diff --git a/lightstep-haskell.cabal b/lightstep-haskell.cabal
--- a/lightstep-haskell.cabal
+++ b/lightstep-haskell.cabal
@@ -1,7 +1,7 @@
 cabal-version: 2.4
 
 name:           lightstep-haskell
-version:        0.3.0
+version:        0.4.0
 synopsis:       LightStep OpenTracing client library
 description:    LightStep OpenTracing client library. Uses GRPC transport via proto-lens.
 category:       Tools
@@ -72,18 +72,20 @@
     , bytestring
     , chronos
     , containers
-    , safe-exceptions
+    , http-types
     , http2-client >= 0.9.0.0
-    , http2-client-grpc >= 0.7.0.0
+    , http2-client-grpc >= 0.8.0.0
+    , http2-grpc-proto-lens >= 0.1.0.0
     , lens
     , mtl
     , proto-lens >= 0.5.1.0
+    , proto-lens-protobuf-types >= 0.5.0.0
     , proto-lens-runtime >= 0.5.0.0
+    , safe-exceptions
     , stm
     , text
     , transformers
     , unordered-containers
-    , http-types
     , wai
 
 executable lightstep-haskell-example
diff --git a/src/LightStep/LowLevel.hs b/src/LightStep/LowLevel.hs
--- a/src/LightStep/LowLevel.hs
+++ b/src/LightStep/LowLevel.hs
@@ -15,6 +15,7 @@
 import LightStep.Internal.Debug
 import Network.GRPC.Client
 import Network.GRPC.Client.Helpers
+import Network.GRPC.HTTP2.ProtoLens
 import Network.HTTP2.Client
 import Proto.Collector
 import Proto.Collector_Fields