diff --git a/.gitmodules b/.gitmodules
index f6253599..a4e752cf 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,16 +1,16 @@
 [submodule "ext/kolab"]
 	path = ext/kolab
 	url = https://git.kolab.org/diffusion/DS/docs-sphinx-ext.git
     branch = master
 [submodule "source/webmail-user-guide/roundcubemail-core"]
 	path = source/webmail-user-guide/roundcubemail-core
 	url = https://github.com/roundcube/roundcubemail
-    branch = master
+	branch = master
 [submodule "source/webmail-user-guide/roundcubemail-helpdocs"]
 	path = source/webmail-user-guide/roundcubemail-helpdocs
 	url = https://github.com/roundcube/roundcubemail-helpdocs
-    branch = master
+	branch = master
 [submodule "source/webmail-user-guide/roundcubemail-plugins-kolab"]
 	path = source/webmail-user-guide/roundcubemail-plugins-kolab
 	url = https://git.kolab.org/diffusion/RPK/roundcubemail-plugins-kolab.git
-    branch = master
+	branch = master
diff --git a/source/webmail-user-guide/roundcubemail-core b/source/webmail-user-guide/roundcubemail-core
new file mode 160000
index 00000000..354042c4
--- /dev/null
+++ b/source/webmail-user-guide/roundcubemail-core
@@ -0,0 +1 @@
+Subproject commit 354042c4f4000f463b8ba9fd7c1a918de9ec06b3
diff --git a/source/webmail-user-guide/roundcubemail-helpdocs b/source/webmail-user-guide/roundcubemail-helpdocs
new file mode 160000
index 00000000..49ccc209
--- /dev/null
+++ b/source/webmail-user-guide/roundcubemail-helpdocs
@@ -0,0 +1 @@
+Subproject commit 49ccc20966353d9f8f6982d471fbeed7e6ffa076
diff --git a/source/webmail-user-guide/roundcubemail-plugins-kolab b/source/webmail-user-guide/roundcubemail-plugins-kolab
new file mode 160000
index 00000000..d9e82e0a
--- /dev/null
+++ b/source/webmail-user-guide/roundcubemail-plugins-kolab
@@ -0,0 +1 @@
+Subproject commit d9e82e0acdd20e6d9c93a7fc24eec59c22331dc1