diff --git a/weboob/browser/profiles.py b/weboob/browser/profiles.py
index f60abc58..c900f435 100644
--- a/weboob/browser/profiles.py
+++ b/weboob/browser/profiles.py
@@ -72,7 +72,7 @@ class Firefox(Profile):
             'Accept-Language': 'en-us,en;q=0.5',
             'Accept-Encoding': 'gzip, deflate',
             'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
-            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0',
+            'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0',
             'DNT': '1'}
 
 
diff --git a/weboob/deprecated/browser/browser.py b/weboob/deprecated/browser/browser.py
index a213a2c2..1467ff93 100644
--- a/weboob/deprecated/browser/browser.py
+++ b/weboob/deprecated/browser/browser.py
@@ -152,7 +152,7 @@ class StandardBrowser(mechanize.Browser):
 
     ENCODING = 'utf-8'
     USER_AGENTS = {
-        'desktop_firefox': 'Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0',
+        'desktop_firefox': 'Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0',
         'android': 'Mozilla/5.0 (Linux; U; Android 2.1; en-us; Nexus One Build/ERD62) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17',
         'microb': 'Mozilla/5.0 (X11; U; Linux armv7l; fr-FR; rv:1.9.2.3pre) Gecko/20100723 Firefox/3.5 Maemo Browser 1.7.4.8 RX-51 N900',
         'wget': 'Wget/1.11.4',