diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 0b4ea8a..5203cb5 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,3 +1,12 @@
+2.6.6
+=====
+* Updated typeguard and deal to latest versions (#284)
+
+  This change is needed so that distributions can successfully run
+  the necessary tests with the development dependencies. Previously,
+  the dependencies were outdated, and the old versions were already
+  deprecated in distributions (notably, typegard and deal).
+
 2.6.5
 =====
 * Added Python 3.11 to the list of supported Pythons (#280)
diff --git a/icontract/__init__.py b/icontract/__init__.py
index fc24076..4dfd61f 100644
--- a/icontract/__init__.py
+++ b/icontract/__init__.py
@@ -8,7 +8,7 @@
 # imports in setup.py.
 
 # Don't forget to update the version in __init__.py and CHANGELOG.rst!
-__version__ = "2.6.5"
+__version__ = "2.6.6"
 __author__ = "Marko Ristin"
 __copyright__ = "Copyright 2019 Parquery AG"
 __license__ = "MIT"
diff --git a/setup.py b/setup.py
index 6acfaa4..b7a31a6 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
 setup(
     name="icontract",
     # Don't forget to update the version in __init__.py and CHANGELOG.rst!
-    version="2.6.5",
+    version="2.6.6",
     description="Provide design-by-contract with informative violation messages.",
     long_description=long_description,
     url="https://github.com/Parquery/icontract",