diff --git a/CHANGES.txt b/CHANGES.txt
index c0c02ad259ed..2f099a3fec5b 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,8 @@
+3.11.5.1
+ * Reject empty options and invalid DC names in replication configuration while creating or altering a keyspace (CASSANDRA-12681)
+ * Wait for schema agreement rather than in flight schema requests when bootstrapping (CASSANDRA-15158)
+ * LegacyLayout does not have same behavior as 2.x when handling unknown column names (CASSANDRA-15081)
+
 3.11.5
  * Fix SASI non-literal string comparisons (range operators) (CASSANDRA-15169)
  * Make sure user defined compaction transactions are always closed (CASSANDRA-15123)
diff --git a/build.xml b/build.xml
index 557cc076fe01..25e433d783df 100644
--- a/build.xml
+++ b/build.xml
@@ -25,7 +25,7 @@
     <property name="debuglevel" value="source,lines,vars"/>
 
     <!-- default version and SCM information -->
-    <property name="base.version" value="3.11.5"/>
+    <property name="base.version" value="3.11.5.1"/>
     <property name="scm.connection" value="scm:https://gitbox.apache.org/repos/asf/cassandra.git"/>
     <property name="scm.developerConnection" value="scm:https://gitbox.apache.org/repos/asf/cassandra.git"/>
     <property name="scm.url" value="https://gitbox.apache.org/repos/asf?p=cassandra.git;a=tree"/>
diff --git a/debian/changelog b/debian/changelog
index bf1d4d34a386..311a018689f0 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+cassandra (3.11.5.1) unstable; urgency=medium
+
+ * New release
+
+ -- Cameron Zemek <cameron@instaclustr.com> Fri, 23 Oct 2020 10:50:00 +1000
+
 cassandra (3.11.5) unstable; urgency=medium
 
   * New release