diff --git a/demo/Dockerfile b/demo/Dockerfile
index 6e97a3959..561bec645 100644
--- a/demo/Dockerfile
+++ b/demo/Dockerfile
@@ -20,7 +20,7 @@ RUN CGO_ENABLED=0 make -C /src VERSION="${VERSION:-dev}" karma
 FROM alpine:3.10
 RUN apk add supervisor python && rm  -rf /tmp/* /var/cache/apk/*
 COPY demo/supervisord.conf /etc/supervisord.conf
-COPY --from=prom/alertmanager:v0.19.0 /bin/alertmanager /alertmanager
+COPY --from=prom/alertmanager:v0.20.0 /bin/alertmanager /alertmanager
 COPY --from=lmierzwa/kthxbye:v0.5 /kthxbye /kthxbye
 COPY demo/alertmanager.yaml /etc/alertmanager.yaml
 COPY demo/generator.py /generator.py