diff --git a/Dockerfile b/Dockerfile
index 28835d4..dac088f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
-ARG SYNAPSE_VERSION=1.47.1
+ARG SYNAPSE_VERSION=1.48.0
 ARG PYTHON_VERSION=3.9
-ARG ALPINE_VERSION=3.14
+ARG ALPINE_VERSION=3.15
 ARG HARDENED_MALLOC_VERSION=8
 ARG UID=991
 ARG GID=991