diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
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--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,7 @@
+#### 1.5.21 April 29th 2024 ####
+
+Placeholder for nightlies
+
 #### 1.5.20 April 29th 2024 ####
 
 Akka.NET v1.5.20 is a patch release for Akka.NET with a few bug fixes and Akka.Streams quality of life improvement.