diff --git a/service/letsencrypt/Containerfile b/service/letsencrypt/Containerfile
index ca1cf35..bebc2cb 100644
--- a/service/letsencrypt/Containerfile
+++ b/service/letsencrypt/Containerfile
@@ -1,4 +1,4 @@
-FROM docker.io/goacme/lego:v4.8.0
+FROM docker.io/goacme/lego:v4.9.1
 
 RUN addgroup --system --gid 10000 letsencrypt
 RUN adduser --system --uid 10000 --ingroup letsencrypt --home /var/lib/letsencrypt letsencrypt