diff --git a/eth/async_utils.nim b/eth/async_utils.nim
index 964bb6b..5256684 100644
--- a/eth/async_utils.nim
+++ b/eth/async_utils.nim
@@ -1,5 +1,5 @@
 import
-  chronos/[asyncfutures2, asyncloop], chronicles
+  chronos, chronicles
 
 proc catchOrQuit(error: Exception) =
   if error of CatchableError:
diff --git a/eth/common/eth_types_json_serialization.nim b/eth/common/eth_types_json_serialization.nim
index f6b7d9e..8b767e7 100644
--- a/eth/common/eth_types_json_serialization.nim
+++ b/eth/common/eth_types_json_serialization.nim
@@ -1,9 +1,9 @@
 import
   times, net,
-  json_serialization, nimcrypto/hash, eth_types
+  json_serialization, nimcrypto/[hash, utils], eth_types
 
 proc writeValue*(w: var JsonWriter, a: MDigest) {.inline.} =
-  w.writeValue $a
+  w.writeValue a.data.toHex(true)
 
 proc readValue*(r: var JsonReader, a: var MDigest) {.inline.} =
   a = fromHex(type(a), r.readValue(string))