diff --git a/Dockerfile b/Dockerfile
index 8e7c10c..5f80e7c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG MAILPIT_VERSION=1.21.5
+ARG MAILPIT_VERSION=1.21.6
 
 #
 # Mailpit binary