diff --git a/rsa/__init__.py b/rsa/__init__.py
index 1567dc1..0a77e35 100644
--- a/rsa/__init__.py
+++ b/rsa/__init__.py
@@ -27,7 +27,7 @@
 
 __author__ = "Sybren Stuvel, Barry Mead and Yesudeep Mangalapilly"
 __date__ = '2020-06-12'
-__version__ = '4.6'
+__version__ = '4.7-dev0'
 
 # Do doctest if we're run directly
 if __name__ == "__main__":
diff --git a/setup.py b/setup.py
index 2d22865..bdc552a 100755
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
 
 if __name__ == '__main__':
     setup(name='rsa',
-          version='4.6',
+          version='4.7-dev0',
           description='Pure-Python RSA implementation',
           long_description=long_description,
           long_description_content_type='text/markdown',