diff --git a/Build/build-anti-bogus-domain.ts b/Build/build-anti-bogus-domain.ts
index 127b9464..9ecfa61d 100644
--- a/Build/build-anti-bogus-domain.ts
+++ b/Build/build-anti-bogus-domain.ts
@@ -14,7 +14,7 @@ const getBogusNxDomainIPsPromise = fsFetchCache.apply(
   async () => {
     const result: string[] = [];
     for await (const line of await fetchRemoteTextByLine(URL)) {
-      if (line && line.startsWith('bogus-nxdomain=')) {
+      if (line.startsWith('bogus-nxdomain=')) {
         const ip = line.slice(15).trim();
         if (isProbablyIpv4(ip)) {
           result.push(`IP-CIDR,${ip}/32,no-resolve`);
diff --git a/Build/lib/aho-corasick.test.ts b/Build/lib/aho-corasick.test.ts
index a47d537c..a6713f4c 100644
--- a/Build/lib/aho-corasick.test.ts
+++ b/Build/lib/aho-corasick.test.ts
@@ -1,4 +1,4 @@
-// eslint-disable-next-line import/no-unresolved -- bun
+// eslint-disable-next-line import-x/no-unresolved -- bun
 import { describe, expect, it } from 'bun:test';
 import createKeywordFilter from './aho-corasick';
 
diff --git a/Build/lib/cache-filesystem.ts b/Build/lib/cache-filesystem.ts
index c0387c32..1135e791 100644
--- a/Build/lib/cache-filesystem.ts
+++ b/Build/lib/cache-filesystem.ts
@@ -1,4 +1,4 @@
-// eslint-disable-next-line import/no-unresolved -- bun built-in module
+// eslint-disable-next-line import-x/no-unresolved -- bun built-in module
 import { Database } from 'bun:sqlite';
 import os from 'os';
 import path from 'path';
diff --git a/Build/lib/fetch-assets.ts b/Build/lib/fetch-assets.ts
index f1ef4aa7..81debfb2 100644
--- a/Build/lib/fetch-assets.ts
+++ b/Build/lib/fetch-assets.ts
@@ -8,11 +8,11 @@ class CustomAbortError extends Error {
 
 const sleepWithAbort = (ms: number, signal: AbortSignal) => new Promise<void>((resolve, reject) => {
   if (signal.aborted) {
-    reject(signal.reason);
+    reject(signal.reason as Error);
     return;
   }
 
-  function stop(this: AbortSignal) { reject(this.reason); }
+  function stop(this: AbortSignal) { reject(this.reason as Error); }
 
   signal.addEventListener('abort', stop, { once: true });
   Bun.sleep(ms).then(resolve).catch(reject).finally(() => signal.removeEventListener('abort', stop));
diff --git a/Build/lib/fetch-retry.ts b/Build/lib/fetch-retry.ts
index ace61eec..09539272 100644
--- a/Build/lib/fetch-retry.ts
+++ b/Build/lib/fetch-retry.ts
@@ -7,12 +7,13 @@ const MAX_RETRIES = 5;
 const MAX_RETRY_AFTER = 20;
 const FACTOR = 6;
 
-function isClientError(err: any): err is NodeJS.ErrnoException {
-  if (!err) return false;
-  return (
-    err.code === 'ERR_UNESCAPED_CHARACTERS'
-    || err.message === 'Request path contains unescaped characters'
-  );
+function isClientError(err: unknown): err is NodeJS.ErrnoException {
+  if (!err || typeof err !== 'object') return false;
+
+  if ('code' in err) return err.code === 'ERR_UNESCAPED_CHARACTERS';
+  if ('message' in err) return err.message === 'Request path contains unescaped characters';
+
+  return false;
 }
 
 export class ResponseError extends Error {
@@ -70,7 +71,7 @@ function createFetchRetry($fetch: typeof fetch): FetchWithRetry {
       return await retry<Response>(async (bail) => {
         try {
           // this will be retried
-          const res = (await $fetch(url, opts)) as Response;
+          const res = (await $fetch(url, opts));
 
           if ((res.status >= 500 && res.status < 600) || res.status === 429) {
             // NOTE: doesn't support http-date format
diff --git a/Build/lib/trie.test.ts b/Build/lib/trie.test.ts
index ecbe6301..4fbefc4f 100644
--- a/Build/lib/trie.test.ts
+++ b/Build/lib/trie.test.ts
@@ -1,5 +1,5 @@
 import { createTrie } from './trie';
-// eslint-disable-next-line import/no-unresolved -- fuck eslint-import
+// eslint-disable-next-line import-x/no-unresolved -- fuck eslint-import
 import { describe, expect, it } from 'bun:test';
 
 describe('Trie', () => {
diff --git a/Build/validate-domestic.ts b/Build/validate-domestic.ts
index 49f67291..290f561c 100644
--- a/Build/validate-domestic.ts
+++ b/Build/validate-domestic.ts
@@ -1,5 +1,4 @@
 import { fetchRemoteTextByLine, readFileByLine } from './lib/fetch-text-by-line';
-import { Readable } from 'stream';
 import { parse } from 'csv-parse/sync';
 import { createTrie } from './lib/trie';
 import path from 'path';
diff --git a/bun.lockb b/bun.lockb
index 2ba123b4..2a82fa42 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index 6716239b..9a672cf8 100644
--- a/package.json
+++ b/package.json
@@ -32,15 +32,15 @@
     "tldts": "^6.1.16"
   },
   "devDependencies": {
-    "@eslint-sukka/node": "5.1.2",
-    "@eslint-sukka/ts": "5.1.2",
+    "@eslint-sukka/node": "6.0.0-beta.3",
+    "@eslint-sukka/ts": "6.0.0-beta.3",
     "@types/async-retry": "^1.4.8",
     "@types/bun": "^1.0.12",
     "@types/tar-stream": "^3.1.3",
     "bun-types": "^1.1.3",
-    "eslint": "^8.57.0",
-    "eslint-config-sukka": "5.1.2",
-    "eslint-formatter-sukka": "5.1.2",
+    "eslint": "^9.0.0",
+    "eslint-config-sukka": "6.0.0-beta.3",
+    "eslint-formatter-sukka": "6.0.0-beta.3",
     "mitata": "^0.1.11",
     "typescript": "^5.4.5"
   },