diff --git a/py/fastspecfit/_version.py b/py/fastspecfit/_version.py
index dc0a25b7..8c678b1f 100644
--- a/py/fastspecfit/_version.py
+++ b/py/fastspecfit/_version.py
@@ -1 +1 @@
-__version__ = '3.1.3'
+__version__ = '3.1.3.dev2040'