diff --git a/ptvsd/__init__.py b/ptvsd/__init__.py
index dd9a5c80..7b94f47c 100644
--- a/ptvsd/__init__.py
+++ b/ptvsd/__init__.py
@@ -3,7 +3,7 @@
 # for license information.
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 import sys
 import os.path
diff --git a/ptvsd/__main__.py b/ptvsd/__main__.py
index 1fb16326..ed4a0863 100644
--- a/ptvsd/__main__.py
+++ b/ptvsd/__main__.py
@@ -4,7 +4,7 @@
 
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 
 if __name__ == '__main__':
diff --git a/ptvsd/debugger.py b/ptvsd/debugger.py
index 2159715c..812756bd 100644
--- a/ptvsd/debugger.py
+++ b/ptvsd/debugger.py
@@ -10,7 +10,7 @@ import ptvsd.wrapper
 
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 DONT_DEBUG = []
 
diff --git a/ptvsd/futures.py b/ptvsd/futures.py
index 146580a0..7c47af49 100644
--- a/ptvsd/futures.py
+++ b/ptvsd/futures.py
@@ -11,7 +11,7 @@ from ptvsd.reraise import reraise
 
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 
 class Future(object):
diff --git a/ptvsd/ipcjson.py b/ptvsd/ipcjson.py
index 0f124e3d..a1d54fcd 100644
--- a/ptvsd/ipcjson.py
+++ b/ptvsd/ipcjson.py
@@ -21,7 +21,7 @@ import traceback
 
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 _TRACE = None
 
diff --git a/ptvsd/pathutils.py b/ptvsd/pathutils.py
index 27cf1409..df82c052 100644
--- a/ptvsd/pathutils.py
+++ b/ptvsd/pathutils.py
@@ -10,7 +10,7 @@ import platform
 
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 MAX_FILES_TO_CACHE = 1000
 
diff --git a/ptvsd/reraise.py b/ptvsd/reraise.py
index 22cf59a7..c139113f 100644
--- a/ptvsd/reraise.py
+++ b/ptvsd/reraise.py
@@ -14,4 +14,4 @@ else:
 
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
diff --git a/ptvsd/reraise2.py b/ptvsd/reraise2.py
index 6f78a04b..02a3ba06 100644
--- a/ptvsd/reraise2.py
+++ b/ptvsd/reraise2.py
@@ -7,7 +7,7 @@ from __future__ import print_function, with_statement, absolute_import
 
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 
 def reraise(exc_info):
diff --git a/ptvsd/reraise3.py b/ptvsd/reraise3.py
index cb428acb..b768ef9a 100644
--- a/ptvsd/reraise3.py
+++ b/ptvsd/reraise3.py
@@ -3,7 +3,7 @@
 # for license information.
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 
 def reraise(exc_info):
diff --git a/ptvsd/safe_repr.py b/ptvsd/safe_repr.py
index 42eda021..e455ce78 100644
--- a/ptvsd/safe_repr.py
+++ b/ptvsd/safe_repr.py
@@ -3,7 +3,7 @@
 # for license information.
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 import sys
 
diff --git a/ptvsd/wrapper.py b/ptvsd/wrapper.py
index 952bd306..42dda0bf 100644
--- a/ptvsd/wrapper.py
+++ b/ptvsd/wrapper.py
@@ -38,7 +38,7 @@ from ptvsd.safe_repr import SafeRepr # noqa
 
 
 __author__ = "Microsoft Corporation <ptvshelp@microsoft.com>"
-__version__ = "4.0.0a3"
+__version__ = "4.0.0a4"
 
 
 #def ipcjson_trace(s):
diff --git a/setup.py b/setup.py
index aea77ac2..a690a591 100644
--- a/setup.py
+++ b/setup.py
@@ -49,7 +49,7 @@ PACKAGE_DATA = {
 
 setup(
     name='ptvsd',
-    version='4.0.0a3',
+    version='4.0.0a4',
     description='Visual Studio remote debugging server for Python',
     license='MIT',
     author='Microsoft Corporation',