diff --git a/docs/conf.py b/docs/conf.py
index e9b17b6..cb9035d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -61,9 +61,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '2.2.0'
+version = '2.2.1'
 # The full version, including alpha/beta/rc tags.
-release = '2.2.0'
+release = '2.2.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/setup.cfg b/setup.cfg
index cdcbe31..ef06522 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 2.2.0
+current_version = 2.2.1
 commit = True
 tag = True
 
diff --git a/taxii2client/__init__.py b/taxii2client/__init__.py
index 96d8685..6625315 100644
--- a/taxii2client/__init__.py
+++ b/taxii2client/__init__.py
@@ -15,7 +15,7 @@
 log.addHandler(ch)
 
 
-DEFAULT_USER_AGENT = "taxii2-client/2.2.0"
+DEFAULT_USER_AGENT = "taxii2-client/2.2.1"
 MEDIA_TYPE_STIX_V20 = "application/vnd.oasis.stix+json; version=2.0"
 MEDIA_TYPE_TAXII_V20 = "application/vnd.oasis.taxii+json; version=2.0"
 MEDIA_TYPE_TAXII_V21 = "application/taxii+json; version=2.1"
diff --git a/taxii2client/version.py b/taxii2client/version.py
index 8a124bf..b19ee4b 100644
--- a/taxii2client/version.py
+++ b/taxii2client/version.py
@@ -1 +1 @@
-__version__ = "2.2.0"
+__version__ = "2.2.1"