diff --git a/Dockerfile b/Dockerfile
index 30d1e3d..0476888 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 ARG SYNAPSE_VERSION=1.83.0
 ARG PYTHON_VERSION=3.11
-ARG ALPINE_VERSION=3.17
+ARG ALPINE_VERSION=3.18
 ARG HARDENED_MALLOC_VERSION=11
 ARG UID=991
 ARG GID=991