diff --git a/bin/tag-generator.py b/bin/tag-generator.py
index c7e3cd2..c2f11d7 100755
--- a/bin/tag-generator.py
+++ b/bin/tag-generator.py
@@ -1,6 +1,6 @@
 import json
 
-DEFAULT_ALPINE_VERSION = '3.21'
+DEFAULT_ALPINE_VERSION = '3.20'
 ALPINE_VERSIONS = ['3.18', '3.19', '3.20']
 
 def generate_tags(key, version):