diff --git a/ChangeLog.md b/ChangeLog.md
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--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,4 +1,4 @@
-# 12.1.0 - TBD
+# 12.1.0 - 2025-10-29
 
 - Optimized `buffer::append`, resulting in up to ~16% improvement on spdlog
   benchmarks (https://github.com/fmtlib/fmt/pull/4541). Thanks @fyrsta7.