diff --git a/example/example-client/build.gradle b/example/example-client/build.gradle
index 2003b04..d78b686 100644
--- a/example/example-client/build.gradle
+++ b/example/example-client/build.gradle
@@ -16,7 +16,7 @@ dependencies {
     implementation 'com.jacobmountain:graphql-java-client-spring-web:+'
 
     implementation 'org.springframework.boot:spring-boot-starter-webflux'
-    implementation group: 'io.projectreactor', name: 'reactor-core', version: '3.4.3'
+    implementation group: 'io.projectreactor', name: 'reactor-core', version: '3.5.3'
     implementation 'org.java-websocket:Java-WebSocket:1.5.1'
 
     compileOnly 'org.projectlombok:lombok:1.18.18'
diff --git a/example/example-server/build.gradle b/example/example-server/build.gradle
index e713531..bd74cea 100644
--- a/example/example-server/build.gradle
+++ b/example/example-server/build.gradle
@@ -5,7 +5,7 @@ plugins {
 dependencies {
     implementation 'io.leangen.graphql:spqr:0.11.1'
     implementation 'com.graphql-java-kickstart:graphql-spring-boot-starter:11.0.0'
-    implementation group: 'io.projectreactor', name: 'reactor-core', version: '3.4.3'
+    implementation group: 'io.projectreactor', name: 'reactor-core', version: '3.5.3'
 
     compileOnly 'org.projectlombok:lombok:1.18.18'
     annotationProcessor 'org.projectlombok:lombok:1.18.18'
diff --git a/graphql-java-client-processor/build.gradle b/graphql-java-client-processor/build.gradle
index 46aa1b4..8d884e0 100644
--- a/graphql-java-client-processor/build.gradle
+++ b/graphql-java-client-processor/build.gradle
@@ -16,7 +16,7 @@ dependencies {
     implementation "com.graphql-java:graphql-java:16.2"
 
     implementation group: "com.fasterxml.jackson.core", name: "jackson-annotations", version: "2.12.2"
-    implementation group: "io.projectreactor", name: "reactor-core", version: "3.4.3"
+    implementation group: "io.projectreactor", name: "reactor-core", version: "3.5.3"
 
     // annotation processing
     annotationProcessor "com.google.auto.service:auto-service:1.0-rc7"