diff --git a/src/pymatching/_version.py b/src/pymatching/_version.py
index 45459061..c320ca13 100644
--- a/src/pymatching/_version.py
+++ b/src/pymatching/_version.py
@@ -1 +1 @@
-__version__ = "2.2.dev1"    # pragma no cover
+__version__ = "2.2.1"    # pragma no cover