diff --git a/build.gradle b/build.gradle
index 56e3823..d14e80d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -32,7 +32,7 @@ dependencies {
     implementation 'org.slf4j:slf4j-api:2.0.9'
     implementation 'org.apache.logging.log4j:log4j-api:2.21.0'
     implementation 'org.apache.logging.log4j:log4j-core:2.21.0'
-    implementation 'org.apache.logging.log4j:log4j-slf4j2-impl:2.20.0'
+    implementation 'org.apache.logging.log4j:log4j-slf4j2-impl:2.21.0'
 
     // for input generation
     implementation 'com.github.curious-odd-man:rgxgen:1.4'