diff --git a/Cargo.lock b/Cargo.lock
index 68934530..89297a9c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -213,9 +213,9 @@ dependencies = [
 
 [[package]]
 name = "deno_core"
-version = "0.38.0"
+version = "0.39.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "40385b8a20c2092edcf63befe8c3e8f1b79bbe2c68616a156a7488c2644baecb"
+checksum = "106fdf021a2bde6d532c1fa9c51ab8f19d4cd4314f5f8d01db20479fc9a9be0a"
 dependencies = [
  "downcast-rs",
  "futures 0.3.4",
@@ -1041,9 +1041,9 @@ dependencies = [
 
 [[package]]
 name = "rusty_v8"
-version = "0.3.9"
+version = "0.3.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fee528081d3eb7efe829a0021063df092a241837f3c063fb825bf7aa8858f80c"
+checksum = "01403323dd70ffeace922e35555ca0c15223a20a4e1cf8f35cc4f68fadb3e285"
 dependencies = [
  "bitflags",
  "cargo_gn",
@@ -1076,18 +1076,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.105"
+version = "1.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e707fbbf255b8fc8c3b99abb91e7257a622caeb20a9818cbadbeeede4e0932ff"
+checksum = "36df6ac6412072f67cf767ebbde4133a5b2e88e76dc6187fa7104cd16f783399"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.105"
+version = "1.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac5d00fc561ba2724df6758a17de23df5914f20e41cb00f94d5b7ae42fffaff8"
+checksum = "9e549e3abf4fb8621bd1609f11dfc9f5e50320802273b12f3811a67e6716ea6c"
 dependencies = [
  "proc-macro2 1.0.8",
  "quote 1.0.2",
diff --git a/ts/tests/types-check.test.ts b/ts/tests/types-check.test.ts
index 96812503..fbb8ef7a 100644
--- a/ts/tests/types-check.test.ts
+++ b/ts/tests/types-check.test.ts
@@ -1,7 +1,9 @@
-import { assertThrows } from "https://deno.land/std@v0.35.0/testing/asserts.ts";
+import { assertEquals, assertThrows } from "../../test.deps.ts";
 import { ObjectId } from "../types.ts";
 
 Deno.test("ObjectId parse", function() {
-  assertThrows(() => ObjectId("d3e48b03-7baf-4d98-8df7-5002a8fae5e4"));
-  ObjectId("5e63a91b00d839ae0084dfe4");
+  let $oid = "d3e48b03-7baf-4d98-8df7-5002a8fae5e4";
+  assertThrows(() => ObjectId($oid));
+  $oid = "5e63a91b00d839ae0084dfe4";
+  assertEquals(ObjectId($oid), { $oid });
 });
diff --git a/ts/types.ts b/ts/types.ts
index 783f6b7d..9df2467a 100644
--- a/ts/types.ts
+++ b/ts/types.ts
@@ -1,5 +1,3 @@
-import { assert } from "https://deno.land/std@v0.35.0/testing/asserts.ts";
-
 export enum CommandType {
   ConnectWithUri = "ConnectWithUri",
   ConnectWithOptions = "ConnectWithOptions",
@@ -20,7 +18,9 @@ export interface ObjectId {
 }
 export function ObjectId($oid: string) {
   const isLegal = /[0-9a-fA-F]{24}/.test($oid);
-  assert(isLegal, `ObjectId("${$oid}") is not legal.`);
+  if (!isLegal) {
+    throw new Error(`ObjectId("${$oid}") is not legal.`);
+  }
   return { $oid };
 }