7 +159,7 @@
         do
             buggyBackendLoggerTest exception (\x → x `mod` n <= m) logLogStr args
         `catchAny` \e →
-            assertString $ "test: unexpected exception: " ⊕ show e
+            assertFailure $ "test: unexpected exception: " ⊕ show e
     exception = BuggyBackendException
 
 -- | Buggy Backend that calls some exception.
@@ -176,7 +176,7 @@
             -- Make sure to configure the exitWait and exceptionWait so that
             -- the backend has enough time to deliver enough messages to trigger
             -- and exception.
-            assertString $ "Missing expected exception: " ⊕ sshow exception
+            assertFailure $ "Missing expected exception: " ⊕ sshow exception
         `catch` \(e ∷ LoggerException Void) → case e of
             BackendTooManyExceptions (e0:_) → case fromException e0 of
                 Just BuggyBackendException → logLogStr $ "test: expected exception: " ⊕ sshow e
diff --git a/test/TastyTools.hs b/test/TastyTools.hs
--- a/test/TastyTools.hs
+++ b/test/TastyTools.hs
@@ -1,3 +1,4 @@
+-- Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
 -- Copyright (c) 2013-2015 PivotCloud, Inc. All Rights Reserved.
 --
 -- NOTICE: The dissemination, reproduction, or copying of this file and the
@@ -8,9 +9,11 @@
 
 -- |
 -- Module: TastyTools
--- Copyright: Copyright (c) 2013-2015 PivotCloud, Inc. All Rights Reserved.
+-- Copyright:
+--     Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
+--     Copyright (c) 2013-2015 PivotCloud, Inc. All Rights Reserved.
 -- License: All Rights Reserved, see LICENSE file of the package
--- Maintainer: code@pivotmail.com
+-- Maintainer: Lars Kuhtz <lakuhtz@gmail>
 -- Stability: experimental
 --
 
@@ -32,15 +35,8 @@
 , testCaseSteps
 ) where
 
-#ifndef MIN_VERSION_base
-#define MIN_VESION_base(x,y,z) 1
-#endif
-
 import Configuration.Utils (boolReader)
 
-#if ! MIN_VERSION_base(4,8,0)
-import Control.Applicative
-#endif
 import Control.Exception (try)
 import Control.Monad
 import Control.Monad.IO.Class
@@ -88,13 +84,13 @@
     run opts (TestCaseProgress testAssertion) prog = do
         outRef ← newIORef ""
         try (testAssertion $ step outRef) >>= \case
-            Left (HUnitFailure errMsg) → if verbose
+            Left e@HUnitFailure{} → if verbose
               then do
                 output ← readIORef outRef
                 return ∘ testFailed ∘ LT.unpack ∘ LT.toLazyText $
-                    output ⊕ "\n" ⊕ LT.fromString errMsg
+                    output ⊕ "\n" ⊕ LT.fromString (show e)
               else
-                return ∘ testFailed $ errMsg
+                return ∘ testFailed $ show e
             Right () → if verbose
                 then
                     testPassed ∘ LT.unpack ∘ LT.toLazyText <$> readIORef outRef
diff --git a/yet-another-logger.cabal b/yet-another-logger.cabal
--- a/yet-another-logger.cabal
+++ b/yet-another-logger.cabal
@@ -1,5 +1,6 @@
+Cabal-version: 1.22
 Name: yet-another-logger
-Version: 0.3.0
+Version: 0.3.1
 Synopsis: Yet Another Logger
 Description:
     A logging framework written with flexibility and performance
@@ -53,20 +54,16 @@
 Author: Lars Kuhtz <lakuhtz@gmail.com>
 Maintainer: Lars Kuhtz <lakuhtz@gmail.com>
 Copyright:
-    Copyright (c) 2016 Lars Kuhtz <lakuhtz@gmail.com>
+    Copyright (c) 2016-2018 Lars Kuhtz <lakuhtz@gmail.com>
     Copyright (c) 2014-2015 PivotCloud, Inc.
 Category: Logging, System
 Build-type: Simple
-Cabal-version: >= 1.18
 License-file: LICENSE
 
 extra-doc-files:
     README.md,
     CHANGELOG.md
 
-extra-source-files:
-    constraints
-
 source-repository head
     type: git
     location: https://github.com/alephcloud/hs-yet-another-logger
@@ -75,11 +72,7 @@
     type: git
     location: https://github.com/alephcloud/hs-yet-another-logger
     branch: master
-    tag: 0.3.0
-
-flag old-time
-    manual: False
-    default: False
+    tag: 0.3.1
 
 Library
     default-language: Haskell2010
@@ -97,15 +90,15 @@
 
     build-depends:
         async >= 2.0,
-        aeson >= 0.7,
+        aeson >= 0.11,
         ansi-terminal >= 0.6,
-        base == 4.*,
+        base >= 4.8 && < 5.0,
         base-unicode-symbols >= 0.2,
         bytestring >= 0.10,
         case-insensitive >= 1.2,
         clock >= 0.4,
         configuration-tools >= 0.2.8,
-        deepseq >= 1.3,
+        deepseq >= 1.4,
         enclosed-exceptions >= 1.0,
         exceptions >= 0.8,
         lens >= 4.6,
@@ -116,23 +109,11 @@
         stm >= 2.4,
         stm-chans >= 3.0,
         text >= 1.2,
-        time >= 1.4,
+        time >= 1.5,
         transformers >= 0.3,
         transformers-base >= 0.4,
         void >= 0.7
 
-    if !impl(ghc>=7.9)
-        build-depends:
-            nats >= 1
-
-    if flag(old-time)
-        build-depends:
-            old-locale >= 1.0,
-            time >= 1.4 && < 1.5
-    else
-        build-depends:
-            time >= 1.5
-
     ghc-options: -Wall
 
 test-suite tests
@@ -147,7 +128,7 @@
 
     build-depends:
         async >= 2.0,
-        base == 4.*,
+        base >= 4.8 && < 5.0,
         base-unicode-symbols >= 0.2,
         configuration-tools >= 0.2.12,
         enclosed-exceptions >= 1.0,
@@ -174,6 +155,6 @@
     main-is: Example.hs
 
     build-depends:
-        base == 4.*,
+        base >= 4.8 && < 5.0,
         Cabal >= 1.18,
         yet-another-logger
