diff --git a/scripts/install b/scripts/install
index b5d3dfe..5ee7aef 100644
--- a/scripts/install
+++ b/scripts/install
@@ -122,8 +122,15 @@ ynh_mysql_connect_as --user="$db_name" --password="$db_pwd" --database="$db_name
 #=================================================
 ynh_script_progression --message="Configuring Roundcube..."
 
-deskey=$(ynh_string_random --length=24)
-ynh_add_config --template="../conf/config.inc.php" --destination="$final_path/config/config.inc.php"
+rc_conf="$final_path/config/config.inc.php"
+
+cp ../conf/config.inc.php "$rc_conf"
+
+ynh_replace_string --match_string="__DESKEY__" --replace_string="$(ynh_string_random --length=24)" --target_file="$rc_conf"
+ynh_replace_string --match_string="__DB_USER__" --replace_string="$db_name" --target_file="$rc_conf"
+ynh_replace_string --match_string="__DB_PWD__" --replace_string="$db_pwd" --target_file="$rc_conf"
+ynh_replace_string --match_string="__DB_NAME__" --replace_string="$db_name" --target_file="$rc_conf"
+ynh_replace_string --match_string="__LANGUAGE__" --replace_string="$language" --target_file="$rc_conf"
 
 #=================================================
 # INSTALL ADDITIONAL PLUGINS
diff --git a/scripts/upgrade b/scripts/upgrade
index dfa5ae1..550080a 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -144,8 +144,17 @@ then
     ynh_script_progression --message="Reconfiguring Roundcube..."
 
     rc_conf="$final_path/config/config.inc.php"
-    deskey=$(ynh_string_random --length=24)
-    ynh_add_config --template="../conf/config.inc.php" --destination="$final_path/config/config.inc.php"
+
+    # Verify the checksum and backup the file if it's different
+    ynh_backup_if_checksum_is_different "$rc_conf"
+
+    cp ../conf/config.inc.php "$rc_conf"
+
+    ynh_replace_string --match_string="__DESKEY__" --replace_string="$(ynh_string_random --length=24)" --target_file="$rc_conf"
+    ynh_replace_string --match_string="__DB_USER__" --replace_string=$db_name --target_file="$rc_conf"
+    ynh_replace_string --match_string="__DB_PWD__" --replace_string="$db_pwd" --target_file="$rc_conf"
+    ynh_replace_string --match_string="__DB_NAME__" --replace_string="$db_name" --target_file="$rc_conf"
+    ynh_replace_string --match_string="__LANGUAGE__" --replace_string="$language" --target_file="$rc_conf"
 
     #=================================================
     # UPDATE DEPENDENCIES WITH COMPOSER