diff --git a/helpers/helpers.v1.d/mongodb b/helpers/helpers.v1.d/mongodb
index 8736aad31..edfbc5491 100644
--- a/helpers/helpers.v1.d/mongodb
+++ b/helpers/helpers.v1.d/mongodb
@@ -293,6 +293,7 @@ ynh_mongo_remove_db() {
 }
 
 # Install MongoDB and integrate MongoDB service in YunoHost
+# It can upgrade / downgrade the desired mongo version to ensure a compatible one is installed
 #
 # usage: ynh_install_mongo [--mongo_version=mongo_version]
 # | arg: -m, --mongo_version=		- Version of MongoDB to install
@@ -310,16 +311,48 @@ ynh_install_mongo() {
 	ynh_print_info --message="Installing MongoDB Community Edition ..."
 	local mongo_debian_release=$(ynh_get_debian_release)
 
-    if [[ "$(grep '^flags' /proc/cpuinfo | uniq)" != *"avx"* && "$mongo_version" != "4.4" ]]; then
+  if [[ "$(grep '^flags' /proc/cpuinfo | uniq)" != *"avx"* && "$mongo_version" != "4.4" ]]; then
     ynh_print_warn --message="Installing Mongo 4.4 as $mongo_version is not compatible with your cpu (see https://docs.mongodb.com/manual/administration/production-notes/#x86_64)."
     mongo_version="4.4"
   fi
-  if [[ "$mongo_version" == "4.4" ]]; then
-    ynh_print_warn --message="Switched to buster install as Mongo 4.4 is not compatible with $mongo_debian_release."
-    mongo_debian_release=buster
-  fi
+  
+	if [[ "$mongo_version" == "4.4" ]]; then
+		ynh_print_warn --message="Switched to buster install as Mongo 4.4 is not compatible with $mongo_debian_release."
+		mongo_debian_release=buster
+	fi
 
-	ynh_install_extra_app_dependencies --repo="deb http://repo.mongodb.org/apt/debian $mongo_debian_release/mongodb-org/$mongo_version main" --package="mongodb-org mongodb-org-server mongodb-org-tools mongodb-mongosh" --key="https://www.mongodb.org/static/pgp/server-$mongo_version.asc"
+	if [[ "$mongo_debian_release" == "bookworm" && "$mongo_version" != "7."* ]]; then
+		ynh_print_warn --message="Switched to Mongo v7 as $mongo_version is not compatible with $mongo_debian_release"
+		mongo_version = "7.0"
+	fi
+
+	# Check if MongoDB is already installed
+	local install_package=true
+	local current_version=$(ynh_package_version --package="mongodb-org-server")
+	# Focus only the major, minor versions
+	current_version=$(cut -c 1-3 <<< "$current_version")
+	
+	if [[ "a$current_version" != "a" ]]; then
+		if (( $(bc <<< "$current_version < $mongo_version") )); then
+			if (( $(bc <<< "scale = 0 ; x = $mongo_version / 1 - $current_version / 1; x > 1.0" ))); then
+				# Mongo only support upgrading a major version to another
+				ynh_print_err --message="Upgrading Mongo from version  $current_version to $mongo_version is not supported"
+				install_package=false
+			else
+				ynh_print_info --message="Upgrading Mongo from version $current_version to $mongo_version"
+			fi
+		else
+			if (( $(bc <<< "$current_version >= $mongo_version") )); then
+				ynh_print_warn --message="Mongo version $current_version is already installed and will be kept instead of requested version $mongo_version"
+				install_package=false
+			fi
+		fi
+	fi
+
+	if [[ "$install_package" = true ]]; then
+		ynh_install_extra_app_dependencies --repo="deb http://repo.mongodb.org/apt/debian $mongo_debian_release/mongodb-org/$mongo_version main" --package="mongodb-org mongodb-org-server mongodb-org-tools mongodb-mongosh" --key="https://www.mongodb.org/static/pgp/server-$mongo_version.asc"
+	fi
+	
 	mongodb_servicename=mongod
 
 	# Make sure MongoDB is started and enabled
diff --git a/helpers/helpers.v2.1.d/mongodb b/helpers/helpers.v2.1.d/mongodb
index 3fb851277..8d0fc4650 100644
--- a/helpers/helpers.v2.1.d/mongodb
+++ b/helpers/helpers.v2.1.d/mongodb
@@ -214,6 +214,7 @@ ynh_mongo_remove_db() {
 }
 
 # Install MongoDB and integrate MongoDB service in YunoHost
+# It can upgrade / downgrade the desired mongo version to ensure a compatible one is installed
 #
 # The installed version is defined by $mongo_version which should be defined as global prior to calling this helper
 #
@@ -235,22 +236,53 @@ ynh_install_mongo() {
         mongo_debian_release=buster
     fi
 
+	if [[ "$mongo_debian_release" == "bookworm" && "$mongo_version" != "7."* ]]; then
+		ynh_print_warn --message="Switched to Mongo v7 as $mongo_version is not compatible with $mongo_debian_release"
+		mongo_version = "7.0"
+	fi
+
+	# Check if MongoDB is already installed
+	local install_package=true
+	local current_version=$(ynh_package_version --package="mongodb-org-server")
+	# Focus only the major, minor versions
+	current_version=$(cut -c 1-3 <<< "$current_version")
+	
+	if [[ "a$current_version" != "a" ]]; then
+		if (( $(bc <<< "$current_version < $mongo_version") )); then
+			if (( $(bc <<< "scale = 0 ; x = $mongo_version / 1 - $current_version / 1; x > 1.0" ))); then
+				# Mongo only support upgrading a major version to another
+				ynh_print_err --message="Upgrading Mongo from version  $current_version to $mongo_version is not supported"
+				install_package=false
+			else
+				ynh_print_info --message="Upgrading Mongo from version $current_version to $mongo_version"
+			fi
+		else
+			if (( $(bc <<< "$current_version >= $mongo_version") )); then
+				ynh_print_warn --message="Mongo version $current_version is already installed and will be kept instead of requested version $mongo_version"
+				install_package=false
+			fi
+		fi
+	fi
+
+	if [[ "$install_package" = true ]]; then
     ynh_apt_install_dependencies_from_extra_repository \
         --repo="deb http://repo.mongodb.org/apt/debian $mongo_debian_release/mongodb-org/$mongo_version main" \
         --package="mongodb-org mongodb-org-server mongodb-org-tools mongodb-mongosh" \
         --key="https://www.mongodb.org/static/pgp/server-$mongo_version.asc"
-    mongodb_servicename=mongod
+  fi
+
+  mongodb_servicename=mongod
 
     # Make sure MongoDB is started and enabled
-    systemctl enable $mongodb_servicename --quiet
-    systemctl daemon-reload --quiet
-    ynh_systemctl --service=$mongodb_servicename --action=restart --wait_until="aiting for connections" --log_path="/var/log/mongodb/$mongodb_servicename.log"
+  systemctl enable $mongodb_servicename --quiet
+  systemctl daemon-reload --quiet
+  ynh_systemctl --service=$mongodb_servicename --action=restart --wait_until="aiting for connections" --log_path="/var/log/mongodb/$mongodb_servicename.log"
 
     # Integrate MongoDB service in YunoHost
-    yunohost service add $mongodb_servicename --description="MongoDB daemon" --log="/var/log/mongodb/$mongodb_servicename.log"
+  yunohost service add $mongodb_servicename --description="MongoDB daemon" --log="/var/log/mongodb/$mongodb_servicename.log"
 
     # Store mongo_version into the config of this app
-    ynh_app_setting_set --key=mongo_version --value=$mongo_version
+  ynh_app_setting_set --key=mongo_version --value=$mongo_version
 }
 
 # Remove MongoDB