diff --git a/slf4j/build.gradle b/slf4j/build.gradle
index 4f86e1a..df78ac0 100644
--- a/slf4j/build.gradle
+++ b/slf4j/build.gradle
@@ -10,7 +10,7 @@ dependencies {
     implementation group: 'org.slf4j', name: 'slf4j-api', version: '1.7.30'
 
     // logback classic is used to capture events in tests
-    testImplementation group: 'ch.qos.logback', name: 'logback-classic', version: '1.2.3'
+    testImplementation group: 'ch.qos.logback', name: 'logback-classic', version: '1.5.20'
 
 
     testImplementation(libs.junit)