diff --git a/examples/grails3-hibernate5-mongodb/build.gradle b/examples/grails3-hibernate5-mongodb/build.gradle
index 9f59f2bf..bd84ba9a 100644
--- a/examples/grails3-hibernate5-mongodb/build.gradle
+++ b/examples/grails3-hibernate5-mongodb/build.gradle
@@ -25,7 +25,7 @@ dependencies {
     testImplementation "org.grails:grails-gorm-testing-support:$testingSupportVersion"
     testImplementation "org.grails:grails-web-testing-support:$testingSupportVersion"
     testImplementation "de.bwaldvogel:mongo-java-server:$mongoJavaServerVersion"
-    testImplementation "io.netty:netty-transport:4.1.66.Final"
+    testImplementation "io.netty:netty-transport:4.1.67.Final"
     testImplementation "io.netty:netty-codec:4.1.66.Final"
     testImplementation "io.netty:netty-handler:4.1.66.Final"
     testImplementation "org.grails.plugins:geb", {
diff --git a/examples/grails3-mongodb/build.gradle b/examples/grails3-mongodb/build.gradle
index 8631d2fd..7b8cb213 100644
--- a/examples/grails3-mongodb/build.gradle
+++ b/examples/grails3-mongodb/build.gradle
@@ -22,7 +22,7 @@ dependencies {
     testImplementation "org.grails:grails-gorm-testing-support:$testingSupportVersion"
     testImplementation "org.grails:grails-web-testing-support:$testingSupportVersion"
     testImplementation "de.bwaldvogel:mongo-java-server:$mongoJavaServerVersion"
-    testImplementation "io.netty:netty-transport:4.1.66.Final"
+    testImplementation "io.netty:netty-transport:4.1.67.Final"
     testImplementation "io.netty:netty-codec:4.1.66.Final"
     testImplementation "io.netty:netty-handler:4.1.66.Final"