diff --git a/conf/nginx.conf b/conf/nginx.conf
index 0d9b249..3d13167 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -1,5 +1,5 @@
 location PATHTOCHANGE/static/ {
-    alias   /opt/yunohost/ihatemoney/venv/lib/python3.4/site-packages/ihatemoney/static/;
+    alias   /opt/yunohost/ihatemoney/venv/lib/pythonPYTHON_VERSION/site-packages/ihatemoney/static/;
 }
 location PATHTOCHANGE {
     # Force https.
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 42e551e..4b92e55 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -42,8 +42,11 @@ init_virtualenv () {
 configure_nginx () {
     local domain=$1
     local path=$2
+    local python_version="$(readlink /usr/bin/python3|sed s/.*python//)"
+
 
     sed -i "s@PATHTOCHANGE@$path@g" ../conf/nginx.conf
+    sed -i "s@PYTHON_VERSION@$python_version@g" ../conf/nginx.conf
     # Fix double-slash for domain-root install
     sed -i "s@location //@location /@" ../conf/nginx.conf
     sudo install -o root -g root -m644 \
diff --git a/scripts/upgrade b/scripts/upgrade
index acbb0f7..a10e6a2 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -19,6 +19,8 @@ path=$(ynh_app_setting_get $app path)
 is_public=$(ynh_app_setting_get "$app" is_public)
 
 VENV_PY_VERSION=$(echo ${INSTALL_DIR}/venv/bin/python*.*|sed 's/.*python//')
+SYSTEM_PY_VERSION=$(readlink /usr/bin/python3|sed s/.*python//)
+
 # Source local utils
 source _common.sh
 
@@ -67,6 +69,18 @@ fi
 
 
 
+# MIGRATION: minor Py version has changed ? rebuilt venv
+
+# Useful for  Py 3.4 → 3.5, Jessie → Stretch, ynh 2.x → 3.x
+if [[ "$VENV_PY_VERSION" != '2.7' ]] && [[ "$VENV_PY_VERSION" != "$SYSTEM_PY_VERSION" ]]
+then
+    sudo mv ${INSTALL_DIR}/venv ${INSTALL_DIR}/venv-old
+    init_virtualenv
+
+    # the static path changed
+    configure_nginx "$domain" "$path"
+fi
+
 #-------------------------------UPGRADE-------------------------