diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0b51af1..0db62391 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# Version 1.9.20
+
+### Bug fixes
+- ASN.1 Bit String Null Range Handled. [US604961]
+
 # Version 1.9.10
 
 ### Bug fixes