diff --git a/pdelfin/version.py b/pdelfin/version.py
index 85caee7..9dd49e3 100644
--- a/pdelfin/version.py
+++ b/pdelfin/version.py
@@ -2,7 +2,7 @@ _MAJOR = "0"
 _MINOR = "1"
 # On main and in a nightly release the patch should be one ahead of the last
 # released build.
-_PATCH = "21"
+_PATCH = "22"
 # This is mainly for nightly builds which have the suffix ".dev$DATE". See
 # https://semver.org/#is-v123-a-semantic-version for the semantics.
 _SUFFIX = ""