diff --git a/src/test/regress/citus_tests/common.py b/src/test/regress/citus_tests/common.py
index 00398767e..0620eef23 100644
--- a/src/test/regress/citus_tests/common.py
+++ b/src/test/regress/citus_tests/common.py
@@ -94,6 +94,7 @@ OLDEST_SUPPORTED_CITUS_VERSION_MATRIX = {
     15: "11.1.5",
     16: "12.1.5",
     17: "13.0.1",
+    18: "13.1.0",
 }
 
 OLDEST_SUPPORTED_CITUS_VERSION = OLDEST_SUPPORTED_CITUS_VERSION_MATRIX[PG_MAJOR_VERSION]