diff --git a/appengine-java11/kotlin-ktor/pom.xml b/appengine-java11/kotlin-ktor/pom.xml
index 25bb2c622a1..2f61fec5eba 100644
--- a/appengine-java11/kotlin-ktor/pom.xml
+++ b/appengine-java11/kotlin-ktor/pom.xml
@@ -79,7 +79,7 @@ limitations under the License.
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.3.0-alpha5</version>
+      <version>1.3.0-alpha6</version>
     </dependency>
     <dependency>
       <groupId>io.ktor</groupId>
diff --git a/run/hello-broken/pom.xml b/run/hello-broken/pom.xml
index 1746e126c2a..8669adcee1d 100644
--- a/run/hello-broken/pom.xml
+++ b/run/hello-broken/pom.xml
@@ -41,7 +41,7 @@ limitations under the License.
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.3.0-alpha5</version>
+      <version>1.3.0-alpha6</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>