diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index c0d1696..484bcf0 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+2.0 - `master`_
+~~~~~~~~~~~~~~~
+
+.. note:: This version is not yet released and is under active development.
+
 1.9 - 2017-05-29
 ~~~~~~~~~~~~~~~~
 
diff --git a/src/cryptography/__about__.py b/src/cryptography/__about__.py
index 2538459..1573f69 100644
--- a/src/cryptography/__about__.py
+++ b/src/cryptography/__about__.py
@@ -14,7 +14,7 @@
                " and primitives to Python developers.")
 __uri__ = "https://github.com/pyca/cryptography"
 
-__version__ = "1.9"
+__version__ = "2.0.dev1"
 
 __author__ = "The cryptography developers"
 __email__ = "cryptography-dev@python.org"
diff --git a/src/cryptography/utils.py b/src/cryptography/utils.py
index 16c0500..cb7137c 100644
--- a/src/cryptography/utils.py
+++ b/src/cryptography/utils.py
@@ -15,7 +15,7 @@
 # ubiquity of their use. They should not be removed until we agree on when that
 # cycle ends.
 PersistentlyDeprecated = DeprecationWarning
-DeprecatedIn19 = PendingDeprecationWarning
+DeprecatedIn19 = DeprecationWarning
 
 
 def read_only_property(name):
diff --git a/vectors/cryptography_vectors/__about__.py b/vectors/cryptography_vectors/__about__.py
index b9f4447..8a6b3ae 100644
--- a/vectors/cryptography_vectors/__about__.py
+++ b/vectors/cryptography_vectors/__about__.py
@@ -14,7 +14,7 @@
 
 __uri__ = "https://github.com/pyca/cryptography"
 
-__version__ = "1.9"
+__version__ = "2.0.dev1"
 
 __author__ = "The cryptography developers"
 __email__ = "cryptography-dev@python.org"