diff --git a/amazonka.cabal b/amazonka.cabal
--- a/amazonka.cabal
+++ b/amazonka.cabal
@@ -1,5 +1,5 @@
 name:                  amazonka
-version:               0.0.0
+version:               0.0.1
 synopsis:              Comprehensive Amazon Web Services SDK
 homepage:              https://github.com/brendanhay/amazonka
 license:               OtherLicense
@@ -34,7 +34,7 @@
         , Network.AWS
 
     build-depends:
-          amazonka-core     == 0.0.*
+          amazonka-core     == 0.0.1.*
         , base              >= 4.7     && < 5
         , conduit           >= 1.1     && < 1.3
         , exceptions        == 0.6.*
diff --git a/src/Control/Monad/Trans/AWS.hs b/src/Control/Monad/Trans/AWS.hs
--- a/src/Control/Monad/Trans/AWS.hs
+++ b/src/Control/Monad/Trans/AWS.hs
@@ -329,6 +329,6 @@
            )
         => a       -- ^ Request to presign.
         -> UTCTime -- ^ Signing time.
-        -> Int     -- ^ Expiry time in seconds.
+        -> UTCTime -- ^ Expiry time.
         -> m (Signed a (Sg (Sv a)))
 presign rq t x = scoped (\e -> AWS.presign e rq t x)
diff --git a/src/Network/AWS.hs b/src/Network/AWS.hs
--- a/src/Network/AWS.hs
+++ b/src/Network/AWS.hs
@@ -142,6 +142,6 @@
         => Env
         -> a       -- ^ Request to presign.
         -> UTCTime -- ^ Signing time.
-        -> Int     -- ^ Expiry time in seconds.
+        -> UTCTime -- ^ Expiry time.
         -> m (Signed a (Sg (Sv a)))
 presign Env{..} (request -> rq) = Sign.presign _envAuth _envRegion rq