diff --git a/.bump.cfg b/.bump.cfg
index 0e967df..f0e15a6 100644
--- a/.bump.cfg
+++ b/.bump.cfg
@@ -1,7 +1,7 @@
 date_fmt = 'YYYY-MM-DD'
 major = 2
 minor = 1
-patch = 0
+patch = 1
 date = [
     'quantiphy.py      __released__',
     'README.rst        Released',
diff --git a/README.rst b/README.rst
index d16547a..2a023c0 100644
--- a/README.rst
+++ b/README.rst
@@ -1,8 +1,8 @@
 QuantiPhy - Physical Quantities
 ===============================
 
-| Version: 2.1.0
-| Released: 2017-07-30
+| Version: 2.1.1
+| Released: 2017-08-07
 |
 
 .. image:: https://img.shields.io/travis/KenKundert/quantiphy/master.svg
diff --git a/doc/conf.py b/doc/conf.py
index f9ae1e6..d181edb 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -48,7 +48,7 @@
 # built documents.
 #
 # The full version, including alpha/beta/rc tags.
-release = '2.1.0'
+release = '2.1.1'
 # The short X.Y version.
 version = '.'.join(release.split('.')[0:2])
 
diff --git a/doc/index.rst b/doc/index.rst
index 839fece..9226863 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -1,8 +1,8 @@
 QuantiPhy: Physical Quantities
 ==============================
 
-| Version: 2.1.0
-| Released: 2017-07-30
+| Version: 2.1.1
+| Released: 2017-08-07
 | Please post all bugs and suggestions at
   `Github <https://github.com/KenKundert/quantiphy/issues>`_
   (or contact me directly at
diff --git a/doc/releases.rst b/doc/releases.rst
index 91f2572..7fc9b01 100644
--- a/doc/releases.rst
+++ b/doc/releases.rst
@@ -54,5 +54,5 @@ Releases
     - removed constraint in extract() that names must be identifiers
 
 **Latest development release**:
-    | Version: 2.1.0
-    | Released: 2017-07-30
+    | Version: 2.1.1
+    | Released: 2017-08-07
diff --git a/quantiphy.py b/quantiphy.py
index 84f86f2..f20a86c 100644
--- a/quantiphy.py
+++ b/quantiphy.py
@@ -277,8 +277,8 @@ def add_constant(value, alias=None, unit_systems=None):
             _constants[None][value.name] = value
 
 # Globals {{{1
-__version__ = '2.1.0'
-__released__ = '2017-07-30'
+__version__ = '2.1.1'
+__released__ = '2017-08-07'
 
 # These mappings are only used when reading numbers
 # The key for these mappings must be a single character
diff --git a/setup.py b/setup.py
index f007094..3cc03a2 100644
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@
 
 setup(
     name='quantiphy',
-    version='2.1.0',
+    version='2.1.1',
     description='physical quantities (numbers with units)',
     long_description=readme,
     author="Ken Kundert",