diff --git a/docs/conf.py b/docs/conf.py
index 0508a2ca0..74bb51dd6 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -25,7 +25,7 @@ root_url = os.environ.get("DOC_ROOT_URL", "/concrete-numpy")
 root_url = root_url if root_url.endswith('/') else root_url + '/'
 
 # The full version, including alpha/beta/rc tags
-release = "0.3.0"
+release = "0.4.0"
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/pyproject.toml b/pyproject.toml
index 78f758b76..55da74148 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "concrete-numpy"
-version = "0.3.0"
+version = "0.4.0"
 description = "Concrete Numpy is a python package that contains the tools data scientists need to compile various numpy functions into their Fully Homomorphic Encryption (FHE) equivalents. Concrete Numpy goes on top of the Concrete Library and its Compiler."
 license = "BSD-3-Clause"
 authors = [