diff --git a/Dockerfile b/Dockerfile
index c932155..7a1bccf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG SYNAPSE_VERSION=1.90.0
+ARG SYNAPSE_VERSION=1.91.0
 ARG PYTHON_VERSION=3.11
 ARG HARDENED_MALLOC_VERSION=11
 ARG UID=991