diff --git a/scripts/upgrade b/scripts/upgrade
index c749ec2..88d88c4 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -144,6 +144,9 @@ ynh_add_fpm_config --usage=low --footprint=low --package="$extra_php_dependencie
 #=================================================
 ynh_script_progression --message="Installing Composer..." --weight=1
 
+
+ynh_secure_remove --file="$final_path/composer.lock"
+
 # Upgrade composer itself
 ynh_install_composer --phpversion=$phpversion --workdir=$final_path --install_args="--prefer-source --no-dev"
 
@@ -152,16 +155,11 @@ ynh_install_composer --phpversion=$phpversion --workdir=$final_path --install_ar
 #=================================================
 ynh_script_progression --message="Building..."
 
-ynh_backup_if_checksum_is_different --file="$final_path/.env"
-
 # Setup application config
 ynh_add_config --template="../conf/.env.example" --destination="$final_path/.env"
 
-# Recalculate and store the checksum of the file for the next upgrade.
-ynh_store_file_checksum --file="$final_path/.env"
-
 # Setup custom user.css file
-cp ../conf/user.css.example $final_path/public/dist/user.css
+#cp ../conf/user.css.example $final_path/public/dist/user.css
 
 #=================================================
 # INSTALL AND INITIALIZE COMPOSER