diff --git a/CHANGELOG.md b/CHANGELOG.md
index b38ce90..e0614b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1039,3 +1039,8 @@
 * Update Synapse to 1.91.0
 * [Full changelog](https://github.com/matrix-org/synapse/releases/tag/v1.91.0)
 
+[1.75.1]
+* Update Synapse to 1.91.1
+* [Full changelog](https://github.com/matrix-org/synapse/releases/tag/v1.91.1)
+* Fix a performance regression introduced in Synapse 1.91.0 where event persistence would cause an excessive linear growth in CPU usage. (#16220)
+
diff --git a/CloudronManifest.json b/CloudronManifest.json
index 7e2a521..b012773 100644
--- a/CloudronManifest.json
+++ b/CloudronManifest.json
@@ -5,8 +5,8 @@
   "description": "file://DESCRIPTION.md",
   "changelog": "file://CHANGELOG.md",
   "tagline": "Secure & decentralized communication",
-  "version": "1.75.0",
-  "upstreamVersion": "1.91.0",
+  "version": "1.75.1",
+  "upstreamVersion": "1.91.1",
   "healthCheckPath": "/",
   "httpPort": 8008,
   "memoryLimit": 536870912,
diff --git a/Dockerfile b/Dockerfile
index 123b8d0..5a73d81 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,7 @@ RUN virtualenv -p python3 /app/code/env
 ENV VIRTUAL_ENV=/app/code/env
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 
-ARG VERSION=1.91.0
+ARG VERSION=1.91.1
 
 # https://github.com/matrix-org/synapse-s3-storage-provider
 ARG STORAGE_PROVIDER_VERSION=1beb6af95e1f5caedb8e6e7e1cc176cdb2106d37