Update README.md

rkdrudgns0412 · web-flow · commit 5189f165dd39 · 2026-03-06T21:43:03.000+09:00
diff --git a/README.md b/README.md
@@ -103,7 +103,7 @@
 
 ### Prerequisites
 
-- JDK 26
+- JDK 21
 - MariaDB (Local or Docker)
 
 ### Installation & Run
