diff --git a/lucene/CHANGES.txt b/lucene/CHANGES.txt
index 231428ddebb..26606dea704 100644
--- a/lucene/CHANGES.txt
+++ b/lucene/CHANGES.txt
@@ -920,6 +920,9 @@ Other
   that are trivially replaced by LeafReader.terms() and MultiFields.getTerms()
   (David Smiley)
 
+======================= Lucene 6.6.4 =======================
+(No Changes)
+
 ======================= Lucene 6.6.3 =======================
 
 Build
diff --git a/solr/CHANGES.txt b/solr/CHANGES.txt
index e5836e46ce7..980d20bab08 100644
--- a/solr/CHANGES.txt
+++ b/solr/CHANGES.txt
@@ -2053,6 +2053,25 @@ Other Changes
 
 * SOLR-11324: Clean up mention of trie fields in documentation and source comments. (Steve Rowe)
 
+==================  6.6.4 ==================
+
+Consult the LUCENE_CHANGES.txt file for additional, low level, changes in this release.
+
+Versions of Major Components
+---------------------
+Apache Tika 1.17
+Carrot2 3.15.0
+Velocity 1.7 and Velocity Tools 2.0
+Apache UIMA 2.3.1
+Apache ZooKeeper 3.4.11
+Jetty 9.4.10.v20180503
+
+Bug Fixes
+----------------------
+
+* SOLR-12316: Do not allow to use absolute URIs for including other files in solrconfig.xml and schema parsing.
+  (Ananthesh, Ishan Chattopadhyaya, Uwe Schindler)
+
 ==================  6.6.3 ==================
 
 Consult the LUCENE_CHANGES.txt file for additional, low level, changes in this release.