diff --git a/NEWS b/NEWS
index 5ca8fa9fe..0356b7e6d 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,7 @@
-1.5.21.dev0
+1.5.21
  * #28: Optionally retry failing backups via "retries" and "retry_wait" configuration options.
+ * #306: Add "list_options" MySQL configuration option for passing additional arguments to MySQL
+   list command.
  * #459: Add support for old version (2.x) of jsonschema library.
 
 1.5.20
diff --git a/borgmatic/config/validate.py b/borgmatic/config/validate.py
index 7d411516f..bf3aceddd 100644
--- a/borgmatic/config/validate.py
+++ b/borgmatic/config/validate.py
@@ -112,7 +112,7 @@ def parse_configuration(config_filename, schema_filename, overrides=None):
 
     try:
         validator = jsonschema.Draft7Validator(schema)
-    except AttributeError:
+    except AttributeError:  # pragma: no cover
         validator = jsonschema.Draft4Validator(schema)
     validation_errors = tuple(validator.iter_errors(config))
 
diff --git a/setup.py b/setup.py
index 11a83f15b..171c358bf 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from setuptools import find_packages, setup
 
-VERSION = '1.5.21.dev0'
+VERSION = '1.5.21'
 
 
 setup(