diff --git a/VERSION b/VERSION
index 3d26edf77..df1243329 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-__version__ = "0.4.1"
+__version__ = "0.4.2"
diff --git a/docs/changelog.rst b/docs/changelog.rst
index b09d4c5d1..a36880a5e 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -8,6 +8,7 @@ These are new features and improvements of note in each release
     :local:
     :backlinks: top
 
+.. include::  whatsnew/v0-4-2.rst
 .. include::  whatsnew/v0-4-1.rst
 .. include::  whatsnew/v0-4-0.rst
 .. include::  whatsnew/v0-3-2.rst
diff --git a/docs/conf.py b/docs/conf.py
index 5d2f36b6d..db559d6ee 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -22,7 +22,7 @@
 year = '2014-2020'
 author = 'oemof-developer-group'
 copyright = '{0}, {1}'.format(year, author)
-version = release = '0.4.1'
+version = release = '0.4.2'
 
 pygments_style = 'trac'
 templates_path = ['.']
diff --git a/docs/whatsnew/v0-4-2.rst b/docs/whatsnew/v0-4-2.rst
index 5502a8678..79bc24c02 100644
--- a/docs/whatsnew/v0-4-2.rst
+++ b/docs/whatsnew/v0-4-2.rst
@@ -1,49 +1,4 @@
-v0.4.2 (???, 2020)
+v0.4.2 (May, 11, 2021)
 -----------------------
 
-
-API changes
-^^^^^^^^^^^^^^^^^^^^
-
-* something
-
-
-New features
-^^^^^^^^^^^^^^^^^^^^
-
-* something
-
-New components/constraints
-^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-* something
-
-Documentation
-^^^^^^^^^^^^^^^^^^^^
-
-* something
-
-Bug fixes
-^^^^^^^^^^^^^^^^^^^^
-
-* something
-
-Known issues
-^^^^^^^^^^^^^^^^^^^^
-
-* something
-
-Testing
-^^^^^^^^^^^^^^^^^^^^
-
-* something
-
-Other changes
-^^^^^^^^^^^^^^^^^^^^
-
-* something
-
-Contributors
-^^^^^^^^^^^^^^^^^^^^
-
-* something
+* Exclude Pyomo version 5.7.3, because this version causes an unusual high computing time to create a model.
diff --git a/docs/whatsnew/v0-4-3.rst b/docs/whatsnew/v0-4-3.rst
new file mode 100644
index 000000000..5502a8678
--- /dev/null
+++ b/docs/whatsnew/v0-4-3.rst
@@ -0,0 +1,49 @@
+v0.4.2 (???, 2020)
+-----------------------
+
+
+API changes
+^^^^^^^^^^^^^^^^^^^^
+
+* something
+
+
+New features
+^^^^^^^^^^^^^^^^^^^^
+
+* something
+
+New components/constraints
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+* something
+
+Documentation
+^^^^^^^^^^^^^^^^^^^^
+
+* something
+
+Bug fixes
+^^^^^^^^^^^^^^^^^^^^
+
+* something
+
+Known issues
+^^^^^^^^^^^^^^^^^^^^
+
+* something
+
+Testing
+^^^^^^^^^^^^^^^^^^^^
+
+* something
+
+Other changes
+^^^^^^^^^^^^^^^^^^^^
+
+* something
+
+Contributors
+^^^^^^^^^^^^^^^^^^^^
+
+* something
diff --git a/setup.py b/setup.py
index 1961750c9..6dbd9b00c 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@ def read(*names, **kwargs):
 
 setup(
     name="oemof.solph",
-    version="0.4.1",
+    version="0.4.2",
     license="MIT",
     description=(
         "A model generator for energy system modelling and optimisation."
@@ -86,7 +86,7 @@ def read(*names, **kwargs):
         "dill",
         "numpy",
         "pandas",
-        "pyomo >= 5.7.0, < 6.0",
+        "pyomo >= 5.7.0, !=5.7.3",
         "networkx",
         "oemof.tools",
         "oemof.network",
diff --git a/src/oemof/solph/__init__.py b/src/oemof/solph/__init__.py
index fe1078357..ddc245205 100644
--- a/src/oemof/solph/__init__.py
+++ b/src/oemof/solph/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.4.1"
+__version__ = "0.4.2"
 
 from . import constraints  # noqa: F401
 from . import custom  # noqa: F401