diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7195d00..3ab5d27 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Changed
+
++ Updated hydrus server version
+
 ## [3.3.0] - 2019-05-31
 
 ### Changed
diff --git a/Dockerfile b/Dockerfile
index 436177e..ac5b9a5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -40,7 +40,7 @@ RUN \
   . venv/bin/activate && \
   pip install \
     beautifulsoup4~=4.7.1 \
-    lz4~=2.1.6 \
+    lz4~=2.1.10 \
     numpy~=1.16.4 \
     pillow~=5.4.1 \
     psutil~=5.4.8 \
diff --git a/README.md b/README.md
index c8d17bf..d380338 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 This is a simple Debian-based Docker setup for running
 [hydrus server][hydrus-server] from source.
 
-The latest build runs [hydrus server version 354][hydrus-server-version].
+The latest build runs [hydrus server version 355][hydrus-server-version].
 
 ## Table of contents
 
@@ -34,7 +34,7 @@ By default, this will pull the latest build. To specify an image with a
 specific version of hydrus server, provide the version number as tag, e.g.:
 
 ```zsh
-user@local:~$ docker pull mserajnik/hydrus-server-docker:354
+user@local:~$ docker pull mserajnik/hydrus-server-docker:355
 ```
 
 See [here][docker-hub-tags] for all the available version numbers/tags.
@@ -169,13 +169,13 @@ You are welcome to help out!
 [MIT](LICENSE.md) © Michael Serajnik
 
 [hydrus-server]: http://hydrusnetwork.github.io/hydrus/
-[hydrus-server-version]: https://github.com/hydrusnetwork/hydrus/releases/tag/v354
+[hydrus-server-version]: https://github.com/hydrusnetwork/hydrus/releases/tag/v355
 [docker-hub]: https://hub.docker.com/r/mserajnik/hydrus-server-docker/
 [docker-hub-tags]: https://hub.docker.com/r/mserajnik/hydrus-server-docker/tags/
 [docker]: https://www.docker.com/
 [semantic-versioning]: https://semver.org/
 
-[hydrus-server-badge]: https://img.shields.io/badge/hydrus%20server-version%20354-blue.svg
+[hydrus-server-badge]: https://img.shields.io/badge/hydrus%20server-version%20355-blue.svg
 
 [travis]: https://travis-ci.com/mserajnik/hydrus-server-docker
 [travis-badge]: https://travis-ci.com/mserajnik/hydrus-server-docker.svg
diff --git a/hydrus b/hydrus
index e556dba..097cfaa 160000
--- a/hydrus
+++ b/hydrus
@@ -1 +1 @@
-Subproject commit e556dbadf5443c5f0c4ac6b049baf839d77f4d3f
+Subproject commit 097cfaaff8442a4d1e8fc99b3099b7dbecb4c4c1