diff --git a/build.gradle b/build.gradle
index da2543d..23b6bdd 100644
--- a/build.gradle
+++ b/build.gradle
@@ -27,7 +27,7 @@ ext {
     threetenbp_version = "1.3.5"
     json_fire_version = "1.8.0"
     slf4j_core_version = "1.6.3"
-    slf4j_classic_version = "1.2.3"
+    slf4j_classic_version = "1.6.3"
     slf4j_version = "2.0.18"
 }