diff --git a/adafruit_rsa/__init__.py b/adafruit_rsa/__init__.py
index d926606..a6a97d1 100755
--- a/adafruit_rsa/__init__.py
+++ b/adafruit_rsa/__init__.py
@@ -29,4 +29,4 @@
 
 __author__ = "Sybren Stuvel, Barry Mead and Yesudeep Mangalapilly"
 __date__ = "2018-09-16"
-__version__ = '4.0'
+__version__ = '4.0.0'