diff --git a/deploy/services-demo/conf/nginz/nginx.conf b/deploy/services-demo/conf/nginz/nginx.conf
index 0b86eb2c1b..25317c07ae 100644
--- a/deploy/services-demo/conf/nginz/nginx.conf
+++ b/deploy/services-demo/conf/nginz/nginx.conf
@@ -194,7 +194,7 @@ http {
         proxy_pass http://brig;
     }
 
-    location /register {
+    location ~* (/v[0-9]+)?/register {
       include common_response_no_zauth.conf;
       proxy_pass http://brig;
     }
diff --git a/libs/wire-api/src/Wire/API/Routes/Version.hs b/libs/wire-api/src/Wire/API/Routes/Version.hs
index 03cd25604e..14954596b4 100644
--- a/libs/wire-api/src/Wire/API/Routes/Version.hs
+++ b/libs/wire-api/src/Wire/API/Routes/Version.hs
@@ -32,6 +32,9 @@ where
 import Control.Lens ((?~))
 import Data.Aeson (FromJSON, ToJSON (..))
 import qualified Data.Aeson as Aeson
+import Data.Attoparsec.ByteString.Char8
+import Data.ByteString.Builder
+import Data.ByteString.Conversion
 import Data.Domain
 import Data.Schema
 import qualified Data.Swagger as S
@@ -47,12 +50,24 @@ data Version = V0 | V1
   deriving stock (Eq, Ord, Bounded, Enum, Show)
   deriving (FromJSON, ToJSON) via (Schema Version)
 
+versionNumber :: Version -> Integer
+versionNumber V0 = 0
+versionNumber V1 = 1
+
 instance ToSchema Version where
   schema =
-    enum @Integer "Version" . mconcat $
-      [ element 0 V0,
-        element 1 V1
-      ]
+    enum @Integer "Version" $
+      foldMap
+        (\v -> element (versionNumber v) v)
+        [minBound .. maxBound]
+
+instance FromByteString Version where
+  parser =
+    maybe (fail "Unsupported version") pure
+      =<< fmap mkVersion decimal
+
+instance ToByteString Version where
+  builder = integerDec . versionNumber
 
 readVersionNumber :: Text -> Maybe Integer
 readVersionNumber v = do
diff --git a/libs/wire-api/src/Wire/API/Routes/Version/Wai.hs b/libs/wire-api/src/Wire/API/Routes/Version/Wai.hs
index b0ba0c2ef8..0c65e4a3cf 100644
--- a/libs/wire-api/src/Wire/API/Routes/Version/Wai.hs
+++ b/libs/wire-api/src/Wire/API/Routes/Version/Wai.hs
@@ -17,6 +17,7 @@
 
 module Wire.API.Routes.Version.Wai where
 
+import Data.ByteString.Conversion
 import qualified Data.Text.Lazy as LText
 import Imports
 import qualified Network.HTTP.Types as HTTP
@@ -44,4 +45,12 @@ parseVersion req = do
     [] -> Nothing
     (x : xs) -> pure (x, xs)
   n <- readVersionNumber version
-  pure (rewriteRequestPure (\(_, q) _ -> (pinfo, q)) req, n)
+  let req' =
+        rewriteRequestPure
+          (\(_, q) _ -> (pinfo, q))
+          req
+            { requestHeaders =
+                requestHeaders req
+                  <> [("Wire-API-Version", toByteString' n)]
+            }
+  pure (req', n)
diff --git a/services/brig/src/Brig/API/Public.hs b/services/brig/src/Brig/API/Public.hs
index afffe05776..1d4d1d84fc 100644
--- a/services/brig/src/Brig/API/Public.hs
+++ b/services/brig/src/Brig/API/Public.hs
@@ -366,7 +366,8 @@ sitemap = do
   -- - UserActivated event to created user, if it is a team invitation or user has an SSO ID
   -- - UserIdentityUpdated event to created user, if email code or phone code is provided
   post "/register" (continue createUserH) $
-    accept "application" "json"
+    opt (header "Wire-API-Version")
+      .&. accept "application" "json"
       .&. jsonRequest @Public.NewUserPublic
   document "POST" "register" $ do
     Doc.summary "Register a new user."
@@ -669,10 +670,10 @@ getClientPrekeys :: UserId -> ClientId -> (Handler r) [Public.PrekeyId]
 getClientPrekeys usr clt = lift (API.lookupPrekeyIds usr clt)
 
 -- docs/reference/user/registration.md {#RefRegistration}
-createUserH :: JSON ::: JsonRequest Public.NewUserPublic -> (Handler r) Response
-createUserH (_ ::: req) = do
+createUserH :: Maybe Version ::: JSON ::: JsonRequest Public.NewUserPublic -> (Handler r) Response
+createUserH (v ::: _ ::: req) = do
   CreateUserResponse cok loc prof <- createUser =<< parseJsonBody req
-  lift . Auth.setResponseCookie cok
+  lift . Auth.setResponseCookie v cok
     . setStatus status201
     . addHeader "Location" (toByteString' loc)
     $ json prof
diff --git a/services/brig/src/Brig/User/API/Auth.hs b/services/brig/src/Brig/User/API/Auth.hs
index fdd67fd5fd..d2b217215e 100644
--- a/services/brig/src/Brig/User/API/Auth.hs
+++ b/services/brig/src/Brig/User/API/Auth.hs
@@ -55,6 +55,7 @@ import qualified Network.Wai.Utilities.Response as WaiResp
 import Network.Wai.Utilities.Swagger (document)
 import qualified Network.Wai.Utilities.Swagger as Doc
 import Wire.API.ErrorDescription
+import Wire.API.Routes.Version
 import qualified Wire.API.User as Public
 import Wire.API.User.Auth as Public
 import Wire.Swagger as Doc (pendingLoginError)
@@ -62,7 +63,8 @@ import Wire.Swagger as Doc (pendingLoginError)
 routesPublic :: Routes Doc.ApiBuilder (Handler r) ()
 routesPublic = do
   post "/access" (continue renewH) $
-    accept "application" "json"
+    opt (header "Wire-API-Version")
+      .&. accept "application" "json"
       .&. tokenRequest
   document "POST" "newAccessToken" $ do
     Doc.summary "Obtain an access tokens for a cookie."
@@ -101,7 +103,8 @@ routesPublic = do
     Doc.errorResponse' loginCodePending Doc.pendingLoginError
 
   post "/login" (continue loginH) $
-    jsonRequest @Public.Login
+    opt (header "Wire-API-Version")
+      .&. jsonRequest @Public.Login
       .&. def False (query "persist")
       .&. accept "application" "json"
   document "POST" "login" $ do
@@ -190,7 +193,8 @@ routesInternal = do
       .&. accept "application" "json"
 
   post "/i/sso-login" (continue ssoLoginH) $
-    jsonRequest @SsoLogin
+    opt (header "Wire-API-Version")
+      .&. jsonRequest @SsoLogin
       .&. def False (query "persist")
       .&. accept "application" "json"
 
@@ -231,18 +235,18 @@ reAuthUser :: UserId -> ReAuthUser -> (Handler r) ()
 reAuthUser uid body = do
   User.reauthenticate uid (reAuthPassword body) !>> reauthError
 
-loginH :: JsonRequest Public.Login ::: Bool ::: JSON -> (Handler r) Response
-loginH (req ::: persist ::: _) = do
-  lift . tokenResponse =<< flip login persist =<< parseJsonBody req
+loginH :: Maybe Version ::: JsonRequest Public.Login ::: Bool ::: JSON -> (Handler r) Response
+loginH (v ::: req ::: persist ::: _) = do
+  lift . tokenResponse v =<< flip login persist =<< parseJsonBody req
 
 login :: Public.Login -> Bool -> (Handler r) (Auth.Access ZAuth.User)
 login l persist = do
   let typ = if persist then PersistentCookie else SessionCookie
   Auth.login l typ !>> loginError
 
-ssoLoginH :: JsonRequest SsoLogin ::: Bool ::: JSON -> (Handler r) Response
-ssoLoginH (req ::: persist ::: _) = do
-  lift . tokenResponse =<< flip ssoLogin persist =<< parseJsonBody req
+ssoLoginH :: Maybe Version ::: JsonRequest SsoLogin ::: Bool ::: JSON -> (Handler r) Response
+ssoLoginH (v ::: req ::: persist ::: _) = do
+  lift . tokenResponse v =<< flip ssoLogin persist =<< parseJsonBody req
 
 ssoLogin :: SsoLogin -> Bool -> (Handler r) (Auth.Access ZAuth.User)
 ssoLogin l persist = do
@@ -251,7 +255,7 @@ ssoLogin l persist = do
 
 legalHoldLoginH :: JsonRequest LegalHoldLogin ::: JSON -> (Handler r) Response
 legalHoldLoginH (req ::: _) = do
-  lift . tokenResponse =<< legalHoldLogin =<< parseJsonBody req
+  lift . tokenResponse Nothing =<< legalHoldLogin =<< parseJsonBody req
 
 legalHoldLogin :: LegalHoldLogin -> (Handler r) (Auth.Access ZAuth.LegalHoldUser)
 legalHoldLogin l = do
@@ -320,8 +324,13 @@ rmCookies :: UserId -> Public.RemoveCookies -> (Handler r) ()
 rmCookies uid (Public.RemoveCookies pw lls ids) = do
   Auth.revokeAccess uid pw ids lls !>> authError
 
-renewH :: JSON ::: Maybe (Either (List1 ZAuth.UserToken) (List1 ZAuth.LegalHoldUserToken)) ::: Maybe (Either ZAuth.AccessToken ZAuth.LegalHoldAccessToken) -> (Handler r) Response
-renewH (_ ::: ut ::: at) = lift . either tokenResponse tokenResponse =<< renew ut at
+renewH ::
+  Maybe Version
+    ::: JSON
+    ::: Maybe (Either (List1 ZAuth.UserToken) (List1 ZAuth.LegalHoldUserToken))
+    ::: Maybe (Either ZAuth.AccessToken ZAuth.LegalHoldAccessToken) ->
+  (Handler r) Response
+renewH (v ::: _ ::: ut ::: at) = lift . either (tokenResponse v) (tokenResponse v) =<< renew ut at
 
 -- | renew access for either:
 -- * a user with user token and optional access token, or
@@ -406,9 +415,9 @@ tokenRequest = opt (userToken ||| legalHoldUserToken) .&. opt (accessToken ||| l
           )
       Just t -> return t
 
-tokenResponse :: ZAuth.UserTokenLike u => Auth.Access u -> (AppIO r) Response
-tokenResponse (Auth.Access t Nothing) = pure $ json t
-tokenResponse (Auth.Access t (Just c)) = Auth.setResponseCookie c (json t)
+tokenResponse :: ZAuth.UserTokenLike u => Maybe Version -> Auth.Access u -> (AppIO r) Response
+tokenResponse _ (Auth.Access t Nothing) = pure $ json t
+tokenResponse v (Auth.Access t (Just c)) = Auth.setResponseCookie v c (json t)
 
 -- | Internal utilities: These functions are nearly copies verbatim from the original
 -- project: https://gitlab.com/twittner/wai-predicates/-/blob/develop/src/Network/Wai/Predicate.hs#L106-112
diff --git a/services/brig/src/Brig/User/Auth/Cookie.hs b/services/brig/src/Brig/User/Auth/Cookie.hs
index 28023f5863..abff3fe519 100644
--- a/services/brig/src/Brig/User/Auth/Cookie.hs
+++ b/services/brig/src/Brig/User/Auth/Cookie.hs
@@ -59,6 +59,7 @@ import Network.Wai.Utilities.Response (addHeader)
 import System.Logger.Class (field, msg, val, (~~))
 import qualified System.Logger.Class as Log
 import qualified Web.Cookie as WebCookie
+import Wire.API.Routes.Version
 
 --------------------------------------------------------------------------------
 -- Basic Cookie Management
@@ -222,19 +223,22 @@ newCookieLimited u typ label = do
 
 setResponseCookie ::
   (Monad m, MonadReader Env m, ZAuth.UserTokenLike u) =>
+  Maybe Version ->
   Cookie (ZAuth.Token u) ->
   Response ->
   m Response
-setResponseCookie c r = do
+setResponseCookie mv c r = do
   s <- view settings
   let hdr = toByteString' (WebCookie.renderSetCookie (cookie s))
   return (addHeader "Set-Cookie" hdr r)
   where
+    versionPrefix :: ByteString
+    versionPrefix = foldMap (("/v" <>) . toByteString') mv
     cookie s =
       WebCookie.def
         { WebCookie.setCookieName = "zuid",
           WebCookie.setCookieValue = toByteString' (cookieValue c),
-          WebCookie.setCookiePath = Just "/access",
+          WebCookie.setCookiePath = Just (versionPrefix <> "/access"),
           WebCookie.setCookieExpires =
             if cookieType c == PersistentCookie
               then Just (cookieExpires c)