diff --git a/CHANGES.txt b/CHANGES.txt
index 88d734026a..7db0dc4111 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,5 @@
 4.0.12
+ * Update hdrhistogram to 2.1.12 (CASSANDRA-18893)
  * Improve performance of compactions when table does not have an index (CASSANDRA-18773)
  * JMH improvements - faster build and async profiler (CASSANDRA-18871)
  * Enable 3rd party JDK installations for Debian package (CASSANDRA-18844)
diff --git a/build.xml b/build.xml
index e66701a346..23fc59f947 100644
--- a/build.xml
+++ b/build.xml
@@ -537,7 +537,7 @@
             <exclusion groupId="org.checkerframework" artifactId="checker-qual" />
             <exclusion groupId="com.google.errorprone" artifactId="error_prone_annotations" />
           </dependency>
-          <dependency groupId="org.hdrhistogram" artifactId="HdrHistogram" version="2.1.9"/>
+          <dependency groupId="org.hdrhistogram" artifactId="HdrHistogram" version="2.1.12"/>
           <dependency groupId="commons-cli" artifactId="commons-cli" version="1.1"/>
           <dependency groupId="commons-codec" artifactId="commons-codec" version="1.9"/>
           <dependency groupId="commons-io" artifactId="commons-io" version="2.6" scope="test"/>