diff --git a/setup.py b/setup.py
index d605d37e..5d876360 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="deepdrr",
-    version="1.1.0a3",
+    version="1.1.0a4",
     author="Benjamin D. Killeen",
     author_email="killeen@jhu.edu",
     description="A Catalyst for Machine Learning in Fluoroscopy-guided Procedures.",