diff --git a/bcdi/utils/parameters.py b/bcdi/utils/parameters.py
index 2cd643e9c..9df52b1e5 100644
--- a/bcdi/utils/parameters.py
+++ b/bcdi/utils/parameters.py
@@ -7,9 +7,10 @@
 #         Jerome Carnis, carnis_jerome@yahoo.fr
 
 """
-Definition of the correct parameters for the config files.
+Validation of configuration parameters.
 
-Parameter validation is performed over the excepted parameters.
+The validation is performed only on the expected parameters. Other parameters are simply
+discarded.
 """
 from numbers import Number, Real
 import numpy as np
diff --git a/bcdi/utils/parser.py b/bcdi/utils/parser.py
index 7d07d0cf8..47bf29a4a 100644
--- a/bcdi/utils/parser.py
+++ b/bcdi/utils/parser.py
@@ -164,7 +164,7 @@ class ConfigParser:
     file. Some validation is also realized in the class.
 
     :param file_path: path of the configuration file that contains
-    the arguments, str.
+     the arguments, str.
     :param command_line_args: an optional dictionary of command-line arguments
     """
 
diff --git a/doc/HISTORY.rst b/doc/HISTORY.rst
index 9a767be7d..fa0b0e489 100644
--- a/doc/HISTORY.rst
+++ b/doc/HISTORY.rst
@@ -1,6 +1,8 @@
 Future:
 -------
 
+* Release the constraint on scikit-image version in the requirements.
+
 * Bug: use explicitely the figure handle to save figures in `bcdi_strain.py` and
   `bcdi_preprocessing_BCDI.py`
 
diff --git a/doc/modules/utils/index.rst b/doc/modules/utils/index.rst
index d42722ebc..46614d886 100644
--- a/doc/modules/utils/index.rst
+++ b/doc/modules/utils/index.rst
@@ -30,6 +30,39 @@ API Reference
 .. automodule:: bcdi.utils.image_registration
    :members:
 
+io_helper
+^^^^^^^^^
+
+Class and decorators related to the safe opening of files.
+
+API Reference
+-------------
+
+.. automodule:: bcdi.utils.io_helper
+   :members:
+
+parameters
+^^^^^^^^^^
+
+Function related to the validation of configuration parameters.
+
+API Reference
+-------------
+
+.. automodule:: bcdi.utils.parameters
+   :members:
+
+parser
+^^^^^^
+
+Class and functions related to loading of the config file and command line parameters.
+
+API Reference
+-------------
+
+.. automodule:: bcdi.utils.parser
+   :members:
+
 validation
 ^^^^^^^^^^
 
diff --git a/environment.yml b/environment.yml
index 86a6a0b0e..d5d132fd8 100644
--- a/environment.yml
+++ b/environment.yml
@@ -8,7 +8,7 @@ dependencies:
   - python=3.9
   - numpy
   - scipy
-  - scikit-image<=0.18.3
+  - scikit-image
   - matplotlib
   - h5py
   - traits
diff --git a/requirements.txt b/requirements.txt
index 8a1dde151..1691c4575 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 numpy
 scipy
-scikit-image<=0.18.3
+scikit-image
 matplotlib
 hdf5plugin
 h5py
diff --git a/setup.py b/setup.py
index 482bbb6dc..60077d489 100644
--- a/setup.py
+++ b/setup.py
@@ -127,11 +127,11 @@
          6. Creating figures for publication using templates.""",
     url="https://github.com/carnisj/bcdi",
     project_urls={"Documentation": "https://bcdi.readthedocs.io/en/latest/"},
-    python_requires=">=3.6*",
+    python_requires=">=3.6*, <3.10",
     install_requires=[
         "numpy",
         "scipy",
-        "scikit-image<=0.18.3",
+        "scikit-image",
         "matplotlib",
         "hdf5plugin",
         "h5py",