diff --git a/CHANGES.rst b/CHANGES.rst
index 660e3d5a..712f028e 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+Version 0.1.1 [2021-01-08]
+--------------------------
+
+- [fix] Fixed ``os_identifier`` validation bug in ``Build`` model.
+
 Version 0.1.0 [2020-11-27]
 --------------------------
 
diff --git a/openwisp_firmware_upgrader/__init__.py b/openwisp_firmware_upgrader/__init__.py
index dee8d767..ebfd6f66 100644
--- a/openwisp_firmware_upgrader/__init__.py
+++ b/openwisp_firmware_upgrader/__init__.py
@@ -1,4 +1,4 @@
-VERSION = (0, 1, 0, 'final')
+VERSION = (0, 1, 1, 'final')
 __version__ = VERSION  # alias