diff --git a/unison-cli/src/Unison/Share/SyncV2.hs b/unison-cli/src/Unison/Share/SyncV2.hs
index 8f9768a7e0..d4e64e9cce 100644
--- a/unison-cli/src/Unison/Share/SyncV2.hs
+++ b/unison-cli/src/Unison/Share/SyncV2.hs
@@ -62,7 +62,7 @@ import Unison.Sync.Types qualified as Share
 import Unison.Sync.Types qualified as Sync
 import Unison.SyncV2.API (Routes (downloadEntitiesStream))
 import Unison.SyncV2.API qualified as SyncV2
-import Unison.SyncV2.Types (CBORBytes)
+import Unison.SyncV2.Types (CBORBytes, CBORStream)
 import Unison.SyncV2.Types qualified as SyncV2
 import Unison.Util.Servant.CBOR qualified as CBOR
 import Unison.Util.Timing qualified as Timing
@@ -440,14 +440,14 @@ type SyncAPI = ("ucm" Servant.:> "v2" Servant.:> "sync" Servant.:> SyncV2.API)
 syncAPI :: Proxy SyncAPI
 syncAPI = Proxy @SyncAPI
 
-downloadEntitiesStreamClientM :: SyncV2.DownloadEntitiesRequest -> Servant.ClientM (Servant.SourceT IO (CBORBytes SyncV2.DownloadEntitiesChunk))
+downloadEntitiesStreamClientM :: SyncV2.DownloadEntitiesRequest -> Servant.ClientM (Servant.SourceT IO (CBORStream SyncV2.DownloadEntitiesChunk))
 SyncV2.Routes
   { downloadEntitiesStream = downloadEntitiesStreamClientM
   } = Servant.client syncAPI
 
 -- | Helper for running clientM that returns a stream of entities.
 -- You MUST consume the stream within the callback, it will be closed when the callback returns.
-withConduit :: forall r. Servant.ClientEnv -> (Stream () (SyncV2.DownloadEntitiesChunk) -> StreamM r) -> Servant.ClientM (Servant.SourceIO (CBORBytes SyncV2.DownloadEntitiesChunk)) -> StreamM r
+withConduit :: forall r. Servant.ClientEnv -> (Stream () (SyncV2.DownloadEntitiesChunk) -> StreamM r) -> Servant.ClientM (Servant.SourceIO (CBORStream SyncV2.DownloadEntitiesChunk)) -> StreamM r
 withConduit clientEnv callback clientM = do
   ExceptT $ withRunInIO \runInIO -> do
     Servant.withClientM clientM clientEnv $ \case
@@ -456,7 +456,7 @@ withConduit clientEnv callback clientM = do
         conduit <- liftIO $ Servant.fromSourceIO sourceT
         (runInIO . runExceptT $ callback (conduit C..| unpackCBORBytesStream))
 
-unpackCBORBytesStream :: Stream (CBORBytes SyncV2.DownloadEntitiesChunk) SyncV2.DownloadEntitiesChunk
+unpackCBORBytesStream :: Stream (CBORStream SyncV2.DownloadEntitiesChunk) SyncV2.DownloadEntitiesChunk
 unpackCBORBytesStream =
   C.map (BL.toStrict . coerce @_ @BL.ByteString) C..| decodeUnframedEntities
 
diff --git a/unison-share-api/src/Unison/SyncV2/API.hs b/unison-share-api/src/Unison/SyncV2/API.hs
index ae575c1885..4aec0e6b54 100644
--- a/unison-share-api/src/Unison/SyncV2/API.hs
+++ b/unison-share-api/src/Unison/SyncV2/API.hs
@@ -21,7 +21,7 @@ type API = NamedRoutes Routes
 type DownloadEntitiesStream =
   -- | The causal hash the client needs. The server should provide it and all of its dependencies
   ReqBody '[CBOR, JSON] DownloadEntitiesRequest
-    :> StreamPost NoFraming CBOR (SourceIO (CBORBytes DownloadEntitiesChunk))
+    :> StreamPost NoFraming OctetStream (SourceIO (CBORStream DownloadEntitiesChunk))
 
 data Routes mode = Routes
   { downloadEntitiesStream :: mode :- "entities" :> "download" :> DownloadEntitiesStream
diff --git a/unison-share-api/src/Unison/SyncV2/Types.hs b/unison-share-api/src/Unison/SyncV2/Types.hs
index 80272de8ab..c2935110d9 100644
--- a/unison-share-api/src/Unison/SyncV2/Types.hs
+++ b/unison-share-api/src/Unison/SyncV2/Types.hs
@@ -7,6 +7,7 @@ module Unison.SyncV2.Types
     SyncError (..),
     DownloadEntitiesError (..),
     CBORBytes (..),
+    CBORStream(..),
     EntityKind (..),
     serialiseCBORBytes,
     deserialiseOrFailCBORBytes,
diff --git a/unison-share-api/src/Unison/Util/Servant/CBOR.hs b/unison-share-api/src/Unison/Util/Servant/CBOR.hs
index 18fd94904c..580b1a7124 100644
--- a/unison-share-api/src/Unison/Util/Servant/CBOR.hs
+++ b/unison-share-api/src/Unison/Util/Servant/CBOR.hs
@@ -5,6 +5,7 @@ module Unison.Util.Servant.CBOR
   ( CBOR,
     UnknownCBORBytes,
     CBORBytes (..),
+    CBORStream (..),
     deserialiseOrFailCBORBytes,
     serialiseCBORBytes,
     decodeCBORBytes,
@@ -86,3 +87,14 @@ serialiseUnknownCBORBytes = CBORBytes . CBOR.serialise
 data Unknown
 
 type UnknownCBORBytes = CBORBytes Unknown
+
+-- | Wrapper for a stream of CBOR data. Each chunk may not be a complete CBOR value, but the concatenation of all the chunks is a valid CBOR stream.
+newtype CBORStream a = CBORStream BL.ByteString
+  deriving (Serialise) via (BL.ByteString)
+  deriving (Eq, Show, Ord)
+
+instance MimeRender OctetStream (CBORStream a) where
+  mimeRender Proxy (CBORStream bs) = bs
+
+instance MimeUnrender OctetStream (CBORStream a) where
+  mimeUnrender Proxy bs = Right (CBORStream bs)