diff --git a/deno.json b/deno.json
index 619ab66f7..1b3a853c3 100644
--- a/deno.json
+++ b/deno.json
@@ -40,7 +40,8 @@
   "lint": {
     "rules": {
       "include": [
-        "camelcase"
+        "camelcase",
+        "no-sync-fn-in-async-fn"
       ]
     }
   }
diff --git a/fs/ensure_link_test.ts b/fs/ensure_link_test.ts
index 0f12e25c1..3603cab95 100644
--- a/fs/ensure_link_test.ts
+++ b/fs/ensure_link_test.ts
@@ -137,7 +137,7 @@ Deno.test("ensureLink() rejects if link does not exist", async function () {
     // "Access is denied. (os error 5)" // throw in CI
   );
 
-  Deno.removeSync(testDir, { recursive: true });
+  await Deno.remove(testDir, { recursive: true });
 });
 
 Deno.test("ensureLinkSync() throws if link does not exist", function () {
diff --git a/http/file_server_test.ts b/http/file_server_test.ts
index 8d3b79180..134f289d2 100644
--- a/http/file_server_test.ts
+++ b/http/file_server_test.ts
@@ -958,13 +958,15 @@ Deno.test(
     },
   },
   async () => {
-    const tempDir = Deno.makeTempDirSync({ dir: `${moduleDir}/testdata` });
+    const tempDir = await Deno.makeTempDir({
+      dir: `${moduleDir}/testdata`,
+    });
     const req = new Request(`http://localhost/${basename(tempDir)}/`);
     const res = await serveDir(req, serveDirOptions);
     await res.body?.cancel();
 
     assertEquals(res.status, 200);
 
-    Deno.removeSync(tempDir);
+    await Deno.remove(tempDir);
   },
 );
diff --git a/http/server.ts b/http/server.ts
index 8fd3f3559..98d951543 100644
--- a/http/server.ts
+++ b/http/server.ts
@@ -773,7 +773,9 @@ export async function serveTls(
     once: true,
   });
 
+  // deno-lint-ignore no-sync-fn-in-async-fn
   const key = options.key || Deno.readTextFileSync(options.keyFile!);
+  // deno-lint-ignore no-sync-fn-in-async-fn
   const cert = options.cert || Deno.readTextFileSync(options.certFile!);
 
   const listener = Deno.listenTls({