diff --git a/VERSION b/VERSION
index 0062ac971..64f89ffad 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.0.0
+5.1.0b5
diff --git a/stripe/version.py b/stripe/version.py
index eb5be06b6..6c6cac165 100644
--- a/stripe/version.py
+++ b/stripe/version.py
@@ -1 +1 @@
-VERSION = "5.0.0"
+VERSION = "5.1.0b5"