diff --git a/Gemfile.lock b/Gemfile.lock
index 0fc7045..55b1bc4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,18 +1,18 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (3.2.14)
+    activesupport (3.2.17)
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
-    chunky_png (1.2.8)
+    chunky_png (1.3.0)
     coffee-script (2.2.0)
       coffee-script-source
       execjs
-    coffee-script-source (1.6.3)
-    compass (0.12.2)
+    coffee-script-source (1.7.0)
+    compass (0.12.4)
       chunky_png (~> 1.2)
       fssm (>= 0.2.7)
-      sass (~> 3.1)
+      sass (~> 3.2.17)
     compass-holmes (0.1.1)
       compass (>= 0.11)
     em-websocket (0.5.0)
@@ -21,95 +21,93 @@ GEM
     eventmachine (1.0.3)
     execjs (1.4.0)
       multi_json (~> 1.0)
-    ffi (1.9.0)
+    ffi (1.9.3)
     fssm (0.2.10)
-    haml (4.0.3)
+    haml (4.0.5)
       tilt
     hike (1.2.3)
     http_parser.rb (0.5.3)
-    i18n (0.6.5)
-    kramdown (1.1.0)
-    listen (1.2.3)
+    i18n (0.6.9)
+    json (1.8.1)
+    kramdown (1.3.3)
+    listen (1.3.1)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
       rb-kqueue (>= 0.2)
-    middleman (3.1.5)
+    middleman (3.2.2)
       coffee-script (~> 2.2.0)
       compass (>= 0.12.2)
       execjs (~> 1.4.0)
       haml (>= 3.1.6)
-      kramdown (~> 1.1.0)
-      middleman-core (= 3.1.5)
-      middleman-more (= 3.1.5)
+      kramdown (~> 1.2)
+      middleman-core (= 3.2.2)
       middleman-sprockets (>= 3.1.2)
       sass (>= 3.1.20)
-      uglifier (~> 2.1.0)
-    middleman-core (3.1.5)
+      uglifier (~> 2.4.0)
+    middleman-core (3.2.2)
       activesupport (~> 3.2.6)
       bundler (~> 1.1)
-      i18n (~> 0.6.1)
-      listen (~> 1.2.2)
+      i18n (~> 0.6.9)
+      listen (~> 1.1)
       rack (>= 1.4.5)
       rack-test (~> 0.6.1)
       thor (>= 0.15.2, < 2.0)
-      tilt (~> 1.3.6)
-    middleman-deploy (0.1.3)
+      tilt (~> 1.4.1)
+    middleman-deploy (0.2.3)
       middleman-core (>= 3.0.0)
       net-sftp
       ptools
-    middleman-livereload (3.1.0)
-      em-websocket (>= 0.2.0)
-      middleman-core (>= 3.0.2)
-      multi_json (~> 1.0)
-      rack-livereload
-    middleman-more (3.1.5)
-    middleman-sprockets (3.1.4)
-      middleman-core (>= 3.0.14)
-      middleman-more (>= 3.0.14)
+    middleman-livereload (3.2.1)
+      em-websocket (~> 0.5.0)
+      middleman-core (~> 3.2)
+      multi_json (~> 1.8.4)
+      rack-livereload (~> 0.3.15)
+    middleman-sprockets (3.3.1)
+      middleman-core (>= 3.2)
       sprockets (~> 2.1)
       sprockets-helpers (~> 1.0.0)
       sprockets-sass (~> 1.0.0)
-    multi_json (1.8.0)
+    multi_json (1.8.4)
     net-sftp (2.1.2)
       net-ssh (>= 2.6.5)
-    net-ssh (2.7.0)
-    oily_png (1.1.0)
-      chunky_png (~> 1.2.7)
-    ptools (1.2.2)
+    net-ssh (2.8.0)
+    oily_png (1.1.1)
+      chunky_png (~> 1.3.0)
+    ptools (1.2.4)
     rack (1.5.2)
     rack-livereload (0.3.15)
       rack
     rack-test (0.6.2)
       rack (>= 1.0)
-    rake (10.1.0)
-    rb-fsevent (0.9.3)
-    rb-inotify (0.9.2)
+    rake (10.2.2)
+    rb-fsevent (0.9.4)
+    rb-inotify (0.9.3)
       ffi (>= 0.5.0)
-    rb-kqueue (0.2.0)
+    rb-kqueue (0.2.2)
       ffi (>= 0.5.0)
-    sass (3.2.11)
-    slim (2.0.1)
+    sass (3.2.18)
+    slim (2.0.2)
       temple (~> 0.6.6)
       tilt (>= 1.3.3, < 2.1)
-    sprockets (2.10.0)
+    sprockets (2.12.0)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
     sprockets-helpers (1.0.1)
       sprockets (~> 2.0)
-    sprockets-sass (1.0.2)
+    sprockets-sass (1.0.3)
       sprockets (~> 2.0)
       tilt (~> 1.1)
     susy (1.0.9)
       compass (>= 0.12.2)
       sass (>= 3.2.0)
     temple (0.6.7)
-    thor (0.18.1)
-    tilt (1.3.7)
-    uglifier (2.1.2)
+    thor (0.19.1)
+    tilt (1.4.1)
+    uglifier (2.4.0)
       execjs (>= 0.3.0)
-      multi_json (~> 1.0, >= 1.0.2)
+      json (>= 1.8.0)
 
 PLATFORMS
   ruby
diff --git a/source/jabber/index.html.slim b/source/jabber/index.html.slim
index 1ee8f08..9f62b7f 100644
--- a/source/jabber/index.html.slim
+++ b/source/jabber/index.html.slim
@@ -36,6 +36,11 @@ table.pure-table.pure-table-bordered summary="Connection information"
       ' (to send files)
     td proxy.higgsboson.tk:5000
 
+p
+  ' Don't have a jabber client?
+  ' Just visit our
+  a href="http://muc.higgsboson.tk/" browser-based chat
+
 p
   ' We use certificate from
   a href="http://www.cacert.org/" cacert
@@ -43,10 +48,12 @@ p
   a href="http://www.cacert.org/index.php?id=3" here
   '  to avoid certificate validation errors
 
-p
-  ' Don't have a jabber client?
-  ' Just visit our
-  a href="http://muc.higgsboson.tk/" browser-based chat
+p Install cacert on linux
+p $ sudo -i
+p $ mkdir -p /usr/local/share/ca-certificates/cacert.org
+p $ wget https://www.cacert.org/certs/root.crt -O /usr/local/share/ca-certificates/cacert.org/cacert.org_root.crt
+p $ wget http://www.cacert.org/certs/class3.crt -O /usr/local/share/ca-certificates/cacert.org/cacert.org_class3.crt
+p $ update-ca-certificates
 
 #chatpanel
   #collective-xmpp-chat-data"