diff --git a/build.gradle b/build.gradle
index e69915f..c8faddd 100644
--- a/build.gradle
+++ b/build.gradle
@@ -11,6 +11,8 @@ subprojects {
     }
     dependencies {
         implementation 'com.itextpdf:itext7-core:7.1.15'
+        implementation 'org.slf4j:slf4j-api:1.7.5'
+        implementation 'org.slf4j:slf4j-log4j12:1.7.5'
     }
 }