diff --git a/quic.nimble b/quic.nimble
index 3ea049b..f90bbac 100644
--- a/quic.nimble
+++ b/quic.nimble
@@ -7,5 +7,5 @@ license = "MIT"
 requires "nim >= 1.2.6"
 requires "stew >= 0.1.0 & < 0.2.0"
 requires "chronos >= 2.5.2 & < 3.0.0"
-requires "https://github.com/status-im/nim-ngtcp2.git >= 0.1.0 & < 0.2.0"
+requires "https://github.com/status-im/nim-ngtcp2.git >= 0.32.0 & < 0.33.0"
 requires "sysrandom >= 1.1.0 & < 2.0.0"
diff --git a/quic/ngtcp2/client.nim b/quic/ngtcp2/client.nim
index 3109ac6..d8f4fb4 100644
--- a/quic/ngtcp2/client.nim
+++ b/quic/ngtcp2/client.nim
@@ -13,7 +13,7 @@ import connection
 import path
 import streams
 
-let zeroKey = Key()
+var zeroKey = dummyKey()
 
 proc clientInitial(connection: ptr ngtcp2_conn, user_data: pointer): cint {.cdecl.} =
   connection.install0RttKey(zeroKey)
@@ -56,7 +56,7 @@ proc newClientConnection*(local, remote: TransportAddress): Connection =
     unsafeAddr destination,
     unsafeAddr source,
     path.toPathPtr,
-    cast[uint32](NGTCP2_PROTO_VER),
+    cast[uint32](NGTCP2_PROTO_VER_MAX),
     addr callbacks,
     unsafeAddr settings,
     nil,
diff --git a/quic/ngtcp2/keys.nim b/quic/ngtcp2/keys.nim
index 2ace27e..ddc7bfd 100644
--- a/quic/ngtcp2/keys.nim
+++ b/quic/ngtcp2/keys.nim
@@ -2,11 +2,15 @@ import ngtcp2
 
 type
   Key* = object
+    cryptoContext*: ngtcp2_crypto_ctx
     aeadContext*: ngtcp2_crypto_aead_ctx
     hpContext*: ngtcp2_crypto_cipher_ctx
     iv*: array[16, uint8]
     secret*: array[16, uint8]
 
+proc dummyKey*: Key =
+  result.cryptoContext.max_encryption = 1000
+
 proc install0RttKey*(connection: ptr ngtcp2_conn, key: Key) =
   var key = key
   doAssert 0 == connection.ngtcp2_conn_install_initial_key(
@@ -18,6 +22,7 @@ proc install0RttKey*(connection: ptr ngtcp2_conn, key: Key) =
     addr key.hpContext,
     key.iv.len.uint
   )
+  connection.ngtcp2_conn_set_initial_crypto_ctx(addr key.cryptoContext)
 
 proc installHandshakeKeys*(connection: ptr ngtcp2_conn, rx, tx: Key) =
   var rx = rx
@@ -36,6 +41,7 @@ proc installHandshakeKeys*(connection: ptr ngtcp2_conn, rx, tx: Key) =
     tx.iv.len.uint,
     addr tx.hpContext
   )
+  connection.ngtcp2_conn_set_crypto_ctx(addr rx.cryptoContext)
 
 proc install1RttKeys*(connection: ptr ngtcp2_conn, rx, tx: Key) =
   var rx = rx
@@ -58,3 +64,4 @@ proc install1RttKeys*(connection: ptr ngtcp2_conn, rx, tx: Key) =
     tx.iv.len.uint,
     addr tx.hpContext
   )
+  connection.ngtcp2_conn_set_crypto_ctx(addr rx.cryptoContext)
diff --git a/quic/ngtcp2/server.nim b/quic/ngtcp2/server.nim
index 2f50500..c2c7697 100644
--- a/quic/ngtcp2/server.nim
+++ b/quic/ngtcp2/server.nim
@@ -14,7 +14,7 @@ import path
 import errors
 import streams
 
-let zeroKey = Key()
+let zeroKey = dummyKey()
 
 proc receiveClientInitial(connection: ptr ngtcp2_conn, dcid: ptr ngtcp2_cid, userData: pointer): cint {.cdecl.} =
   connection.install0RttKey(zeroKey)
@@ -57,7 +57,7 @@ proc newServerConnection(local, remote: TransportAddress, source, destination: n
     unsafeAddr source,
     unsafeAddr id,
     path.toPathPtr,
-    cast[uint32](NGTCP2_PROTO_VER),
+    cast[uint32](NGTCP2_PROTO_VER_MAX),
     addr callbacks,
     addr settings,
     nil,
diff --git a/quic/ngtcp2/udp.nim b/quic/ngtcp2/udp.nim
index 6f44b92..57419e8 100644
--- a/quic/ngtcp2/udp.nim
+++ b/quic/ngtcp2/udp.nim
@@ -23,6 +23,7 @@ proc trySend(connection: Connection): Datagram =
     0,
     getMonoTime().ticks.uint
   )
+  checkResult length.cint
   let data = connection.buffer[0..<length]
   let ecn = ECN(packetInfo.ecn)
   Datagram(data: data, ecn: ecn)