diff --git a/client-src/index.js b/client-src/index.js
index 106ab1f8e..16b78f0cd 100644
--- a/client-src/index.js
+++ b/client-src/index.js
@@ -1,10 +1,9 @@
 /* global __resourceQuery, __webpack_public_path__ */
 
-import stripAnsi from "strip-ansi";
-
 import configureOverlay from "./overlay.js";
 import applyUpdate from "./process-update.js";
 import { log, setLogLevel } from "./utils/log.js";
+import stripAnsi from "./utils/strip-ansi.js";
 
 /** @typedef {import("./utils/log.js").LogLevel} LogLevel */
 
diff --git a/client-src/utils/strip-ansi.js b/client-src/utils/strip-ansi.js
new file mode 100644
index 000000000..721aa41ba
--- /dev/null
+++ b/client-src/utils/strip-ansi.js
@@ -0,0 +1,23 @@
+// Matches ANSI escape sequences. Ported from ansi-regex
+// (https://github.com/chalk/ansi-regex), inlined so the browser client does
+// not need the strip-ansi dependency.
+
+// Valid string terminator sequences are BEL, ESC\, and 0x9c
+const ST = "(?:\\u0007|\\u001B\\u005C|\\u009C)";
+
+// OSC sequences only: ESC ] ... ST (non-greedy until the first ST)
+const OSC = `(?:\\u001B\\][\\s\\S]*?${ST})`;
+
+// CSI and related: ESC/C1, optional intermediates, optional params (supports ; and :) then final byte
+const CSI =
+  "[\\u001B\\u009B][[\\]()#;?]*(?:\\d{1,4}(?:[;:]\\d{0,4})*)?[\\dA-PR-TZcf-nq-uy=><~]";
+
+const ANSI_REGEX = new RegExp(`${OSC}|${CSI}`, "g");
+
+/**
+ * @param {string} string string possibly containing ANSI escape sequences
+ * @returns {string} the string without ANSI escape sequences
+ */
+export default function stripAnsi(string) {
+  return string.replace(ANSI_REGEX, "");
+}
diff --git a/cspell.config.json b/cspell.config.json
index 46f70162e..4c86561d5 100644
--- a/cspell.config.json
+++ b/cspell.config.json
@@ -16,6 +16,8 @@
     "eslintcache",
     "esmodules",
     "noopener",
-    "noreferrer"
+    "noreferrer",
+    "mred",
+    "mbold"
   ]
 }
diff --git a/package-lock.json b/package-lock.json
index 3a4ce53a4..f3bcd0f91 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,8 +15,7 @@
         "mime-types": "^3.0.2",
         "on-finished": "^2.4.1",
         "range-parser": "^1.2.1",
-        "schema-utils": "^4.3.3",
-        "strip-ansi": "^6.0.1"
+        "schema-utils": "^4.3.3"
       },
       "devDependencies": {
         "@babel/cli": "^7.16.7",
@@ -17772,6 +17771,7 @@
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
       "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "ansi-regex": "^5.0.1"
@@ -17808,6 +17808,7 @@
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
       "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=8"
diff --git a/package.json b/package.json
index ab9d21e10..300d1d50e 100644
--- a/package.json
+++ b/package.json
@@ -63,8 +63,7 @@
     "mime-types": "^3.0.2",
     "on-finished": "^2.4.1",
     "range-parser": "^1.2.1",
-    "schema-utils": "^4.3.3",
-    "strip-ansi": "^6.0.1"
+    "schema-utils": "^4.3.3"
   },
   "devDependencies": {
     "@babel/cli": "^7.16.7",
diff --git a/test/strip-ansi.test.js b/test/strip-ansi.test.js
new file mode 100644
index 000000000..64421fe5c
--- /dev/null
+++ b/test/strip-ansi.test.js
@@ -0,0 +1,40 @@
+import stripAnsi from "../client-src/utils/strip-ansi";
+
+const ESC = String.fromCharCode(27);
+const BEL = String.fromCharCode(7);
+
+describe("stripAnsi", () => {
+  it("strips color sequences", () => {
+    expect(stripAnsi(`${ESC}[31mred${ESC}[39m plain`)).toBe("red plain");
+  });
+
+  it("strips style and background sequences", () => {
+    expect(stripAnsi(`${ESC}[1m${ESC}[42mbold-bg${ESC}[0m`)).toBe("bold-bg");
+  });
+
+  it("strips 256-color sequences", () => {
+    expect(stripAnsi(`${ESC}[38;5;196mred${ESC}[0m`)).toBe("red");
+  });
+
+  it("strips cursor and erase sequences", () => {
+    expect(stripAnsi(`${ESC}[2K${ESC}[1A${ESC}[2K${ESC}[G`)).toBe("");
+  });
+
+  it("strips terminal hyperlinks", () => {
+    expect(
+      stripAnsi(`${ESC}]8;;https://example.com${BEL}link${ESC}]8;;${BEL}`),
+    ).toBe("link");
+  });
+
+  it("keeps plain strings untouched", () => {
+    expect(stripAnsi("no ansi at all")).toBe("no ansi at all");
+  });
+
+  it("strips ansi from a webpack-style error line", () => {
+    expect(
+      stripAnsi(
+        `webpack ${ESC}[1m${ESC}[31mERROR${ESC}[39m${ESC}[22m in ./src/index.js 3:10`,
+      ),
+    ).toBe("webpack ERROR in ./src/index.js 3:10");
+  });
+});