diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0a7d3f74..40cf3fca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Current version
 
+## Version 2.1.0 (2021-11-12)
+
 ### New features 
 
 * [Issue 36](https://github.com/MassimoCimmino/pygfunction/issues/36) - Added a `Coaxial` class to the `pipes` module to model boreholes with coaxial pipes.
diff --git a/doc/requirements.txt b/doc/requirements.txt
index 544e4b99..d9656e5f 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,6 @@
-numpydoc
-numpy
-scipy
-matplotlib
-CoolProp
+numpy >= 1.20.1
+scipy >= 1.6.2
+matplotlib >= 3.3.4
+numpydoc >= 1.1.0
+sphinx >= 4.0.1
+CoolProp >= 6.4.1
diff --git a/doc/source/conf.py b/doc/source/conf.py
index f2c86824..c1bf7c56 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -24,7 +24,7 @@
 
 # If your documentation needs a minimal Sphinx version, state it here.
 #
-# needs_sphinx = '1.0'
+needs_sphinx = '4.0'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
@@ -74,9 +74,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = u'2.0'
+version = u'2.1'
 # The full version, including alpha/beta/rc tags.
-release = u'2.0.0'
+release = u'2.1.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/doc/source/index.rst b/doc/source/index.rst
index 26208b68..e51f9226 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -6,9 +6,9 @@
 pygfunction
 ===========
 
-*pygfunction* is a Python package that allows the calculation thermal response
-factors - or *g*-functions - for geothermal borehole fields using analytical
-solutions.
+*pygfunction* is a Python package that allows the calculation of thermal
+response factors - or *g*-functions - for geothermal borehole fields using
+analytical solutions.
 
 .. toctree::
    :maxdepth: 2
diff --git a/pygfunction/examples/discretize_boreholes.py b/pygfunction/examples/discretize_boreholes.py
index 12b4ace2..dc34dd0c 100644
--- a/pygfunction/examples/discretize_boreholes.py
+++ b/pygfunction/examples/discretize_boreholes.py
@@ -6,7 +6,7 @@
     boundary conditions : (1) a uniform borehole wall temperature along the
     boreholes equal for all boreholes, and (2) an equal inlet fluid
     temperature into the boreholes. g-Functions using 8 segments in a
-    non-uniform deiscretization are compared to reference g-functions
+    non-uniform discretization are compared to reference g-functions
     calculated using 48 segments of equal lengths. It is shown that g-functions
     can be calculated accurately using a small number of segments.
 """
diff --git a/setup.py b/setup.py
index a1f645d0..efd96091 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@ def read(fname):
 
 setup(
     name="pygfunction",
-    version="2.0.0",
+    version="2.1.0",
     packages=['pygfunction',
               'pygfunction/examples'],
     include_package_data=True,