diff --git a/build.gradle b/build.gradle
index 478f9c3..6c05d2e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -25,7 +25,7 @@ repositories {
 //    mavenLocal()
 }
 
-final String headlongVersion = '12.2.0'
+final String headlongVersion = '12.1.0'
 final String junitVersion = '5.10.3'
 final DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("MMMM d yyyy", Locale.ENGLISH).withZone(ZoneId.of("UTC"))