diff --git a/CHANGELOG.md b/CHANGELOG.md
index 196a8292b20918926df4a66fb1081651f0ede66e..a410c02f49ba921aa3b856da02f63e93915b84fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,9 @@ This is an important security update.
 
 ### Fixed
 
+* Wrong serialization of date time values in the GRPC-API (resulting in
+  org.caosdb.server.datatime@12347abcd or similar).
+
 ### Security