diff --git a/Web/Cookie.hs b/Web/Cookie.hs
--- a/Web/Cookie.hs
+++ b/Web/Cookie.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Web.Cookie
     ( -- * Server to client
@@ -39,7 +40,11 @@
 import Data.Ratio (numerator, denominator)
 import Data.Time (UTCTime (UTCTime), toGregorian, fromGregorian, formatTime, parseTime)
 import Data.Time.Clock (DiffTime, secondsToDiffTime)
+#if MIN_VERSION_time(1, 5, 0)
+import Data.Time (defaultTimeLocale)
+#else
 import System.Locale (defaultTimeLocale)
+#endif
 import Control.Arrow (first)
 import Data.Text (Text)
 import Data.Text.Encoding (encodeUtf8, decodeUtf8With)
diff --git a/cookie.cabal b/cookie.cabal
--- a/cookie.cabal
+++ b/cookie.cabal
@@ -1,5 +1,5 @@
 name:            cookie
-version:         0.4.1.3
+version:         0.4.1.4
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -33,9 +33,9 @@
                  , blaze-builder
                  , bytestring
                  , cookie
-                 , test-framework
-                 , test-framework-hunit
-                 , test-framework-quickcheck2
+                 , tasty
+                 , tasty-hunit
+                 , tasty-quickcheck
                  , text
                  -- Bug in time 1.4.0, see:
                  -- https://github.com/snoyberg/cookie/issues/9
diff --git a/test/Spec.hs b/test/Spec.hs
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -1,6 +1,6 @@
-import Test.Framework (defaultMain)
-import Test.Framework.Providers.QuickCheck2 (testProperty)
-import Test.Framework.Providers.HUnit (testCase)
+import Test.Tasty (defaultMain, testGroup)
+import Test.Tasty.QuickCheck (testProperty)
+import Test.Tasty.HUnit (testCase)
 import Test.QuickCheck
 import Test.HUnit ((@=?), Assertion)
 
@@ -16,7 +16,7 @@
 import qualified Data.Text as T
 
 main :: IO ()
-main = defaultMain
+main = defaultMain $ testGroup "cookie"
     [ testProperty "parse/render cookies" propParseRenderCookies
     , testProperty "parse/render SetCookie" propParseRenderSetCookie
     , testProperty "parse/render cookies text" propParseRenderCookiesText