diff --git a/spring-messaging/spring-messaging.gradle b/spring-messaging/spring-messaging.gradle
index fd65d743ba6..b3f920c4a58 100644
--- a/spring-messaging/spring-messaging.gradle
+++ b/spring-messaging/spring-messaging.gradle
@@ -7,6 +7,7 @@ dependencies {
 	api(project(":spring-beans"))
 	api(project(":spring-core"))
 	compileOnly("jakarta.validation:jakarta.validation-api")
+	compileOnly("com.google.code.findbugs:jsr305") // for Reactor
 	optional(project(":spring-context"))
 	optional(project(":spring-oxm"))
 	optional("com.fasterxml.jackson.core:jackson-databind")
diff --git a/spring-web/spring-web.gradle b/spring-web/spring-web.gradle
index 6d30ead80ac..61dfa7fd56b 100644
--- a/spring-web/spring-web.gradle
+++ b/spring-web/spring-web.gradle
@@ -8,6 +8,7 @@ dependencies {
 	api(project(":spring-core"))
 	api("io.micrometer:micrometer-observation")
 	compileOnly("io.projectreactor.tools:blockhound")
+	compileOnly("com.google.code.findbugs:jsr305") // for Reactor
 	optional(project(":spring-aop"))
 	optional(project(":spring-context"))
 	optional(project(":spring-oxm"))