diff --git a/logstash-core/build.gradle b/logstash-core/build.gradle
index 9dc373b17..4083bb962 100644
--- a/logstash-core/build.gradle
+++ b/logstash-core/build.gradle
@@ -30,7 +30,7 @@ String jrubyVersion = versionMap['jruby']['version']
 String jacksonVersion = versionMap['jackson']
 String jacksonDatabindVersion = versionMap['jackson-databind']
 
-String log4jVersion = '2.13.3'
+String log4jVersion = '2.14.0'
 
 repositories {
     mavenCentral()
@@ -164,6 +164,8 @@ dependencies {
     runtimeOnly "org.apache.logging.log4j:log4j-jcl:${log4jVersion}"
     // for the log4j-jcl bridge to work commons-logging needs to be on the same class-path
     runtimeOnly 'commons-logging:commons-logging:1.2'
+    // also handle libraries relying on log4j 1.x to redirect their logs
+    runtimeOnly "org.apache.logging.log4j:log4j-1.2-api:${log4jVersion}"
     implementation('org.reflections:reflections:0.9.11') {
         exclude group: 'com.google.guava', module: 'guava'
     }