diff --git a/pyhanko/version.py b/pyhanko/version.py
index 441b9514..1a4f5f45 100644
--- a/pyhanko/version.py
+++ b/pyhanko/version.py
@@ -1,2 +1,2 @@
-__version__ = '0.21.0'
-__version_info__ = (0, 21, 0)
+__version__ = '0.21.1-dev1'
+__version_info__ = (0, 21, 1, 'dev1')