diff --git a/docs/conf.py b/docs/conf.py
index 4bff4f187..10839a8dc 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -27,7 +27,7 @@
 root_url = root_url if root_url.endswith("/") else root_url + "/"
 
 # The full version, including alpha/beta/rc tags
-release = "1.3.0"
+release = "1.4.0-rc1"
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/docs/developer-guide/api/concrete.ml.quantization.quantized_module.md b/docs/developer-guide/api/concrete.ml.quantization.quantized_module.md
index 881e636db..02f231217 100644
--- a/docs/developer-guide/api/concrete.ml.quantization.quantized_module.md
+++ b/docs/developer-guide/api/concrete.ml.quantization.quantized_module.md
@@ -72,7 +72,7 @@ ______________________________________________________________________
 ### <kbd>method</kbd> `bitwidth_and_range_report`
 
 ```python
-bitwidth_and_range_report() → Optional[Dict[str, Dict[str, Union[Tuple[int, ], int]]]]
+bitwidth_and_range_report() → Union[Dict[str, Dict[str, Union[Tuple[int, ], int]]], NoneType]
 ```
 
 Report the ranges and bit-widths for layers that mix encrypted integer values.
diff --git a/docs/developer-guide/api/concrete.ml.quantization.quantized_module_passes.md b/docs/developer-guide/api/concrete.ml.quantization.quantized_module_passes.md
index 56b77818a..205e213a6 100644
--- a/docs/developer-guide/api/concrete.ml.quantization.quantized_module_passes.md
+++ b/docs/developer-guide/api/concrete.ml.quantization.quantized_module_passes.md
@@ -41,7 +41,7 @@ ______________________________________________________________________
 ### <kbd>method</kbd> `compute_op_predecessors`
 
 ```python
-compute_op_predecessors() → DefaultDict[Optional[QuantizedOp], List[Tuple[Optional[QuantizedOp], str]]]
+compute_op_predecessors() → DefaultDict[Union[QuantizedOp, NoneType], List[Tuple[Union[QuantizedOp, NoneType], str]]]
 ```
 
 Compute the predecessors for each QuantizedOp in a QuantizedModule.
@@ -61,7 +61,7 @@ ______________________________________________________________________
 ```python
 detect_patterns(
     predecessors: DefaultDict[Optional[QuantizedOp], List[Tuple[Optional[QuantizedOp], str]]]
-) → Dict[QuantizedMixingOp, Tuple[List[Optional[QuantizedOp]], Optional[QuantizedOp]]]
+) → Dict[QuantizedMixingOp, Tuple[List[Union[QuantizedOp, NoneType]], Union[QuantizedOp, NoneType]]]
 ```
 
 Detect the patterns that can be optimized with roundPBS in the QuantizedModule.
@@ -107,7 +107,7 @@ ______________________________________________________________________
 ### <kbd>method</kbd> `process`
 
 ```python
-process() → Dict[QuantizedMixingOp, Tuple[List[Optional[QuantizedOp]], Optional[QuantizedOp]]]
+process() → Dict[QuantizedMixingOp, Tuple[List[Union[QuantizedOp, NoneType]], Union[QuantizedOp, NoneType]]]
 ```
 
 Analyze an ONNX graph and detect Gemm/Conv patterns that can use RoundPBS.
@@ -129,7 +129,7 @@ ______________________________________________________________________
 ```python
 process_patterns(
     valid_paths: Dict[QuantizedMixingOp, Tuple[List[Optional[QuantizedOp]], Optional[QuantizedOp]]]
-) → Dict[QuantizedMixingOp, Tuple[List[Optional[QuantizedOp]], Optional[QuantizedOp]]]
+) → Dict[QuantizedMixingOp, Tuple[List[Union[QuantizedOp, NoneType]], Union[QuantizedOp, NoneType]]]
 ```
 
 Configure the rounding bits of roundPBS for the optimizable operations.
diff --git a/pyproject.toml b/pyproject.toml
index c191346ec..d01859f6a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "concrete-ml"
-version = "1.3.0"
+version = "1.4.0-rc1"
 description = "Concrete ML is an open-source set of tools which aims to simplify the use of fully homomorphic encryption (FHE) for data scientists."
 license = "BSD-3-Clause-Clear"
 authors = [
diff --git a/src/concrete/ml/version.py b/src/concrete/ml/version.py
index 263ca74bf..911e64daf 100644
--- a/src/concrete/ml/version.py
+++ b/src/concrete/ml/version.py
@@ -1,3 +1,3 @@
 """File to manage the version of the package."""
 # Auto-generated by "make set_version" do not modify
-__version__ = "1.3.0"
+__version__ = "1.4.0-rc1"