diff --git a/Dockerfile b/Dockerfile
index 856583f..99a1823 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alerta/alerta-web:8.0.1
+FROM alerta/alerta-web:8.0.1@sha256:222ffede60f1918d9e3fa7d97540fc8e1ae63c041cf518f27e023808d6429976
 
 RUN /venv/bin/pip install \
     git+https://git.walbeck.it/walbeck-it/matrix-alerta.git