diff --git a/Network/HTTP/Conduit/Cookies.hs b/Network/HTTP/Conduit/Cookies.hs
--- a/Network/HTTP/Conduit/Cookies.hs
+++ b/Network/HTTP/Conduit/Cookies.hs
@@ -1,7 +1,6 @@
 -- | This module implements the algorithms described in RFC 6265 for the Network.HTTP.Conduit library.
 module Network.HTTP.Conduit.Cookies where
 
-import qualified Network.HTTP.Types as W
 import qualified Data.ByteString as BS
 import qualified Data.ByteString.UTF8 as U
 import Text.Regex
@@ -20,7 +19,7 @@
 slash :: Integral a => a
 slash = 47 -- '/'
 
-isIpAddress :: W.Ascii -> Bool
+isIpAddress :: BS.ByteString -> Bool
 isIpAddress a = case strs of
   Just strs' -> helper strs'
   Nothing -> False
@@ -32,7 +31,7 @@
 
 -- | This corresponds to the subcomponent algorithm entitled \"Domain Matching\" detailed
 -- in section 5.1.3
-domainMatches :: W.Ascii -> W.Ascii -> Bool
+domainMatches :: BS.ByteString -> BS.ByteString -> Bool
 domainMatches string domainString
   | string == domainString = True
   | BS.length string < BS.length domainString + 1 = False
@@ -42,7 +41,7 @@
 
 -- | This corresponds to the subcomponent algorithm entitled \"Paths\" detailed
 -- in section 5.1.4
-defaultPath :: Req.Request m -> W.Ascii
+defaultPath :: Req.Request m -> BS.ByteString
 defaultPath req
   | BS.null uri_path = U.fromString "/"
   | BS.singleton (BS.head uri_path) /= U.fromString "/" = U.fromString "/"
@@ -52,7 +51,7 @@
 
 -- | This corresponds to the subcomponent algorithm entitled \"Path-Match\" detailed
 -- in section 5.1.4
-pathMatches :: W.Ascii -> W.Ascii -> Bool
+pathMatches :: BS.ByteString -> BS.ByteString -> Bool
 pathMatches requestPath cookiePath
   | cookiePath == requestPath = True
   | cookiePath `BS.isPrefixOf` requestPath && BS.singleton (BS.last cookiePath) == U.fromString "/" = True
@@ -62,11 +61,11 @@
 
 -- This corresponds to the description of a cookie detailed in Section 5.3 \"Storage Model\"
 data Cookie = Cookie
-  { cookie_name :: W.Ascii
-  , cookie_value :: W.Ascii
+  { cookie_name :: BS.ByteString
+  , cookie_value :: BS.ByteString
   , cookie_expiry_time :: UTCTime
-  , cookie_domain :: W.Ascii
-  , cookie_path :: W.Ascii
+  , cookie_domain :: BS.ByteString
+  , cookie_path :: BS.ByteString
   , cookie_creation_time :: UTCTime
   , cookie_last_access_time :: UTCTime
   , cookie_persistent :: Bool
@@ -123,7 +122,7 @@
 rejectPublicSuffixes :: Bool
 rejectPublicSuffixes = True
 
-isPublicSuffix :: W.Ascii -> Bool
+isPublicSuffix :: BS.ByteString -> Bool
 isPublicSuffix _ = False
 
 -- | This corresponds to the eviction algorithm described in Section 5.3 \"Storage Model\"
@@ -149,7 +148,7 @@
                     -> CookieJar             -- ^ Current cookie jar
                     -> UTCTime               -- ^ Value that should be used as \"now\"
                     -> Bool                  -- ^ Whether or not this request is coming from an \"http\" source (not javascript or anything like that)
-                    -> (W.Ascii, CookieJar)  -- ^ (Contents of a \"Cookie\" header, Updated cookie jar (last-access-time is updated))
+                    -> (BS.ByteString, CookieJar)  -- ^ (Contents of a \"Cookie\" header, Updated cookie jar (last-access-time is updated))
 computeCookieString request cookie_jar now is_http_api = (output_line, cookie_jar')
   where matching_cookie cookie = condition1 && condition2 && condition3 && condition4
           where condition1
diff --git a/Network/HTTP/Conduit/Manager.hs b/Network/HTTP/Conduit/Manager.hs
--- a/Network/HTTP/Conduit/Manager.hs
+++ b/Network/HTTP/Conduit/Manager.hs
@@ -46,7 +46,6 @@
 import Network.Socket (socketToHandle)
 import Data.Certificate.X509 (X509, encodeCertificate)
 
-import qualified Network.HTTP.Types as W
 import Network.TLS.Extra (certificateVerifyChain, certificateVerifyDomain)
 
 import Network.HTTP.Conduit.ConnInfo
@@ -63,7 +62,7 @@
 data ManagerSettings = ManagerSettings
     { managerConnCount :: Int
       -- ^ Number of connections to a single host to keep alive. Default: 10.
-    , managerCheckCerts :: W.Ascii -> [X509] -> IO TLSCertificateUsage
+    , managerCheckCerts :: S8.ByteString -> [X509] -> IO TLSCertificateUsage
       -- ^ Check if the server certificate is valid. Only relevant for HTTPS.
     }
 
@@ -76,7 +75,7 @@
         }
 
 -- | Check certificates using the operating system's certificate checker.
-defaultCheckCerts :: W.Ascii -> [X509] -> IO TLSCertificateUsage
+defaultCheckCerts :: S8.ByteString -> [X509] -> IO TLSCertificateUsage
 defaultCheckCerts host' certs =
     case certificateVerifyDomain (S8.unpack host') certs of
         CertificateUsageAccept -> certificateVerifyChain certs
@@ -89,9 +88,9 @@
     -- ^ @Nothing@ indicates that the manager is closed.
     , mMaxConns :: !Int
     -- ^ This is a per-@ConnKey@ value.
-    , mCheckCerts :: W.Ascii -> [X509] -> IO TLSCertificateUsage
+    , mCheckCerts :: S8.ByteString -> [X509] -> IO TLSCertificateUsage
     -- ^ Check if a certificate is valid.
-    , mCertCache :: !(I.IORef (Map.Map W.Ascii (Map.Map X509Encoded UTCTime)))
+    , mCertCache :: !(I.IORef (Map.Map S8.ByteString (Map.Map X509Encoded UTCTime)))
     -- ^ Cache of validated certificates. The @UTCTime@ gives the expiration
     -- time for the validity of the certificate. The @Ascii@ is the hostname.
     }
@@ -149,7 +148,7 @@
 
 -- | Collect and destroy any stale connections.
 reap :: I.IORef (Maybe (Map.Map ConnKey (NonEmptyList ConnInfo)))
-     -> I.IORef (Map.Map W.Ascii (Map.Map X509Encoded UTCTime))
+     -> I.IORef (Map.Map S8.ByteString (Map.Map X509Encoded UTCTime))
      -> IO ()
 reap mapRef certCacheRef =
     mask_ loop
@@ -394,7 +393,7 @@
             (True, False) -> getSslConn $ checkCerts m h
             (True, True) -> getSslProxyConn (checkCerts m h) h (port req)
 
-checkCerts :: Manager -> W.Ascii -> [X509] -> IO TLSCertificateUsage
+checkCerts :: Manager -> S8.ByteString -> [X509] -> IO TLSCertificateUsage
 checkCerts man host' certs = do
 #if DEBUG
     putStrLn $ "checkCerts for host: " ++ show host'
diff --git a/Network/HTTP/Conduit/Request.hs b/Network/HTTP/Conduit/Request.hs
--- a/Network/HTTP/Conduit/Request.hs
+++ b/Network/HTTP/Conduit/Request.hs
@@ -76,11 +76,11 @@
     -- ^ HTTP request method, eg GET, POST.
     , secure :: Bool
     -- ^ Whether to use HTTPS (ie, SSL).
-    , host :: W.Ascii
+    , host :: S.ByteString
     , port :: Int
-    , path :: W.Ascii
+    , path :: S.ByteString
     -- ^ Everything from the host to the query string.
-    , queryString :: W.Ascii
+    , queryString :: S.ByteString
     , requestHeaders :: W.RequestHeaders
     , requestBody :: RequestBody m
     , proxy :: Maybe Proxy
@@ -122,7 +122,7 @@
 -- | Define a HTTP proxy, consisting of a hostname and port number.
 
 data Proxy = Proxy
-    { proxyHost :: W.Ascii -- ^ The host name of the HTTP proxy.
+    { proxyHost :: S.ByteString -- ^ The host name of the HTTP proxy.
     , proxyPort :: Int -- ^ The port number of the HTTP proxy.
     }
 
diff --git a/http-conduit.cabal b/http-conduit.cabal
--- a/http-conduit.cabal
+++ b/http-conduit.cabal
@@ -1,5 +1,5 @@
 name:            http-conduit
-version:         1.5.0
+version:         1.5.0.1
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -30,7 +30,7 @@
                  , attoparsec            >= 0.8.0.2 && < 0.11
                  , utf8-string           >= 0.3.4   && < 0.4
                  , blaze-builder         >= 0.2.1   && < 0.4
-                 , http-types            >= 0.6     && < 0.7
+                 , http-types            >= 0.6     && < 0.8
                  , cprng-aes             >= 0.2     && < 0.3
                  , tls                   >= 0.9.3   && < 0.10
                  , tls-extra             >= 0.4.5   && < 0.5