diff --git a/docs/misc/changelog.rst b/docs/misc/changelog.rst
index b4e42d8..3fb41de 100644
--- a/docs/misc/changelog.rst
+++ b/docs/misc/changelog.rst
@@ -4,14 +4,14 @@ Changelog
 ==========
 
 
-Release 1.3.1a9 (WIP)
+Release 1.4.0 (2021-10-23)
 -------------------------------
-**Add TRPO and ARS**
+**Add Trust Region Policy Optimization (TRPO)  and Augmented Random Search (ARS) algorithms**
 
 Breaking Changes:
 ^^^^^^^^^^^^^^^^^
 - Dropped python 3.6 support
-- Upgraded to Stable-Baselines3 >= 1.3.1a9
+- Upgraded to Stable-Baselines3 >= 1.4.0
 - ``MaskablePPO`` was updated to match latest SB3 ``PPO`` version (timeout handling and new method for the policy object)
 
 New Features:
diff --git a/docs/modules/ars.rst b/docs/modules/ars.rst
index 7ca1141..de258c2 100644
--- a/docs/modules/ars.rst
+++ b/docs/modules/ars.rst
@@ -48,10 +48,10 @@ Can I use?
 ============= ====== ===========
 Space         Action Observation
 ============= ====== ===========
-Discrete      ✔️       ❌
+Discrete      ✔️       ✔️
 Box           ✔️       ✔️
-MultiDiscrete ❌       ❌
-MultiBinary   ❌       ❌
+MultiDiscrete ❌       ✔️
+MultiBinary   ❌       ✔️
 Dict          ❌       ❌
 ============= ====== ===========
 
diff --git a/sb3_contrib/version.txt b/sb3_contrib/version.txt
index 89cccac..88c5fb8 100644
--- a/sb3_contrib/version.txt
+++ b/sb3_contrib/version.txt
@@ -1 +1 @@
-1.3.1a9
+1.4.0
diff --git a/setup.py b/setup.py
index 8da3d1d..cb054b7 100644
--- a/setup.py
+++ b/setup.py
@@ -63,7 +63,7 @@ setup(
     packages=[package for package in find_packages() if package.startswith("sb3_contrib")],
     package_data={"sb3_contrib": ["py.typed", "version.txt"]},
     install_requires=[
-        "stable_baselines3>=1.3.1a9",
+        "stable_baselines3>=1.4.0",
     ],
     description="Contrib package of Stable Baselines3, experimental code.",
     author="Antonin Raffin",