diff --git a/.changeset/clean-dev-browsers.md b/.changeset/clean-dev-browsers.md
new file mode 100644
index 00000000000..22ad7280a9d
--- /dev/null
+++ b/.changeset/clean-dev-browsers.md
@@ -0,0 +1,5 @@
+---
+'@clerk/clerk-js': patch
+---
+
+Fix dev browser recovery by clearing stale partitioned and non-partitioned dev browser cookie variants before minting a new dev browser.
diff --git a/packages/clerk-js/src/core/auth/cookies/__tests__/devBrowser.test.ts b/packages/clerk-js/src/core/auth/cookies/__tests__/devBrowser.test.ts
new file mode 100644
index 00000000000..49176d9966b
--- /dev/null
+++ b/packages/clerk-js/src/core/auth/cookies/__tests__/devBrowser.test.ts
@@ -0,0 +1,147 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { createDevBrowserCookie } from '../devBrowser';
+
+const { cookieStore, removeCalls, setCalls } = vi.hoisted(() => ({
+  cookieStore: new Map<string, string>(),
+  removeCalls: [] as Array<{ name: string; attributes?: object }>,
+  setCalls: [] as Array<{ name: string; value: string; attributes?: object }>,
+}));
+
+vi.mock('@clerk/shared/cookie', () => ({
+  createCookieHandler: (name: string) => ({
+    get: () => cookieStore.get(name),
+    remove: (attributes?: object) => {
+      removeCalls.push({ name, attributes });
+      cookieStore.delete(name);
+    },
+    set: (value: string, attributes?: object) => {
+      setCalls.push({ name, value, attributes });
+      cookieStore.set(name, value);
+    },
+  }),
+}));
+
+describe('createDevBrowserCookie', () => {
+  const cookieSuffix = 'test-suffix';
+  const suffixedCookieName = '__clerk_db_jwt_test-suffix';
+  const unsuffixedCookieName = '__clerk_db_jwt';
+  const devBrowser = 'test-dev-browser';
+  const now = new Date('2024-01-01T00:00:00.000Z');
+  const expires = new Date('2025-01-01T00:00:00.000Z');
+  const defaultOptions = { usePartitionedCookies: () => false };
+
+  beforeEach(() => {
+    vi.useFakeTimers();
+    vi.setSystemTime(now);
+    cookieStore.clear();
+    removeCalls.length = 0;
+    setCalls.length = 0;
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+    vi.unstubAllGlobals();
+  });
+
+  it('removes current, non-partitioned, and partitioned cookie variants for both dev browser cookie names', () => {
+    const cookieHandler = createDevBrowserCookie(cookieSuffix, defaultOptions);
+
+    cookieHandler.remove();
+
+    expect(removeCalls).toEqual([
+      {
+        name: suffixedCookieName,
+        attributes: {
+          sameSite: 'Lax',
+          secure: false,
+          partitioned: false,
+        },
+      },
+      { name: suffixedCookieName, attributes: undefined },
+      {
+        name: suffixedCookieName,
+        attributes: {
+          sameSite: 'None',
+          secure: true,
+          partitioned: true,
+        },
+      },
+      {
+        name: unsuffixedCookieName,
+        attributes: {
+          sameSite: 'Lax',
+          secure: false,
+          partitioned: false,
+        },
+      },
+      { name: unsuffixedCookieName, attributes: undefined },
+      {
+        name: unsuffixedCookieName,
+        attributes: {
+          sameSite: 'None',
+          secure: true,
+          partitioned: true,
+        },
+      },
+    ]);
+  });
+
+  it('clears stale partitioned cookie variants before writing a new dev browser', () => {
+    const cookieHandler = createDevBrowserCookie(cookieSuffix, defaultOptions);
+
+    cookieHandler.set(devBrowser);
+
+    expect(removeCalls).toContainEqual({
+      name: suffixedCookieName,
+      attributes: {
+        sameSite: 'None',
+        secure: true,
+        partitioned: true,
+      },
+    });
+    expect(removeCalls).toContainEqual({
+      name: unsuffixedCookieName,
+      attributes: {
+        sameSite: 'None',
+        secure: true,
+        partitioned: true,
+      },
+    });
+    expect(setCalls).toEqual([
+      {
+        name: suffixedCookieName,
+        value: devBrowser,
+        attributes: {
+          expires,
+          sameSite: 'Lax',
+          secure: false,
+          partitioned: false,
+        },
+      },
+      {
+        name: unsuffixedCookieName,
+        value: devBrowser,
+        attributes: {
+          expires,
+          sameSite: 'Lax',
+          secure: false,
+          partitioned: false,
+        },
+      },
+    ]);
+  });
+
+  it('reads the suffixed cookie before falling back to the unsuffixed cookie', () => {
+    const cookieHandler = createDevBrowserCookie(cookieSuffix, defaultOptions);
+
+    cookieStore.set(unsuffixedCookieName, 'unsuffixed-value');
+    cookieStore.set(suffixedCookieName, 'suffixed-value');
+
+    expect(cookieHandler.get()).toBe('suffixed-value');
+
+    cookieStore.delete(suffixedCookieName);
+
+    expect(cookieHandler.get()).toBe('unsuffixed-value');
+  });
+});
diff --git a/packages/clerk-js/src/core/auth/cookies/devBrowser.ts b/packages/clerk-js/src/core/auth/cookies/devBrowser.ts
index 0c69fb2d369..d4244e6de41 100644
--- a/packages/clerk-js/src/core/auth/cookies/devBrowser.ts
+++ b/packages/clerk-js/src/core/auth/cookies/devBrowser.ts
@@ -25,6 +25,12 @@ const getCookieAttributes = (options: DevBrowserCookieOptions) => {
   return { sameSite, secure, partitioned } as const;
 };
 
+const partitionedCookieAttributes = {
+  sameSite: 'None',
+  secure: true,
+  partitioned: true,
+} as const;
+
 /**
  * Create a long-lived JS cookie to store the dev browser token
  * ONLY for development instances.
@@ -40,33 +46,29 @@ export const createDevBrowserCookie = (
 
   const get = () => suffixedDevBrowserCookie.get() || devBrowserCookie.get();
 
+  const removeAll = () => {
+    const attributes = getCookieAttributes(options);
+
+    for (const cookie of [suffixedDevBrowserCookie, devBrowserCookie]) {
+      cookie.remove(attributes);
+      cookie.remove();
+      cookie.remove(partitionedCookieAttributes);
+    }
+  };
+
   const set = (devBrowser: string) => {
     const expires = addYears(Date.now(), 1);
     const { sameSite, secure, partitioned } = getCookieAttributes(options);
 
-    // Remove old non-partitioned cookies — the browser treats partitioned and
-    // non-partitioned cookies with the same name as distinct cookies.
-    if (partitioned) {
-      suffixedDevBrowserCookie.remove();
-      devBrowserCookie.remove();
-    }
+    // Remove stale variants before writing. The environment may not be loaded
+    // yet, so the current partitioned-cookies setting cannot be trusted.
+    removeAll();
 
     suffixedDevBrowserCookie.set(devBrowser, { expires, sameSite, secure, partitioned });
     devBrowserCookie.set(devBrowser, { expires, sameSite, secure, partitioned });
   };
 
-  const remove = () => {
-    const attributes = getCookieAttributes(options);
-    suffixedDevBrowserCookie.remove(attributes);
-    devBrowserCookie.remove(attributes);
-
-    // Also remove non-partitioned variants — the browser treats partitioned and
-    // non-partitioned cookies with the same name as distinct cookies.
-    if (attributes.partitioned) {
-      suffixedDevBrowserCookie.remove();
-      devBrowserCookie.remove();
-    }
-  };
+  const remove = () => removeAll();
 
   return {
     get,