diff --git a/tests/extensions/base64ext.nim b/tests/extensions/base64ext.nim
index 0ffd24f..fc03d1c 100644
--- a/tests/extensions/base64ext.nim
+++ b/tests/extensions/base64ext.nim
@@ -95,7 +95,7 @@ proc base64Factory*(padding: bool): ExtFactory =
 
   proc factory(isServer: bool,
        args: seq[ExtParam]): Result[Ext, string] {.
-       gcsafe, raises: [Defect].} =
+       gcsafe, raises: [].} =
 
     # you can capture configuration variables via closure
     # if you want
diff --git a/tests/extensions/hexext.nim b/tests/extensions/hexext.nim
index 9da8f37..9be5bb3 100644
--- a/tests/extensions/hexext.nim
+++ b/tests/extensions/hexext.nim
@@ -83,7 +83,7 @@ proc hexFactory*(): ExtFactory =
 
   proc factory(isServer: bool,
        args: seq[ExtParam]): Result[Ext, string] {.
-       gcsafe, raises: [Defect].} =
+       gcsafe, raises: [].} =
 
     # you can capture configuration variables via closure
     # if you want
diff --git a/tests/helpers.nim b/tests/helpers.nim
index 78d1ece..77484bc 100644
--- a/tests/helpers.nim
+++ b/tests/helpers.nim
@@ -19,13 +19,15 @@ import pkg/[
 import ../websock/websock
 import ./keys
 
+{.push gcsafe, raises: [].}
+
 const WSPath* = when defined secure: "/wss" else: "/ws"
 
-proc rndStr*(size: int): string =
+proc rndStr*(size: int): string {.gcsafe, raises: [].} =
   for _ in 0..<size:
     add(result, char(rand(int('A') .. int('z'))))
 
-proc rndBin*(size: int): seq[byte] =
+proc rndBin*(size: int): seq[byte] {.gcsafe, raises: [].} =
    for _ in 0..<size:
       add(result, byte(rand(0 .. 255)))
 
@@ -45,7 +47,7 @@ proc createServer*(
   tlsFlags: set[TLSFlags] = {},
   tlsMinVersion = TLSVersion.TLS12,
   tlsMaxVersion = TLSVersion.TLS12): HttpServer
-  {.raises: [Defect, HttpError].} =
+  {.raises: [].} =
   try:
     let server = when defined secure:
       TlsHttpServer.create(
@@ -62,7 +64,7 @@ proc createServer*(
         flags = flags)
 
     when defined accepts:
-      proc accepts() {.async, raises: [Defect].} =
+      proc accepts() {.async, raises: [].} =
         try:
           let req = await server.accept()
           await req.handler()
diff --git a/tests/testframes.nim b/tests/testframes.nim
index 4cc2d1f..cece3ec 100644
--- a/tests/testframes.nim
+++ b/tests/testframes.nim
@@ -8,7 +8,6 @@
 ## those terms.
 
 import
-  pkg/stew/byteutils,
   pkg/chronos/unittest2/asynctests
 
 include ../websock/frame
@@ -17,7 +16,7 @@ include ../websock/frame
 
 suite "Test data frames":
   setup:
-    var maskKey: array[4, char]
+    var maskKey {.used.} : array[4, char]
 
   asyncTest "# 7bit length text":
     check (await Frame(
@@ -254,7 +253,7 @@ suite "Test data frames":
 
 suite "Test control frames":
   setup:
-    var maskKey: array[4, char]
+    var maskKey {.used.} : array[4, char]
 
   asyncTest "Close":
     check (await Frame(
diff --git a/tests/testhooks.nim b/tests/testhooks.nim
index a8a8ce4..940e260 100644
--- a/tests/testhooks.nim
+++ b/tests/testhooks.nim
@@ -25,30 +25,30 @@ type
     request: HttpRequest
 
 proc clientAppendGoodToken(ctx: Hook, headers: var HttpTable):
-     Result[void, string] {.gcsafe, raises: [Defect].} =
+     Result[void, string] {.gcsafe, raises: [].} =
   headers.add("auth-token", "good-token")
   return ok()
 
 proc clientAppendBadToken(ctx: Hook, headers: var HttpTable):
-     Result[void, string] {.gcsafe, raises: [Defect].} =
+     Result[void, string] {.gcsafe, raises: [].} =
   headers.add("auth-token", "bad-token")
   return ok()
 
 proc clientVerify(ctx: Hook, headers: HttpTable):
-     Future[Result[void, string]] {.async, gcsafe, raises: [Defect].} =
+     Future[Result[void, string]] {.gcsafe, async: (raises: []).} =
   var p = TokenHook(ctx)
   p.token = headers.getString("auth-status")
   return ok()
 
 proc serverVerify(ctx: Hook, headers: HttpTable):
-     Future[Result[void, string]] {.async, gcsafe, raises: [Defect].} =
+     Future[Result[void, string]] {.gcsafe, async: (raises: []).} =
   var p = TokenHook(ctx)
   if headers.getString("auth-token") == "good-token":
     p.status = 101
   return ok()
 
 proc serverAppend(ctx: Hook, headers: var HttpTable):
-     Result[void, string] {.gcsafe, raises: [Defect].} =
+     Result[void, string] {.gcsafe, raises: [].} =
   var p = TokenHook(ctx)
   if p.status == 101:
     headers.add("auth-status", "accept")
@@ -76,14 +76,17 @@ proc serverHook(): Hook =
   )
 
 proc serverVerifyWithCode(ctx: Hook, headers: HttpTable):
-     Future[Result[void, string]] {.async, gcsafe, raises: [Defect].} =
-  var p = TokenHook(ctx)
-  if headers.getString("auth-token") == "good-token":
-    p.status = 101
-    return ok()
-  else:
-    await p.request.stream.writer.sendError(Http401)
-    return err("authentication error")
+     Future[Result[void, string]] {.gcsafe, async: (raises: []).} =
+  try:
+    var p = TokenHook(ctx)
+    if headers.getString("auth-token") == "good-token":
+      p.status = 101
+      return ok()
+    else:
+      await p.request.stream.writer.sendError(Http401)
+      return err("authentication error")
+  except CatchableError as exc:
+    return err(exc.msg)
 
 proc serverHookWithCode(request: HttpRequest): Hook =
   TokenHook(
@@ -96,8 +99,8 @@ suite "Test Hooks":
   setup:
     var
       server: HttpServer
-      goodCP = goodClientHook()
-      badCP  = badClientHook()
+      goodCP {.used.} = goodClientHook()
+      badCP {.used.} = badClientHook()
 
   teardown:
     if server != nil:
@@ -109,7 +112,7 @@ suite "Test Hooks":
       check request.uri.path == WSPath
       let
         server = WSServer.new()
-        ws = await server.handleRequest(
+      discard await server.handleRequest(
           request,
           hooks = @[serverHook()]
         )
@@ -133,7 +136,7 @@ suite "Test Hooks":
       check request.uri.path == WSPath
       let
         server = WSServer.new()
-        ws = await server.handleRequest(
+      discard await server.handleRequest(
           request,
           hooks = @[serverHook()]
         )
@@ -157,7 +160,7 @@ suite "Test Hooks":
       check request.uri.path == WSPath
       let
         server = WSServer.new()
-        ws = await server.handleRequest(
+      discard await server.handleRequest(
           request,
           hooks = @[serverHookWithCode(request)]
         )
@@ -181,7 +184,7 @@ suite "Test Hooks":
       check request.uri.path == WSPath
       let
         server = WSServer.new()
-        ws = await server.handleRequest(
+      discard await server.handleRequest(
           request,
           hooks = @[serverHookWithCode(request)]
         )
diff --git a/tests/testutf8.nim b/tests/testutf8.nim
index 01aab18..b4d81c8 100644
--- a/tests/testutf8.nim
+++ b/tests/testutf8.nim
@@ -124,7 +124,7 @@ suite "UTF-8 validator in action":
       check request.uri.path == "/ws"
 
       proc onClose(status: StatusCodes, reason: string):
-        CloseResult {.gcsafe, raises: [Defect].} =
+        CloseResult {.gcsafe, raises: [].} =
         try:
           check status == StatusFulfilled
           check reason == closeReason
@@ -182,6 +182,7 @@ suite "UTF-8 validator in action":
 
     expect WSInvalidUTF8:
       let data = await session.recvMsg()
+      discard data
 
   asyncTest "invalid UTF-8 sequence close code":
     let closeReason = "i want to close\xc0\xaf"
@@ -207,3 +208,4 @@ suite "UTF-8 validator in action":
 
     expect WSInvalidUTF8:
       let data = await session.recvMsg()
+      discard data
diff --git a/tests/testwebsockets.nim b/tests/testwebsockets.nim
index 33f70c3..fa37269 100644
--- a/tests/testwebsockets.nim
+++ b/tests/testwebsockets.nim
@@ -70,6 +70,7 @@ suite "Test handshake":
       let session = await connectClient(
         address = initTAddress("127.0.0.1:8888"),
         version = 14)
+      discard session
 
   asyncTest "Test for client headers":
     proc handle(request: HttpRequest) {.async.} =
@@ -457,8 +458,8 @@ suite "Test framing":
     var futs: seq[Future[void]]
     for i in 0 ..< numMessages:
       futs.add session.send(testData, Opcode.Binary)
-    futs[0].cancel()  # expected to complete as it already started sending
-    futs[^2].cancel()  # expected to be canceled as it has not started yet
+    futs[0].cancelSoon()  # expected to complete as it already started sending
+    futs[^2].cancelSoon()  # expected to be canceled as it has not started yet
     await allFutures(futs)
     await session.close()
 
@@ -531,7 +532,7 @@ suite "Test Closing":
       check request.uri.path == WSPath
 
       proc closeServer(status: StatusCodes, reason: string): CloseResult{.gcsafe,
-          raises: [Defect].} =
+          raises: [].} =
         try:
           check status == StatusTooLarge
           check reason == "Message too big!"
@@ -554,7 +555,7 @@ suite "Test Closing":
       flags = {ReuseAddr})
 
     proc clientClose(status: StatusCodes, reason: string): CloseResult {.gcsafe,
-      raises: [Defect].} =
+      raises: [].} =
       try:
         check status == StatusFulfilled
         return (StatusTooLarge, "Message too big!")
@@ -587,7 +588,7 @@ suite "Test Closing":
     proc handle(request: HttpRequest) {.async.} =
       check request.uri.path == WSPath
       proc closeServer(status: StatusCodes, reason: string): CloseResult{.gcsafe,
-          raises: [Defect].} =
+          raises: [].} =
         try:
           check status == StatusFulfilled
           return (StatusTooLarge, "Message too big!")
@@ -608,7 +609,7 @@ suite "Test Closing":
       flags = {ReuseAddr})
 
     proc clientClose(status: StatusCodes, reason: string): CloseResult {.gcsafe,
-      raises: [Defect].} =
+      raises: [].} =
       try:
         check status == StatusTooLarge
         check reason == "Message too big!"
@@ -654,7 +655,7 @@ suite "Test Closing":
       flags = {ReuseAddr})
 
     proc closeClient(status: StatusCodes, reason: string): CloseResult
-      {.gcsafe, raises: [Defect].} =
+      {.gcsafe, raises: [].} =
       try:
         check status == StatusCodes(StatusLibsCodes.high)
         return (StatusCodes(StatusLibsCodes.high), "Reserved StatusCodes")
@@ -671,7 +672,7 @@ suite "Test Closing":
     proc handle(request: HttpRequest) {.async.} =
       check request.uri.path == WSPath
       proc closeServer(status: StatusCodes, reason: string): CloseResult{.gcsafe,
-          raises: [Defect].} =
+          raises: [].} =
         try:
           check status == StatusCodes(3999)
           return (StatusCodes(3999), "Reserved StatusCodes")
@@ -733,7 +734,7 @@ suite "Test Closing":
 
 suite "Test Payload":
   setup:
-    let rng = HmacDrbgContext.new()
+    let rng {.used.} = HmacDrbgContext.new()
     var
       server: HttpServer
 
@@ -812,7 +813,6 @@ suite "Test Payload":
     await session.close()
 
   asyncTest "Send two fragments":
-    var ping, pong = false
     let testString = "1234567890"
     let msg = toBytes(testString)
     let maxFrameSize = 5
@@ -1026,7 +1026,9 @@ suite "Test Binary message with Payload":
   asyncTest "Send binary data with small text payload":
     let testData = rndBin(10)
     trace "testData", testData = testData
-    var ping, pong = false
+    var
+      ping = false
+      pong = false
     proc handle(request: HttpRequest) {.async.} =
       check request.uri.path == WSPath
 
diff --git a/websock.nimble b/websock.nimble
index 6d87bfe..20fa927 100644
--- a/websock.nimble
+++ b/websock.nimble
@@ -15,7 +15,7 @@ license     = "MIT"
 skipDirs    = @["examples", "tests"]
 
 requires "nim >= 1.6.0"
-requires "chronos >= 3.0.0"
+requires "chronos#head"
 requires "httputils >= 0.2.0"
 requires "chronicles >= 0.10.2"
 requires "stew >= 0.1.0"
diff --git a/websock/extensions/compression/deflate.nim b/websock/extensions/compression/deflate.nim
index 73467c8..4f9f688 100644
--- a/websock/extensions/compression/deflate.nim
+++ b/websock/extensions/compression/deflate.nim
@@ -140,6 +140,7 @@ proc createParams(args: seq[ExtParam],
 
   ok(resp)
 
+{.warning[HoleEnumConv]:off.}
 proc getWindowBits(opts: DeflateOpts, isServer: bool): ZWindowBits =
   if isServer:
     if opts.serverMaxWindowBits == 0:
@@ -152,6 +153,8 @@ proc getWindowBits(opts: DeflateOpts, isServer: bool): ZWindowBits =
     else:
       ZWindowBits(-opts.clientMaxWindowBits)
 
+{.warning[HoleEnumConv]:on.}
+
 proc getContextTakeover(opts: DeflateOpts, isServer: bool): bool =
   if isServer:
     opts.serverNoContextTakeOver
@@ -369,7 +372,7 @@ proc deflateFactory*(
 
   proc factory(isServer: bool,
        args: seq[ExtParam]): Result[Ext, string] {.
-       gcsafe, raises: [Defect].} =
+       gcsafe, raises: [].} =
 
     # capture user configuration via closure
     var opts = DeflateOpts(
diff --git a/websock/frame.nim b/websock/frame.nim
index e4d0342..3595342 100644
--- a/websock/frame.nim
+++ b/websock/frame.nim
@@ -7,7 +7,7 @@
 ## This file may not be copied, modified, or distributed except according to
 ## those terms.
 
-{.push raises: [Defect].}
+{.push gcsafe, raises: [].}
 
 import pkg/[
   chronos,
diff --git a/websock/http/client.nim b/websock/http/client.nim
index 88cb565..e4fc61a 100644
--- a/websock/http/client.nim
+++ b/websock/http/client.nim
@@ -7,7 +7,7 @@
 ## This file may not be copied, modified, or distributed except according to
 ## those terms.
 
-{.push raises: [Defect].}
+{.push gcsafe, raises: [].}
 
 import std/[uri, strutils]
 import pkg/[
@@ -170,13 +170,17 @@ proc connect*(
   tlsMinVersion = TLSVersion.TLS12,
   tlsMaxVersion = TLSVersion.TLS12,
   hostName = ""): Future[T]
-  {.async, raises: [Defect, HttpError].} =
+  {.async: (raises: [CatchableError, HttpError]).} =
 
   let wantedHostName = if hostName.len > 0:
       hostName
     else:
       host.split(":")[0]
 
+  template used(x: typed) =
+    # silence unused warning
+    discard
+    
   let addrs = resolveTAddress(host)
   for a in addrs:
     try:
@@ -190,6 +194,7 @@ proc connect*(
 
       return conn
     except TransportError as exc:
+      used(exc)
       trace "Error connecting to address", address = $a, exc = exc.msg
 
   raise newException(HttpError,
diff --git a/websock/http/common.nim b/websock/http/common.nim
index fbfcc99..ba21332 100644
--- a/websock/http/common.nim
+++ b/websock/http/common.nim
@@ -7,7 +7,7 @@
 ## This file may not be copied, modified, or distributed except according to
 ## those terms.
 
-{.push raises: [Defect].}
+{.push gcsafe, raises: [].}
 
 import std/[uri]
 import pkg/[
diff --git a/websock/http/server.nim b/websock/http/server.nim
index e4f7a63..1eee8ed 100644
--- a/websock/http/server.nim
+++ b/websock/http/server.nim
@@ -7,7 +7,7 @@
 ## This file may not be copied, modified, or distributed except according to
 ## those terms.
 
-{.push raises: [Defect].}
+{.push gcsafe, raises: [].}
 
 import std/uri
 import pkg/[
@@ -43,6 +43,10 @@ type
 
   TlsHttpServer* = HttpServer
 
+template used(x: typed) =
+  # silence unused warning
+  discard
+    
 proc validateRequest(
   stream: AsyncStreamWriter,
   header: HttpRequestHeader): Future[ReqStatus] {.async.} =
@@ -69,7 +73,7 @@ proc parseRequest(
   ##
 
   var buffer = newSeq[byte](MaxHttpHeadersSize)
-  let remoteAddr = stream.reader.tsource.remoteAddress()
+  let remoteAddr {.used.} = stream.reader.tsource.remoteAddress()
   trace "Received connection", address = $remoteAddr
   try:
     let hlenfut = stream.reader.readUntil(
@@ -115,11 +119,12 @@ proc parseRequest(
     # remote peer disconnected
     trace "Remote peer disconnected", address = $remoteAddr
   except TransportOsError as exc:
+    used(exc)
     trace "Problems with networking", address = $remoteAddr, error = exc.msg
 
 proc handleConnCb(
   server: StreamServer,
-  transp: StreamTransport) {.async.} =
+  transp: StreamTransport) {.async: (raises: []).} =
   var stream: AsyncStream
   try:
     stream = AsyncStream(
@@ -131,10 +136,15 @@ proc handleConnCb(
 
     await httpServer.handler(request)
   except CatchableError as exc:
+    used(exc)  
     debug "Exception in HttpHandler", exc = exc.msg
   finally:
-    await stream.closeWait()
-
+    try:
+      await stream.closeWait()
+    except CatchableError as exc:
+      used(exc)
+      debug "Exception in HttpHandler closewait", exc = exc.msg
+      
 proc handleTlsConnCb(
   server: StreamServer,
   transp: StreamTransport) {.async.} =
@@ -158,6 +168,7 @@ proc handleTlsConnCb(
 
     await httpServer.handler(request)
   except CatchableError as exc:
+    used(exc)
     debug "Exception in HttpHandler", exc = exc.msg
   finally:
     await stream.closeWait()
@@ -208,7 +219,7 @@ proc create*(
   headersTimeout = HttpHeadersTimeout,
   handshakeTimeout = 0.seconds
   ): HttpServer
-  {.raises: [Defect, CatchableError].} = # TODO: remove CatchableError
+  {.raises: [CatchableError].} = # TODO: remove CatchableError
   ## Make a new HTTP Server
   ##
 
diff --git a/websock/session.nim b/websock/session.nim
index 30d82f9..e933812 100644
--- a/websock/session.nim
+++ b/websock/session.nim
@@ -7,7 +7,7 @@
 ## This file may not be copied, modified, or distributed except according to
 ## those terms.
 
-{.push raises: [Defect].}
+{.push gcsafe, raises: [].}
 
 import std/strformat
 import pkg/[chronos, chronicles, stew/byteutils, stew/endians2]
@@ -18,6 +18,10 @@ import pkg/chronos/streams/asyncstream
 logScope:
   topics = "websock ws-session"
 
+template used(x: typed) =
+  # silence unused warning
+  discard
+
 proc prepareCloseBody(code: StatusCodes, reason: string): seq[byte] =
   result = reason.toBytes
   if ord(code) > 999:
@@ -178,8 +182,7 @@ proc send*(
 
 proc send*(
   ws: WSSession,
-  data: string): Future[void]
-  {.raises: [Defect, WSClosedError].} =
+  data: string): Future[void] =
   send(ws, data.toBytes(), Opcode.Text)
 
 proc handleClose*(
@@ -214,7 +217,7 @@ proc handleClose*(
   else:
     try:
       code = StatusCodes(uint16.fromBytesBE(payload[0..<2]))
-    except RangeError:
+    except RangeDefect:
       raise newException(WSInvalidCloseCodeError,
         "Status code out of range!")
 
@@ -241,6 +244,7 @@ proc handleClose*(
     try:
       (code, reason) = ws.onClose(code, reason)
     except CatchableError as exc:
+      used(exc)
       trace "Exception in Close callback, this is most likely a bug", exc = exc.msg
   else:
     code = StatusFulfilled
@@ -253,6 +257,7 @@ proc handleClose*(
     try:
       await ws.send(prepareCloseBody(code, reason), Opcode.Close).wait(5.seconds)
     except CatchableError as exc:
+      used(exc)
       trace "Failed to send Close opcode", err=exc.msg
 
     ws.readyState = ReadyState.Closed
@@ -303,6 +308,7 @@ proc handleControl*(ws: WSSession, frame: Frame) {.async.} =
       try:
         ws.onPing(payload)
       except CatchableError as exc:
+        used(exc)
         trace "Exception in Ping callback, this is most likely a bug", exc = exc.msg
 
     # send pong to remote
@@ -312,12 +318,15 @@ proc handleControl*(ws: WSSession, frame: Frame) {.async.} =
       try:
         ws.onPong(payload)
       except CatchableError as exc:
+        used(exc)
         trace "Exception in Pong callback, this is most likely a bug", exc = exc.msg
   of Opcode.Close:
     await ws.handleClose(frame, payload)
   else:
     raise newException(WSInvalidOpcodeError, "Invalid control opcode!")
 
+{.warning[HoleEnumConv]:off.}
+
 proc readFrame*(ws: WSSession, extensions: seq[Ext] = @[]): Future[Frame] {.async.} =
   ## Gets a frame from the WebSocket.
   ## See https://tools.ietf.org/html/rfc6455#section-5.2
@@ -342,10 +351,11 @@ proc readFrame*(ws: WSSession, extensions: seq[Ext] = @[]): Future[Frame] {.asyn
 
     return frame
 
+{.warning[HoleEnumConv]:on.}
+
 proc ping*(
   ws: WSSession,
-  data: seq[byte] = @[]): Future[void]
-  {.raises: [Defect, WSClosedError].} =
+  data: seq[byte] = @[]): Future[void] =
   ws.send(data, opcode = Opcode.Ping)
 
 proc recv*(
@@ -462,7 +472,7 @@ proc recvMsg*(
     var res: seq[byte]
     while ws.readyState != ReadyState.Closed:
       var buf = new(seq[byte])
-      let read = await ws.recv(buf, min(size, ws.frameSize))
+      let read {.used.} = await ws.recv(buf, min(size, ws.frameSize))
 
       if res.len + buf[].len > size:
         raise newException(WSMaxMessageSizeError, "Max message size exceeded")
@@ -522,7 +532,7 @@ proc close*(
     except CancelledError as exc:
       raise exc
     except CatchableError as exc:
-      discard # most likely EOF
+      discard exc # most likely EOF
   try:
     ws.readyState = ReadyState.Closing
     await gentleCloser(ws, prepareCloseBody(code, reason)).wait(10.seconds)
@@ -530,6 +540,7 @@ proc close*(
     trace "Cancellation when closing!", exc = exc.msg
     raise exc
   except CatchableError as exc:
+    used(exc)
     trace "Exception closing", exc = exc.msg
   finally:
     await ws.stream.closeWait()
diff --git a/websock/types.nim b/websock/types.nim
index 41a752d..56187ac 100644
--- a/websock/types.nim
+++ b/websock/types.nim
@@ -7,7 +7,7 @@
 ## This file may not be copied, modified, or distributed except according to
 ## those terms.
 
-{.push raises: [Defect].}
+{.push gcsafe, raises: [].}
 
 import std/deques
 import pkg/[chronos,
@@ -73,14 +73,14 @@ type
   StatusCodes* = distinct range[0..4999]
 
   ControlCb* = proc(data: openArray[byte] = [])
-    {.gcsafe, raises: [Defect].}
+    {.gcsafe, raises: [].}
 
   CloseResult* = tuple
     code: StatusCodes
     reason: string
 
   CloseCb* = proc(code: StatusCodes, reason: string):
-    CloseResult {.gcsafe, raises: [Defect].}
+    CloseResult {.gcsafe, raises: [].}
 
   WebSocket* = ref object of RootObj
     extensions*: seq[Ext]
@@ -122,7 +122,7 @@ type
   ExtFactoryProc* = proc(
     isServer: bool,
     args: seq[ExtParam]): Result[Ext, string]
-    {.gcsafe, raises: [Defect].}
+    {.gcsafe, raises: [].}
 
   ExtFactory* = object
     name*: string
@@ -144,10 +144,10 @@ type
   Hook* = ref object of RootObj
     append*: proc(ctx: Hook,
                   headers: var HttpTable): Result[void, string]
-                  {.gcsafe, raises: [Defect].}
+                  {.gcsafe, raises: [].}
     verify*: proc(ctx: Hook,
                   headers: HttpTable): Future[Result[void, string]]
-                  {.closure, gcsafe, raises: [Defect].}
+                  {.gcsafe, async: (raises: []).}
 
   WebSocketError* = object of CatchableError
   WSMalformedHeaderError* = object of WebSocketError
diff --git a/websock/websock.nim b/websock/websock.nim
index b90477c..8bd4436 100644
--- a/websock/websock.nim
+++ b/websock/websock.nim
@@ -7,7 +7,7 @@
 ## This file may not be copied, modified, or distributed except according to
 ## those terms.
 
-{.push raises: [Defect].}
+{.push gcsafe, raises: [].}
 
 import std/[tables,
             strutils,
@@ -38,9 +38,6 @@ type
     protocols: seq[string]
     factories: seq[ExtFactory]
 
-func toException(e: string): ref WebSocketError =
-  (ref WebSocketError)(msg: e)
-
 func toException(e: cstring): ref WebSocketError =
   (ref WebSocketError)(msg: $e)
 
@@ -57,7 +54,7 @@ proc getFactory(factories: openArray[ExtFactory], extName: string): ExtFactoryPr
 proc selectExt(isServer: bool,
   extensions: var seq[Ext],
   factories: openArray[ExtFactory],
-  exts: openArray[string]): string {.raises: [Defect, WSExtError].} =
+  exts: openArray[string]): string {.raises: [WSExtError].} =
 
   var extList: seq[AppExt]
   var response = ""
@@ -216,7 +213,7 @@ proc connect*(
   onPong: ControlCb = nil,
   onClose: CloseCb = nil,
   rng = HmacDrbgContext.new()): Future[WSSession]
-  {.raises: [Defect, WSWrongUriSchemeError].} =
+  {.raises: [WSWrongUriSchemeError].} =
   ## Create a new websockets client
   ## using a Uri
   ##
@@ -254,11 +251,12 @@ proc handleRequest*(
   version: uint = WSDefaultVersion,
   hooks: seq[Hook] = @[]): Future[WSSession]
   {.
-    async,
-    raises: [
-      Defect,
+    async:
+    (raises: [
+      CancelledError,
+      CatchableError,
       WSHandshakeError,
-      WSProtoMismatchError]
+      WSProtoMismatchError])
   .} =
   ## Creates a new socket from a request.
   ##