diff --git a/CHANGELOG.md b/CHANGELOG.md
index 16a154d..46eb4c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# v3.1.0
+
+* upd: do not force tag values to lowercase
+
 # v3.0.2
 
 * add: method to flush metrics without resetting  (`FlushMetricsNoReset()`)