diff --git a/qsimcirq/_version.py b/qsimcirq/_version.py
index 1315a776..a2c2c9c2 100644
--- a/qsimcirq/_version.py
+++ b/qsimcirq/_version.py
@@ -1,3 +1,3 @@
 """The version number defined here is read automatically in setup.py."""
 
-__version__ = "0.12.1"
+__version__ = "0.12.2.dev20220422"