diff --git a/scripts/install b/scripts/install
index 4e898b4..664e927 100644
--- a/scripts/install
+++ b/scripts/install
@@ -94,7 +94,7 @@ ynh_setup_source "$final_path"
 #=================================================
 
 virtualenv --system-site-packages "$final_path"
-bash -c "source $final_path/bin/activate && pip install --requirement $final_path/requirements-ynh.txt"
+bash -c "source $final_path/bin/activate && pip install -U pip setuptools && pip install --requirement $final_path/requirements-ynh.txt"
 
 #=================================================
 # CONFIGURE SEARX
diff --git a/scripts/upgrade b/scripts/upgrade
index 7c6c81f..e2eac75 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -93,8 +93,9 @@ ynh_system_user_create $app
 # UPGRADE SEARX IN ITS VIRTUALENV
 #=================================================
 
+rm -r $final_path/lib/python2.7/site-packages/{pip,setuptools} $final_path/lib/python2.7/site-packages/setuptools-* $final_path/lib/python2.7/site-packages/pip-*
 virtualenv --system-site-packages "$final_path"
-bash -c "source $final_path/bin/activate && pip install --requirement $final_path/requirements-ynh.txt --upgrade"
+bash -c "source $final_path/bin/activate && pip install -U pip setuptools && pip install --requirement $final_path/requirements-ynh.txt --upgrade"
 
 #=================================================
 # CONFIGURE SEARX