diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3b1b9431..988d7982 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 # Changelog
 
+## Version 0.9.0 (2020-10-31)
+
 * Dependencies and Python version support:
+  - Package dependent on ``Particle`` version 0.13.
   - Support for Python 3.9 added.
 
 ## Version 0.8.0 (2020-09-29)
diff --git a/decaylanguage/_version.py b/decaylanguage/_version.py
index fca40605..a2283710 100644
--- a/decaylanguage/_version.py
+++ b/decaylanguage/_version.py
@@ -4,7 +4,7 @@
 # or https://github.com/scikit-hep/decaylanguage for details.
 
 
-__version__ = '0.8.0'
+__version__ = '0.9.0'
 
 version = __version__
 version_info = __version__.split('.')
diff --git a/environment.yml b/environment.yml
index a993688d..5082580b 100644
--- a/environment.yml
+++ b/environment.yml
@@ -9,8 +9,8 @@ dependencies:
   - numpy>=1.12
   - pydot>=1.3.0
   - pip:
-    - hepunits>=1.2.0
-    - particle==0.12.*
+    - hepunits>=2.0.0
+    - particle==0.13.*
     - lark-parser>=0.8.0,<0.8.6
     - plumbum>=1.6.9
     - RISE
diff --git a/setup.py b/setup.py
index 24ec34cc..af84993e 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@
     'enum34>=1.1; python_version<"3.4"',
     'importlib_resources>=1.0; python_version<"3.7"',
     'cachetools; python_version<"3.3"',
-    'particle==0.12.*',
+    'particle==0.13.*',
     'pydot'
 ]