diff --git a/site/scripts/process/output.ts b/site/scripts/process/output.ts
index f34dc3b..2394d3a 100644
--- a/site/scripts/process/output.ts
+++ b/site/scripts/process/output.ts
@@ -1,4 +1,4 @@
-import { run } from "https://deno.land/x/proc@0.21.6/mod.ts";
+import { run } from "https://deno.land/x/proc@0.21.7/mod.ts";
 
 await run("echo", "Hello, world.").forEach((it) => console.dir(it));
 
diff --git a/src/utility.ts b/src/utility.ts
index da9bdd1..d3b68be 100644
--- a/src/utility.ts
+++ b/src/utility.ts
@@ -159,7 +159,8 @@ export async function sleep(delayms: number): Promise<void> {
  * @returns `true` if the thing is a string.
  */
 export function isString(s: unknown): s is string {
-  return Object.prototype.toString.call(s) === "[object String]";
+  return typeof s === "string" || s instanceof String ||
+    Object.prototype.toString.call(s) === "[object String]";
 }
 
 /**
diff --git a/version.json b/version.json
index 1232eaa..fa621de 100644
--- a/version.json
+++ b/version.json
@@ -1 +1 @@
-{"version":"0.21.7"}
+{"version":"0.21.8"}