diff --git a/CHANGES.txt b/CHANGES.txt
index 29723d46b5..75c3f73183 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,5 @@
 3.11.10
+ * Update jflex-1.6.0.jar to match upstream (CASSANDRA-16393)
  * Fix DecimalDeserializer#toString OOM (CASSANDRA-14925)
  * Rate limit validation compactions using compaction_throughput_mb_per_sec (CASSANDRA-16161)
  * SASI's `max_compaction_flush_memory_in_mb` settings over 100GB revert to default of 1GB (CASSANDRA-16071)
diff --git a/lib/jflex-1.6.0.jar b/lib/jflex-1.6.0.jar
index 550e446cdd..b22895c654 100644
Binary files a/lib/jflex-1.6.0.jar and b/lib/jflex-1.6.0.jar differ