diff --git a/platform/spring-boot-dependencies/build.gradle b/platform/spring-boot-dependencies/build.gradle
index 79cc4e59d3d..7eef8d54494 100644
--- a/platform/spring-boot-dependencies/build.gradle
+++ b/platform/spring-boot-dependencies/build.gradle
@@ -1124,6 +1124,10 @@ bom {
 			contains ".alpha"
 			because "we don't want alpha dependencies"
 		}
+		prohibit {
+			versionRange "[12.1.9]"
+			because "it contains a regression (https://github.com/jetty/jetty.project/issues/15021)"
+		}
 		group("org.eclipse.jetty.ee11") {
 			bom("jetty-ee11-bom")
 		}