diff --git a/builtins.test.ts b/builtins.test.ts
index ed32b49..d428644 100644
--- a/builtins.test.ts
+++ b/builtins.test.ts
@@ -1,6 +1,6 @@
-import { assertThrows } from "https://deno.land/std@0.186.0/testing/asserts.ts";
-import { describe, it } from "https://deno.land/std@0.186.0/testing/bdd.ts";
-import { expect } from "https://deno.land/x/expect@v0.3.0/mod.ts";
+import { assertThrows } from "https://deno.land/std@0.221.0/testing/asserts.ts";
+import { describe, it } from "https://deno.land/std@0.221.0/testing/bdd.ts";
+import { expect } from "https://deno.land/x/expect@v0.4.0/mod.ts";
 import {
   all,
   any,
diff --git a/custom.test.ts b/custom.test.ts
index 07bb373..c2f214a 100644
--- a/custom.test.ts
+++ b/custom.test.ts
@@ -1,5 +1,5 @@
-import { describe, it } from "https://deno.land/std@0.186.0/testing/bdd.ts";
-import { expect } from "https://deno.land/x/expect@v0.3.0/mod.ts";
+import { describe, it } from "https://deno.land/std@0.221.0/testing/bdd.ts";
+import { expect } from "https://deno.land/x/expect@v0.4.0/mod.ts";
 import { compact, compactObject, flatmap } from "./custom.ts";
 import { repeat } from "./itertools.ts";
 
diff --git a/itertools.test.ts b/itertools.test.ts
index 5b096a8..7b3f72e 100644
--- a/itertools.test.ts
+++ b/itertools.test.ts
@@ -1,5 +1,5 @@
-import { describe, it } from "https://deno.land/std@0.186.0/testing/bdd.ts";
-import { expect } from "https://deno.land/x/expect@v0.3.0/mod.ts";
+import { describe, it } from "https://deno.land/std@0.221.0/testing/bdd.ts";
+import { expect } from "https://deno.land/x/expect@v0.4.0/mod.ts";
 import { all, iter, range } from "./builtins.ts";
 import {
   chain,
diff --git a/more-itertools.test.ts b/more-itertools.test.ts
index cf7a1ce..c4881f9 100644
--- a/more-itertools.test.ts
+++ b/more-itertools.test.ts
@@ -1,5 +1,5 @@
-import { describe, it } from "https://deno.land/std@0.186.0/testing/bdd.ts";
-import { expect } from "https://deno.land/x/expect@v0.3.0/mod.ts";
+import { describe, it } from "https://deno.land/std@0.221.0/testing/bdd.ts";
+import { expect } from "https://deno.land/x/expect@v0.4.0/mod.ts";
 import { range } from "./builtins.ts";
 import { first } from "./custom.ts";
 import {