diff --git a/scripts/_common.sh b/scripts/_common.sh
index baab404..fe755ba 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -26,9 +26,6 @@ init_composer() {
         php -- --quiet --install-dir="$destdir" \
     || ynh_die "Unable to install Composer"
 
-  # install composer.json
-  cp "${destdir}/composer.json-dist" "${destdir}/composer.json"
-
   # update dependencies to create composer.lock
   exec_composer "$destdir" install --no-dev \
     || ynh_die "Unable to update Roundcube core dependencies"
diff --git a/scripts/install b/scripts/install
index 822a3db..9fda0c2 100644
--- a/scripts/install
+++ b/scripts/install
@@ -122,7 +122,7 @@ ynh_store_file_checksum "$final_path/config.inc.php"
 init_composer "$final_path"
 
 # Install dependencies
-exec_composer update --no-dev
+exec_composer "$final_path" update --no-dev
 
 #=================================================
 # GENERIC FINALIZATION
diff --git a/scripts/upgrade b/scripts/upgrade
index 082d6d1..3bd8553 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -138,7 +138,7 @@ ynh_store_file_checksum "$final_path/config.inc.php"
 init_composer "$final_path"
 
 # Install dependencies
-exec_composer update --no-dev
+exec_composer "$final_path" update --no-dev
 
 #=================================================
 # GENERIC FINALIZATION