diff --git a/packages/playwright-core/browsers.json b/packages/playwright-core/browsers.json
index fd98db3439..1fa46b7ade 100644
--- a/packages/playwright-core/browsers.json
+++ b/packages/playwright-core/browsers.json
@@ -15,9 +15,9 @@
     },
     {
       "name": "firefox",
-      "revision": "1458",
+      "revision": "1459",
       "installByDefault": true,
-      "browserVersion": "128.0"
+      "browserVersion": "129.0"
     },
     {
       "name": "firefox-beta",
diff --git a/packages/playwright-core/src/server/deviceDescriptorsSource.json b/packages/playwright-core/src/server/deviceDescriptorsSource.json
index e564e3d895..457eaa45fa 100644
--- a/packages/playwright-core/src/server/deviceDescriptorsSource.json
+++ b/packages/playwright-core/src/server/deviceDescriptorsSource.json
@@ -1592,7 +1592,7 @@
     "defaultBrowserType": "chromium"
   },
   "Desktop Firefox HiDPI": {
-    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0",
+    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:129.0) Gecko/20100101 Firefox/129.0",
     "screen": {
       "width": 1792,
       "height": 1120
@@ -1652,7 +1652,7 @@
     "defaultBrowserType": "chromium"
   },
   "Desktop Firefox": {
-    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0",
+    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:129.0) Gecko/20100101 Firefox/129.0",
     "screen": {
       "width": 1920,
       "height": 1080