diff --git a/lib/crypto.ts b/lib/crypto.ts
index 0dc6d9a..0476e1c 100644
--- a/lib/crypto.ts
+++ b/lib/crypto.ts
@@ -13,7 +13,7 @@ async function getKey(): Promise<CryptoKey> {
 
         _signKey = await crypto.subtle.importKey(
             "raw",
-            hex.decode(new TextEncoder().encode(config.signKey)),
+            hex.decodeHex(config.signKey),
             { name: "HMAC", hash: "SHA-256" },
             false,
             ["sign", "verify"],
@@ -26,12 +26,12 @@ export async function sign(input: string): Promise<string> {
     const key = await getKey();
     const inputData = encoder.encode(input);
     const sig = await crypto.subtle.sign("HMAC", key, inputData);
-    return new TextDecoder().decode(hex.encode(new Uint8Array(sig)));
+    return hex.encodeHex(sig);
 }
 
 export async function verify(input: string, signature: string): Promise<boolean> {
     const key = await getKey();
-    const signatureData = hex.decode(encoder.encode(signature));
     const inputData = encoder.encode(input);
-    return await crypto.subtle.verify("HMAC", key, signatureData, inputData);
+    const sig = hex.decodeHex(signature);
+    return await crypto.subtle.verify("HMAC", key, sig, inputData);
 }
diff --git a/lib/handler.ts b/lib/handler.ts
index e4efeae..d918c49 100644
--- a/lib/handler.ts
+++ b/lib/handler.ts
@@ -1,4 +1,4 @@
-import { http } from "../deps.ts";
+import { httpErrors } from "../deps.ts";
 import config from "./config.ts";
 import { hasKey, verify } from "./crypto.ts";
 import filterWebhook from "./filter.ts";
@@ -19,20 +19,20 @@ export default async function handle(
 
     // everything else should be a POST
     if (req.method !== "POST") {
-        throw http.createHttpError(405);
+        throw httpErrors.createError(405);
     }
 
     // split url into parts
     const [, id, token] = url.pathname.split("/");
     if (!id || !token) {
-        throw http.createHttpError(400);
+        throw httpErrors.createError(400);
     }
 
     // verify signature
     if (hasKey) {
         const signature = url.searchParams.get("sig");
-        if (!signature) throw http.createHttpError(400);
-        if (!(await verify(`${id}/${token}`, signature))) throw http.createHttpError(403);
+        if (!signature) throw httpErrors.createError(400);
+        if (!(await verify(`${id}/${token}`, signature))) throw httpErrors.createError(403);
     }
 
     // extract data
@@ -70,7 +70,7 @@ function getUrlConfig(params: URLSearchParams): UrlConfig {
                 config.commentBurstLimit = parseInt(value);
                 break;
             default:
-                throw http.createHttpError(418, `Unknown config option: ${key}`);
+                throw httpErrors.createError(418, `Unknown config option: ${key}`);
         }
     }
     return config;
diff --git a/lib/manager.ts b/lib/manager.ts
index c3c5f86..ee4df85 100644
--- a/lib/manager.ts
+++ b/lib/manager.ts
@@ -1,4 +1,4 @@
-import { Lock, log, redis, TTLCache } from "../deps.ts";
+import { log, Mutex, redis, TTLCache } from "../deps.ts";
 import config from "./config.ts";
 
 const KEY_EXPIRY = 3; // seconds
@@ -22,12 +22,12 @@ class LocalCommentManager implements CommentManager {
 
 class RedisCommentManager implements CommentManager {
     private connectOptions: redis.RedisConnectOptions;
-    private lock: Lock;
+    private lock: Mutex;
     private _redis: Promise<redis.Redis> | undefined;
 
     constructor(options: redis.RedisConnectOptions) {
         this.connectOptions = options;
-        this.lock = new Lock();
+        this.lock = new Mutex();
     }
 
     // manual lazy init, redis.createLazyClient currently doesn't support pipelines :/
diff --git a/main.ts b/main.ts
index 4e84a6b..74057c6 100644
--- a/main.ts
+++ b/main.ts
@@ -1,12 +1,12 @@
-import { http, log } from "./deps.ts";
+import { http, httpErrors, log } from "./deps.ts";
 import config from "./lib/config.ts";
 import handler from "./lib/handler.ts";
 import { requestLog } from "./lib/util.ts";
 
-async function setupLogs(): Promise<void> {
-    await log.setup({
+function setupLogs() {
+    log.setup({
         handlers: {
-            console: new log.handlers.ConsoleHandler("DEBUG", {
+            console: new log.ConsoleHandler("DEBUG", {
                 formatter: (rec) => `${rec.datetime.toISOString()} [${rec.levelName}] ${rec.msg}`,
             }),
         },
@@ -32,7 +32,7 @@ async function handleRequest(req: Request, connInfo: http.ConnInfo): Promise<Res
             [res, meta] = webhookResult;
         }
     } catch (err) {
-        if (http.isHttpError(err) && err.expose) {
+        if (err instanceof httpErrors.HttpError && err.expose) {
             reqLog.warning(`http error: ${err.message}`);
             res = new Response(err.message, { status: err.status });
         } else {
@@ -69,7 +69,7 @@ async function handleRequest(req: Request, connInfo: http.ConnInfo): Promise<Res
 }
 
 if (import.meta.main) {
-    await setupLogs();
+    setupLogs();
 
     if (!config.signKey) {
         log.warning("url signing disabled");