diff --git a/check_process b/check_process
index 634a3da..8a7cdfd 100644
--- a/check_process
+++ b/check_process
@@ -12,17 +12,17 @@
 		setup_public=1
 		upgrade=1
 		# 1.07~ynh2
-		upgrade=1	from_commit=37d226544f2738bd37f97b612ff4798545b3dc5a
+		# upgrade=1	from_commit=37d226544f2738bd37f97b612ff4798545b3dc5a
 		# 2.09~ynh1
-		upgrade=1	from_commit=3105eb5a3c515ea55a38b8b80c9b5dda1277a82e
+		# upgrade=1	from_commit=3105eb5a3c515ea55a38b8b80c9b5dda1277a82e
 		# 2.56~ynh2
-		upgrade=1	from_commit=b26768aad2627da739677da740429591ffbb9a6e
+		# upgrade=1	from_commit=b26768aad2627da739677da740429591ffbb9a6e
 		# 2.98~ynh2
-		upgrade=1	from_commit=dab614bd7679f2f7978d1df2e360fba7ae0edfa4
+		# upgrade=1	from_commit=dab614bd7679f2f7978d1df2e360fba7ae0edfa4
 		# 3.45~ynh1
-		upgrade=1	from_commit=2e6131af03c723cf9eaf82e13aa9488f42c085f9
+		# upgrade=1	from_commit=2e6131af03c723cf9eaf82e13aa9488f42c085f9
 		# 3.55~ynh1
-		upgrade=1	from_commit=3be3f1d7290b534f7689222645a42c06f3103589
+		# upgrade=1	from_commit=3be3f1d7290b534f7689222645a42c06f3103589
 		backup_restore=1
 		multi_instance=1
 		# This test is no longer necessary since the version 2.7 (PR: https://github.com/YunoHost/yunohost/pull/304), you can still do it if your app could be installed with this version.
diff --git a/conf/systemd.service b/conf/systemd.service
index 9fbf394..7b13646 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -1,7 +1,7 @@
 [Unit]
 Description=Wekan, task board
-Wants=mongodb.service
-After=network.target mongodb.service
+Wants=__MONGODB_SERVICENAME__.service
+After=network.target __MONGODB_SERVICENAME__.service
 
 [Service]
 Type=simple
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 681c2d6..fe27352 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -6,6 +6,9 @@
 
 # dependencies used by the app
 pkg_dependencies="mongodb mongodb-server mongo-tools"
+pkg_dependencies_buster="mongodb-org mongodb-org-server mongodb-org-tools"
+mongodb_stretch="mongodb"
+mongodb_buster="mongod"
 nodejsversion=12.15.0
 
 #=================================================
diff --git a/scripts/install b/scripts/install
index ecc2135..347ac42 100755
--- a/scripts/install
+++ b/scripts/install
@@ -8,6 +8,7 @@
 
 source _common.sh
 source ynh_detect_arch__2
+source ynh_add_extra_apt_repos__3
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -78,7 +79,13 @@ ynh_print_info --message="Installing dependencies..."
 ynh_install_nodejs --nodejs_version=$nodejsversion
 ynh_use_nodejs
 
-ynh_install_app_dependencies $pkg_dependencies
+if [ "$(lsb_release --codename --short)" = "buster" ]; then
+	ynh_install_extra_app_dependencies --repo="deb http://repo.mongodb.org/apt/debian buster/mongodb-org/4.2 main" --package="$pkg_dependencies_buster" --key="https://www.mongodb.org/static/pgp/server-4.2.asc"
+	mongodb_servicename=$mongodb_buster
+else
+	ynh_install_app_dependencies $pkg_dependencies
+	mongodb_servicename=$mongodb_stretch
+fi
 
 #=================================================
 # CREATE A MONGODB DATABASE
@@ -86,8 +93,8 @@ ynh_install_app_dependencies $pkg_dependencies
 ynh_print_info --message="Creating a MongoDB database..."
 
 # Start mongodb
-systemctl enable mongodb
-systemctl start mongodb
+systemctl enable $mongodb_servicename
+systemctl start $mongodb_servicename
 
 # Registering db name
 db_name=$(ynh_sanitize_dbid --db_name=$app)
@@ -127,6 +134,7 @@ ynh_print_info --message="Configuring a systemd service..."
 
 # Create a dedicated systemd config
 ynh_replace_string --match_string="__NODEJS_PATH__" --replace_string="$nodejs_path" --target_file="../conf/systemd.service"
+ynh_replace_string --match_string="__MONGODB_SERVICENAME__" --replace_string="$mongodb_servicename" --target_file="../conf/systemd.service"
 ynh_add_systemd_config
 
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index cbf1c11..445e21f 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -7,7 +7,7 @@
 #=================================================
 
 source ../settings/scripts/_common.sh
-source ../settings/scripts/ynh_systemd_action
+source ../settings/scripts/ynh_add_extra_apt_repos__3
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -87,7 +87,13 @@ ynh_print_info --message="Reinstalling dependencies..."
 ynh_install_nodejs --nodejs_version=$nodejsversion
 ynh_use_nodejs
 
-ynh_install_app_dependencies $pkg_dependencies
+if [ "$(lsb_release --codename --short)" = "buster" ]; then
+	ynh_install_extra_app_dependencies --repo="deb http://repo.mongodb.org/apt/debian buster/mongodb-org/4.2 main" --package="$pkg_dependencies_buster" --key="https://www.mongodb.org/static/pgp/server-4.2.asc"
+	mongodb_servicename=$mongodb_buster
+else
+	ynh_install_app_dependencies $pkg_dependencies
+	mongodb_servicename=$mongodb_stretch
+fi
 
 #=================================================
 # RESTORE THE MONGODB DATABASE
@@ -95,8 +101,8 @@ ynh_install_app_dependencies $pkg_dependencies
 ynh_print_info --message="Restoring the MongoDB database..."
 
 # Start mongodb
-systemctl enable mongodb
-systemctl start mongodb
+systemctl enable $mongodb_servicename
+systemctl start $mongodb_servicename
 mongorestore --db $db_name ./dump/$db_name
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index fb58336..1119fca 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -7,6 +7,7 @@
 #=================================================
 
 source _common.sh
+source ynh_add_extra_apt_repos__3
 source ynh_package_version
 source ynh_detect_arch__2
 source /usr/share/yunohost/helpers
@@ -163,7 +164,13 @@ ynh_remove_nodejs
 ynh_install_nodejs --nodejs_version=$nodejsversion
 ynh_use_nodejs
 
-ynh_install_app_dependencies $pkg_dependencies
+if [ "$(lsb_release --codename --short)" = "buster" ]; then
+  ynh_install_extra_app_dependencies --repo="deb http://repo.mongodb.org/apt/debian buster/mongodb-org/4.2 main" --package="$pkg_dependencies_buster" --key="https://www.mongodb.org/static/pgp/server-4.2.asc"
+  mongodb_servicename=$mongodb_buster
+else
+  ynh_install_app_dependencies $pkg_dependencies
+  mongodb_servicename=$mongodb_stretch
+fi
 
 #=================================================
 # CREATE DEDICATED USER
@@ -196,6 +203,7 @@ ynh_print_info --message="Upgrading systemd configuration..."
 
 # Create a dedicated systemd config
 ynh_replace_string --match_string="__NODEJS_PATH__" --replace_string="$nodejs_path" --target_file="../conf/systemd.service"
+ynh_replace_string --match_string="__MONGODB_SERVICENAME__" --replace_string="$mongodb_servicename" --target_file="../conf/systemd.service"
 ynh_add_systemd_config
 
 #=================================================
diff --git a/scripts/ynh_add_extra_apt_repos__3 b/scripts/ynh_add_extra_apt_repos__3
new file mode 100644
index 0000000..3276f00
--- /dev/null
+++ b/scripts/ynh_add_extra_apt_repos__3
@@ -0,0 +1,294 @@
+#!/bin/bash
+
+# Pin a repository.
+#
+# usage: ynh_pin_repo --package=packages --pin=pin_filter [--priority=priority_value] [--name=name] [--append]
+# | arg: -p, --package - Packages concerned by the pin. Or all, *.
+# | arg: -i, --pin - Filter for the pin.
+# | arg: -p, --priority - Priority for the pin
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+# | arg: -a, --append - Do not overwrite existing files.
+#
+# See https://manpages.debian.org/stretch/apt/apt_preferences.5.en.html for information about pinning.
+#
+ynh_pin_repo () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=pirna
+	declare -Ar args_array=( [p]=package= [i]=pin= [r]=priority= [n]=name= [a]=append )
+	local package
+	local pin
+	local priority
+	local name
+	local append
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	package="${package:-*}"
+	priority=${priority:-50}
+	name="${name:-$app}"
+	append=${append:-0}
+
+	if [ $append -eq 1 ]
+	then
+		append="tee -a"
+	else
+		append="tee"
+	fi
+
+	mkdir -p "/etc/apt/preferences.d"
+	echo "Package: $package
+Pin: $pin
+Pin-Priority: $priority" \
+	| $append "/etc/apt/preferences.d/$name"
+}
+
+# Add a repository.
+#
+# usage: ynh_add_repo --uri=uri --suite=suite --component=component [--name=name] [--append]
+# | arg: -u, --uri - Uri of the repository.
+# | arg: -s, --suite - Suite of the repository.
+# | arg: -c, --component - Component of the repository.
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+# | arg: -a, --append - Do not overwrite existing files.
+#
+# Example for a repo like deb http://forge.yunohost.org/debian/ stretch stable
+#                             uri                               suite   component
+# ynh_add_repo --uri=http://forge.yunohost.org/debian/ --suite=stretch --component=stable
+#
+ynh_add_repo () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=uscna
+	declare -Ar args_array=( [u]=uri= [s]=suite= [c]=component= [n]=name= [a]=append )
+	local uri
+	local suite
+	local component
+	local name
+	local append
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	name="${name:-$app}"
+	append=${append:-0}
+
+	if [ $append -eq 1 ]
+	then
+		append="tee -a"
+	else
+		append="tee"
+	fi
+
+	mkdir -p "/etc/apt/sources.list.d"
+	# Add the new repo in sources.list.d
+	echo "deb $uri $suite $component" \
+		| $append "/etc/apt/sources.list.d/$name.list"
+}
+
+# Add an extra repository correctly, pin it and get the key.
+#
+# usage: ynh_install_extra_repo --repo="repo" [--key=key_url] [--priority=priority_value] [--name=name] [--append]
+# | arg: -r, --repo - Complete url of the extra repository.
+# | arg: -k, --key - url to get the public key.
+# | arg: -p, --priority - Priority for the pin
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+# | arg: -a, --append - Do not overwrite existing files.
+ynh_install_extra_repo () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=rkpna
+	declare -Ar args_array=( [r]=repo= [k]=key= [p]=priority= [n]=name= [a]=append )
+	local repo
+	local key
+	local priority
+	local name
+	local append
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	name="${name:-$app}"
+	append=${append:-0}
+	key=${key:-0}
+	priority=${priority:-}
+
+	if [ $append -eq 1 ]
+	then
+		append="--append"
+		wget_append="tee -a"
+	else
+		append=""
+		wget_append="tee"
+	fi
+
+	# Split the repository into uri, suite and components.
+	# Remove "deb " at the beginning of the repo.
+	repo="${repo#deb }"
+
+	# Get the uri
+	local uri="$(echo "$repo" | awk '{ print $1 }')"
+
+	# Get the suite
+	local suite="$(echo "$repo" | awk '{ print $2 }')"
+
+	# Get the components
+	local component="${repo##$uri $suite }"
+
+	# Add the repository into sources.list.d
+	ynh_add_repo --uri="$uri" --suite="$suite" --component="$component" --name="$name" $append
+
+	# Pin the new repo with the default priority, so it won't be used for upgrades.
+	# Build $pin from the uri without http and any sub path
+	local pin="${uri#*://}"
+	pin="${pin%%/*}"
+	# Set a priority only if asked
+	if [ -n "$priority" ]
+	then
+		priority="--priority=$priority"
+	fi
+	ynh_pin_repo --package="*" --pin="origin \"$pin\"" $priority --name="$name" $append
+
+	# Get the public key for the repo
+	if [ -n "$key" ]
+	then
+		mkdir -p "/etc/apt/trusted.gpg.d"
+		wget -q "$key" -O - | gpg --dearmor | $wget_append /etc/apt/trusted.gpg.d/$name.gpg > /dev/null
+	fi
+
+	# Update the list of package with the new repo
+	ynh_package_update
+}
+
+# Remove an extra repository and the assiociated configuration.
+#
+# usage: ynh_remove_extra_repo [--name=name]
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+ynh_remove_extra_repo () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=n
+	declare -Ar args_array=( [n]=name= )
+	local name
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	name="${name:-$app}"
+
+	ynh_secure_remove "/etc/apt/sources.list.d/$name.list"
+	ynh_secure_remove "/etc/apt/preferences.d/$name"
+	ynh_secure_remove "/etc/apt/trusted.gpg.d/$name.gpg"
+	ynh_secure_remove "/etc/apt/trusted.gpg.d/$name.asc"
+
+	# Update the list of package to exclude the old repo
+	ynh_package_update
+}
+
+# Install packages from an extra repository properly.
+#
+# usage: ynh_install_extra_app_dependencies --repo="repo" --package="dep1 dep2" [--key=key_url] [--name=name]
+# | arg: -r, --repo - Complete url of the extra repository.
+# | arg: -p, --package - The packages to install from this extra repository
+# | arg: -k, --key - url to get the public key.
+# | arg: -n, --name - Name for the files for this repo, $app as default value.
+ynh_install_extra_app_dependencies () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=rpkn
+	declare -Ar args_array=( [r]=repo= [p]=package= [k]=key= [n]=name= )
+	local repo
+	local package
+	local key
+	local name
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	name="${name:-$app}"
+	key=${key:-0}
+
+	# Set a key only if asked
+	if [ -n "$key" ]
+	then
+		key="--key=$key"
+	fi
+	# Add an extra repository for those packages
+	ynh_install_extra_repo --repo="$repo" $key --priority=995 --name=$name
+
+	# Install requested dependencies from this extra repository.
+	ynh_add_app_dependencies --package="$package"
+
+	# Remove this extra repository after packages are installed
+	ynh_remove_extra_repo --name=$app
+}
+
+#=================================================
+
+# patched version of ynh_install_app_dependencies to be used with ynh_add_app_dependencies
+
+# Define and install dependencies with a equivs control file
+# This helper can/should only be called once per app
+#
+# usage: ynh_install_app_dependencies dep [dep [...]]
+# | arg: dep - the package name to install in dependence
+#   You can give a choice between some package with this syntax : "dep1|dep2"
+#   Example : ynh_install_app_dependencies dep1 dep2 "dep3|dep4|dep5"
+#   This mean in the dependence tree : dep1 & dep2 & (dep3 | dep4 | dep5)
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_install_app_dependencies () {
+    local dependencies=$@
+    dependencies="$(echo "$dependencies" | sed 's/\([^\<=\>]\)\ \([^(]\)/\1, \2/g')"
+    dependencies=${dependencies//|/ | }
+    local manifest_path="../manifest.json"
+    if [ ! -e "$manifest_path" ]; then
+    	manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
+    fi
+
+    local version=$(grep '\"version\": ' "$manifest_path" | cut -d '"' -f 4)	# Retrieve the version number in the manifest file.
+    if [ ${#version} -eq 0 ]; then
+        version="1.0"
+    fi
+    local dep_app=${app//_/-}	# Replace all '_' by '-'
+
+    # Handle specific versions
+    if [[ "$dependencies" =~ [\<=\>] ]]
+    then
+        # Replace version specifications by relationships syntax
+        # https://www.debian.org/doc/debian-policy/ch-relationships.html
+        # Sed clarification
+        # [^(\<=\>] ignore if it begins by ( or < = >. To not apply twice.
+        # [\<=\>] matches < = or >
+        # \+ matches one or more occurence of the previous characters, for >= or >>.
+        # [^,]\+ matches all characters except ','
+        # Ex: package>=1.0 will be replaced by package (>= 1.0)
+        dependencies="$(echo "$dependencies" | sed 's/\([^(\<=\>]\)\([\<=\>]\+\)\([^,]\+\)/\1 (\2 \3)/g')"
+    fi
+
+    cat > /tmp/${dep_app}-ynh-deps.control << EOF	# Make a control file for equivs-build
+Section: misc
+Priority: optional
+Package: ${dep_app}-ynh-deps
+Version: ${version}
+Depends: ${dependencies}
+Architecture: all
+Description: Fake package for $app (YunoHost app) dependencies
+ This meta-package is only responsible of installing its dependencies.
+EOF
+    ynh_package_install_from_equivs /tmp/${dep_app}-ynh-deps.control \
+        || ynh_die --message="Unable to install dependencies"	# Install the fake package and its dependencies
+    rm /tmp/${dep_app}-ynh-deps.control
+    ynh_app_setting_set --app=$app --key=apt_dependencies --value="$dependencies"
+}
+
+ynh_add_app_dependencies () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=pr
+	declare -Ar args_array=( [p]=package= [r]=replace)
+	local package
+	local replace
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	replace=${replace:-0}
+
+	local current_dependencies=""
+	if [ $replace -eq 0 ]
+	then
+		local dep_app=${app//_/-}	# Replace all '_' by '-'
+		if ynh_package_is_installed --package="${dep_app}-ynh-deps"
+		then
+			current_dependencies="$(dpkg-query --show --showformat='${Depends}' ${dep_app}-ynh-deps) "
+		fi
+
+		current_dependencies=${current_dependencies// | /|}
+	fi
+
+	ynh_install_app_dependencies "${current_dependencies}${package}"
+}