diff --git a/lucene/backward-codecs/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java b/lucene/backward-codecs/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java
index 0e1e5a096bf..633c916e453 100644
--- a/lucene/backward-codecs/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java
+++ b/lucene/backward-codecs/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java
@@ -324,7 +324,9 @@ public class TestBackwardsCompatibility extends LuceneTestCase {
     "8.3.0-cfs",
     "8.3.0-nocfs",
     "8.3.1-cfs",
-    "8.3.1-nocfs"
+    "8.3.1-nocfs",
+    "8.4.0-cfs",
+    "8.4.0-nocfs"
   };
 
   public static String[] getOldNames() {
@@ -350,7 +352,8 @@ public class TestBackwardsCompatibility extends LuceneTestCase {
     "sorted.8.1.1",
     "sorted.8.2.0",
     "sorted.8.3.0",
-    "sorted.8.3.1"
+    "sorted.8.3.1",
+    "sorted.8.4.0"
   };
 
   public static String[] getOldSortedNames() {
diff --git a/lucene/backward-codecs/src/test/org/apache/lucene/index/index.8.4.0-cfs.zip b/lucene/backward-codecs/src/test/org/apache/lucene/index/index.8.4.0-cfs.zip
new file mode 100644
index 00000000000..928938e3535
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diff --git a/lucene/backward-codecs/src/test/org/apache/lucene/index/index.8.4.0-nocfs.zip b/lucene/backward-codecs/src/test/org/apache/lucene/index/index.8.4.0-nocfs.zip
new file mode 100644
index 00000000000..b974cda9886
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diff --git a/lucene/backward-codecs/src/test/org/apache/lucene/index/sorted.8.4.0.zip b/lucene/backward-codecs/src/test/org/apache/lucene/index/sorted.8.4.0.zip
new file mode 100644
index 00000000000..b3f23c9c28e
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