diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b7b81f7..45b7ca20 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,17 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [3.1.1] - 2021-01-12
+
+### Added
+
+- support for lz4 compression (compled in when library is found)
+
+### Changed
+
+- update to libosmium 2.16.0
+- update to pybind11 2.6.1
+
 ## [3.1.0] - 2020-11-03
 
 ### Added
diff --git a/setup.py b/setup.py
index 2a59d5ea..c5ad7ba1 100644
--- a/setup.py
+++ b/setup.py
@@ -144,6 +144,7 @@ def build_extension(self, ext):
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: C++",
         ],
diff --git a/src/osmium/version.py b/src/osmium/version.py
index 6e9a2986..6cfe9647 100644
--- a/src/osmium/version.py
+++ b/src/osmium/version.py
@@ -5,11 +5,11 @@
 # the major version
 pyosmium_major = '3.1'
 # current release (Pip version)
-pyosmium_release = '3.1.0'
+pyosmium_release = '3.1.1'
 
 # libosmium version shipped with the Pip release
 libosmium_version = '2.15.6'
 # protozero version shipped with the Pip release
 protozero_version = '1.7.0'
 # pybind11 version shipped with the Pip release
-pybind11_version = '2.6.0'
+pybind11_version = '2.6.1'