diff --git a/package.json b/package.json
index f91e867e..246ae1c3 100644
--- a/package.json
+++ b/package.json
@@ -110,7 +110,7 @@
     "tslib": "^2.3.1",
     "typedoc": "^0.21.9",
     "typedoc-plugin-markdown": "^3.10.4",
-    "typescript": "^4.4.2",
+    "typescript": "4.3.5",
     "uWebSockets.js": "uNetworking/uWebSockets.js#v19.3.0",
     "ws": "^8.2.1"
   }
diff --git a/src/utils.ts b/src/utils.ts
index ebacd348..01e3114b 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -26,7 +26,7 @@ export function isAsyncGenerator<T = unknown>(
 ): val is AsyncGenerator<T> {
   return (
     isObject(val) &&
-    typeof val[Symbol.asyncIterator] === 'function' &&
+    typeof Object(val)[Symbol.asyncIterator] === 'function' &&
     typeof val.return === 'function'
     // for lazy ones, we only need the return anyway
     // typeof val.throw === 'function' &&
diff --git a/tsconfig.json b/tsconfig.json
index cb7aad74..1249a1b7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,8 +10,7 @@
     "baseUrl": "./src",
     "esModuleInterop": true,
     "skipLibCheck": true,
-    "forceConsistentCasingInFileNames": true,
-    "useUnknownInCatchVariables": false
+    "forceConsistentCasingInFileNames": true
   },
   "exclude": ["lib"]
 }
diff --git a/yarn.lock b/yarn.lock
index 61a0e1b9..df7fa657 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2192,9 +2192,9 @@ __metadata:
   linkType: hard
 
 "@types/node@npm:*":
-  version: 16.7.13
-  resolution: "@types/node@npm:16.7.13"
-  checksum: 15dc28aa44674d3f49dcca4a6523b6ab1ef9bbea5c659057bec13153e1873718d6b62ab0ea57a3d57ee37f0f1136ae30e3ea503df43b0afa3ae437c8750be7f5
+  version: 16.9.0
+  resolution: "@types/node@npm:16.9.0"
+  checksum: cb210bcfe201d6506f1ace9e940cf45307c1fc845ad1e67bb4a2dc39a2e3441382973e96b78568844c6f324cd0d2dddcb07639313d75cdb1ac5776c9255349fb
   languageName: node
   linkType: hard
 
@@ -4699,7 +4699,7 @@ __metadata:
     tslib: ^2.3.1
     typedoc: ^0.21.9
     typedoc-plugin-markdown: ^3.10.4
-    typescript: ^4.4.2
+    typescript: 4.3.5
     uWebSockets.js: "uNetworking/uWebSockets.js#v19.3.0"
     ws: ^8.2.1
   peerDependencies:
@@ -6471,11 +6471,11 @@ __metadata:
   linkType: hard
 
 "marked@npm:^3.0.2":
-  version: 3.0.2
-  resolution: "marked@npm:3.0.2"
+  version: 3.0.3
+  resolution: "marked@npm:3.0.3"
   bin:
     marked: bin/marked
-  checksum: 6f88083a7e50494f97af9f92f1b03a299ecde78055f7378dd0837f12aa2e192db84b7ed528d3e7008fd8d26d39f23a2a07af2a349899917171531574798563b5
+  checksum: 82651af57ae9d16199ba86f4d48474b6680521cbc0a8d1c142924b3977098a2d750f4eab3ca297ba8a083e4ef072721066e8f03b9a0a9a75948ee0be9506fc2f
   languageName: node
   linkType: hard
 
@@ -9115,23 +9115,23 @@ __metadata:
   languageName: node
   linkType: hard
 
-typescript@^4.4.2:
-  version: 4.4.2
-  resolution: "typescript@npm:4.4.2"
+typescript@4.3.5:
+  version: 4.3.5
+  resolution: "typescript@npm:4.3.5"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 194e08e9d1971d667d6fd1a0554616b7022312a2319d70e81a64e502a265992061ee7817ed9a69b52bbabe7a9b85e7938cb8c11c433e40a516b277f8c4dacd51
+  checksum: bab033b5e2b0790dd35b77fd005df976ef80b8d84fd2c6e63cc31808151875beae9216e5a315fe7068e8499905c3c354248fe83272cdfc13b7705635f0c66c97
   languageName: node
   linkType: hard
 
-"typescript@patch:typescript@^4.4.2#~builtin<compat/typescript>":
-  version: 4.4.2
-  resolution: "typescript@patch:typescript@npm%3A4.4.2#~builtin<compat/typescript>::version=4.4.2&hash=d8b4e7"
+"typescript@patch:typescript@4.3.5#~builtin<compat/typescript>":
+  version: 4.3.5
+  resolution: "typescript@patch:typescript@npm%3A4.3.5#~builtin<compat/typescript>::version=4.3.5&hash=d8b4e7"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 11d6ab6e868117908c388401e2ac06d503c5c8709115ab80ee69a1a6352c1f98471d1e595636bfe6a2d6b20b03a44df6bb2d3d198cea97c0c328968cd18d2b70
+  checksum: bc2c4fdf0f1557fdafe4ef74848c72ebd9c8c60829568248f869121aea2bb20e16649a252431d0acb185ec118143be22bed73d08f64379557810d82756afedde
   languageName: node
   linkType: hard
 
@@ -9466,8 +9466,8 @@ typescript@^4.4.2:
   linkType: hard
 
 "ws@npm:^7.4.6":
-  version: 7.5.4
-  resolution: "ws@npm:7.5.4"
+  version: 7.5.5
+  resolution: "ws@npm:7.5.5"
   peerDependencies:
     bufferutil: ^4.0.1
     utf-8-validate: ^5.0.2
@@ -9476,13 +9476,13 @@ typescript@^4.4.2:
       optional: true
     utf-8-validate:
       optional: true
-  checksum: 48582e4feb1fc6b6b977a0ee6136e5cd1c6a14bc5cb6ce5acf596652b34be757cdf0c225235b3263d56d057bc5d6e528dbe27fc88a3d09828aa803c6696f4b2c
+  checksum: bd2b437256012af526c69c03d6670a132e7ab0fe5853f3b7092826acea4203fad4ee2a8d0d9bd44834b2b968e747bf34f753ab535f4a3edf40d262da4b1d0805
   languageName: node
   linkType: hard
 
 "ws@npm:^8.0.0, ws@npm:^8.2.1":
-  version: 8.2.1
-  resolution: "ws@npm:8.2.1"
+  version: 8.2.2
+  resolution: "ws@npm:8.2.2"
   peerDependencies:
     bufferutil: ^4.0.1
     utf-8-validate: ^5.0.2
@@ -9491,7 +9491,7 @@ typescript@^4.4.2:
       optional: true
     utf-8-validate:
       optional: true
-  checksum: 22906903c7952790a911627f99e3419d8f251a6a540d9ba4f334a7e0865d7ea7026d8ad23829c3c0f2843a9f15bdb91c646e7f8853a5a5ba25a57dea2cf7d416
+  checksum: 25e764c631141bdca45badc86e69437b8791e57e461f9a16c0f7cd779baf70c3fbba07ecdd9e0d34fea1155ddcf62ef165cd7f81b68ed545bc7d455c15a85fb0
   languageName: node
   linkType: hard