diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff35eb4a..2e90dfe7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,4 @@
+# 0.3.1.2341-12.os (2021-08-17)
 - Fixed ``error creating OS-X MIDI client object`` error messages on OSx
 # 0.3.1.2341-11.os (2021-08-16)
 - Switched to releases of RtAudio 5.1.0 and RtMidi 4.0.0