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 e80bf9beabb..8e24ea81163 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
@@ -298,7 +298,9 @@ public class TestBackwardsCompatibility extends LuceneTestCase {
     "7.2.1-cfs",
     "7.2.1-nocfs",
     "7.3.0-cfs",
-    "7.3.0-nocfs"
+    "7.3.0-nocfs",
+    "7.3.1-cfs",
+    "7.3.1-nocfs"
   };
 
   public static String[] getOldNames() {
@@ -311,7 +313,8 @@ public class TestBackwardsCompatibility extends LuceneTestCase {
     "sorted.7.1.0",
     "sorted.7.2.0",
     "sorted.7.2.1",
-    "sorted.7.3.0"
+    "sorted.7.3.0",
+    "sorted.7.3.1"
   };
 
   public static String[] getOldSortedNames() {
diff --git a/lucene/backward-codecs/src/test/org/apache/lucene/index/index.7.3.1-cfs.zip b/lucene/backward-codecs/src/test/org/apache/lucene/index/index.7.3.1-cfs.zip
new file mode 100644
index 00000000000..4f940eaa640
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diff --git a/lucene/backward-codecs/src/test/org/apache/lucene/index/index.7.3.1-nocfs.zip b/lucene/backward-codecs/src/test/org/apache/lucene/index/index.7.3.1-nocfs.zip
new file mode 100644
index 00000000000..f3014dc5cd5
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diff --git a/lucene/backward-codecs/src/test/org/apache/lucene/index/sorted.7.3.1.zip b/lucene/backward-codecs/src/test/org/apache/lucene/index/sorted.7.3.1.zip
new file mode 100644
index 00000000000..f81579fdb6a
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