diff --git a/DESCRIPTION b/DESCRIPTION
index 6f2eea08..56586f83 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Type: Package
 Package: nflfastR
 Title: Functions to Efficiently Access NFL Play by Play Data
-Version: 4.6.0
+Version: 4.6.0.9000
 Authors@R: 
     c(person(given = "Sebastian",
              family = "Carl",
diff --git a/NEWS.md b/NEWS.md
index f760425b..31bf104d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,7 @@
+# nflfastR (development version)
+
+- The function `calculate_series_conversion_rates()` now correctly aggregates season level conversion rates. Performance has also been improved. (#440)
+
 # nflfastR 4.6.0
 
 ## New Features