diff --git a/conf/app.src b/conf/app.src
new file mode 100644
index 0000000..25328ed
--- /dev/null
+++ b/conf/app.src
@@ -0,0 +1,4 @@
+SOURCE_URL=https://github.com/movim/movim/archive/v0.13.tar.gz
+SOURCE_SUM=7aa5b2b6cd97e87a440981cfb6788a6f04ffd5eb4545026c49e1c61771593d11
+SOURCE_SUM_PRG=sha256sum
+SOURCE_FORMAT=tar.gz
\ No newline at end of file
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 803c6a8..b4c690b 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -3,12 +3,6 @@
 # Common variables
 #
 
-# Git repository of Movim
-GIT_REPO="https://github.com/movim/movim"
-
-# Commit to checkout
-HEAD_COMMIT="ee249f1e37b548c71b9a339dd358fbd2136e3291"
-
 # App package root directory should be the parent folder
 PKGDIR=$(cd ../; pwd)
 
@@ -23,11 +17,11 @@ exec_cmd() {
    && sudo sudo -u movim "$@")
 }
 
-# Apply the SSO patch to Movim source code
-# usage: apply_sso_patch
-apply_sso_patch() {
-  local patch_path="/tmp/sso-logout.patch"
-  cp -f "${PKGDIR}/patches/sso-logout.patch" "$patch_path"
-  exec_cmd git apply "$patch_path"
-  ynh_secure_remove "$patch_path"
+# Undo the SSO patch to Movim source code (applied by default with ynh_setup_source)
+# usage: undo_sso_patch
+undo_sso_patch() {
+  	(
+  		cd $final_path
+		patch -p1 -R < $YNH_CWD/../sources/patches/app-00-sso-logout.patch
+	)
 }
diff --git a/scripts/install b/scripts/install
index 9a013f0..9e95ba5 100644
--- a/scripts/install
+++ b/scripts/install
@@ -106,12 +106,7 @@ ynh_install_app_dependencies php5-gd php5-curl php5-imagick php5-cli php5-zmq
 
 ynh_app_setting_set "$app" final_path "$final_path"
 
-# Download Movim source code
-tmp_path=/tmp/movim-git
-ynh_secure_remove "$tmp_path"
-(git clone "$GIT_REPO" "$tmp_path" \
-   && cd "$tmp_path" && git checkout "$HEAD_COMMIT") \
-  || ynh_die "Unable to download Movim source code."
+ynh_setup_source "$final_path"
 
 #=================================================
 # SET CONFIGURATION FILE
@@ -119,17 +114,14 @@ ynh_secure_remove "$tmp_path"
 
 # TODO: add checksum
 # Set database configuration
-cp "${tmp_path}/config/"{db.example.inc.php,db.inc.php}
+cp "$final_path/config/"{db.example.inc.php,db.inc.php}
 ynh_replace_string "'username'    => 'username'" "'username'    => '$db_user'" \
-    "${tmp_path}/config/db.inc.php"
+    "$final_path/config/db.inc.php"
 ynh_replace_string "'password'    => 'password'" "'password'    => '$db_pwd'" \
-    "${tmp_path}/config/db.inc.php"
+    "$final_path/config/db.inc.php"
 ## TODO: consider installation in a subpath
 ynh_replace_string "'/ws/'" "'${path_url%/}/ws/'" \
-    "${tmp_path}/app/assets/js/movim_websocket.js"
-
-# Move Movim source code
-mv "$tmp_path" "$final_path"
+    "$final_path/app/assets/js/movim_websocket.js"
 
 #=================================================
 # CREATE DEDICATED USER
@@ -147,6 +139,10 @@ find "${final_path}/" -type f -print0 | xargs -0 chmod 0644
 find "${final_path}/" -type d -print0 | xargs -0 chmod 0755
 chmod 400 "${final_path}/config/db.inc.php"
 
+#=================================================
+# Install PHP dependencies using composer
+#=================================================
+
 # Install PHP dependencies using composer
 (curl -sS https://getcomposer.org/installer \
      | exec_cmd php -- --install-dir="$final_path" \
@@ -212,9 +208,9 @@ cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/movim.conf
 if [[ "$ssoenabled" = "No" ]]; then
     ynh_app_setting_set "$app" skipped_uris "/"
     exec_cmd php mud.php config --xmppwhitelist="$domain"
+    undo_sso_patch
 else
     ynh_app_setting_set "$app" unprotected_uris "/"
-    apply_sso_patch
 fi
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index b81ae19..4f13db0 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -71,33 +71,12 @@ ynh_install_app_dependencies php5-zmq
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
 
-# Init git repository as needed
-if [ ! -d "${final_path}/.git" ]; then
-    tmp_path=/tmp/movim-git
-    ynh_secure_remove "$tmp_path"
+ynh_setup_source "$final_path"
 
-    # Download Movim source code
-    (git clone "$GIT_REPO" "$tmp_path" \
-       && cd "$tmp_path" && git checkout "$HEAD_COMMIT") \
-      || ynh_die "Unable to download Movim source code."
-    cp "${final_path}/config/db.inc.php" "${tmp_path}/config/db.inc.php"
+chown -R movim:www-data "$final_path"
 
-    # Replace current source code
-    ynh_secure_remove "$final_path"
-    mv "$tmp_path" "$final_path"
-    chown -R movim:www-data "$final_path"
-
-    # Install composer for PHP dependencies
-    curl -sS https://getcomposer.org/installer \
-        | exec_cmd php -- --install-dir="$final_path"
-fi
-
-# Update Movim source code
-(exec_cmd git fetch origin \
-   && exec_cmd git reset --hard "$HEAD_COMMIT") \
-  || ynh_die "Unable to download Movim source code."
 ## TODO: consider installation in a subpath
-exec_cmd ynh_replace_string "'/ws/'" "'${path_url%/}/ws/'" \
+ynh_replace_string "'/ws/'" "'${path_url%/}/ws/'" \
     "${final_path}/app/assets/js/movim_websocket.js"
 
 #=================================================
@@ -121,6 +100,9 @@ chmod 400 "${final_path}/config/db.inc.php"
 # install PHP dependencies
 #=================================================
 
+curl -sS https://getcomposer.org/installer \
+| exec_cmd php -- --install-dir="$final_path"
+
 # Update PHP dependencies using composer
 (exec_cmd php composer.phar config --global discard-changes true \
  && exec_cmd php composer.phar install --no-interaction) \
@@ -160,9 +142,9 @@ if [[ "$ssoenabled" = "No" ]]; then
     ynh_app_setting_set "$app" skipped_uris "/"
     exec_cmd php mud.php config --xmppwhitelist=$domain
     yunohost app ssowatconf
+    undo_sso_patch
 else
     ynh_app_setting_set "$app" unprotected_uris "/"
-    apply_sso_patch
 fi
 
 
diff --git a/patches/sso-logout.patch b/sources/patches/app-00-sso-logout.patch
similarity index 100%
rename from patches/sso-logout.patch
rename to sources/patches/app-00-sso-logout.patch