diff --git a/build.sbt b/build.sbt
index 6ee4081..c506f64 100644
--- a/build.sbt
+++ b/build.sbt
@@ -29,7 +29,7 @@
   "org.scalatra"             %% "scalatra-javax"               % ScalatraVersion,
   "org.scalatra"             %% "scalatra-json-javax"          % ScalatraVersion,
   "org.scalatra"             %% "scalatra-forms-javax"         % ScalatraVersion,
-  "org.json4s"               %% "json4s-jackson"               % "4.1.0-M5",
+  "org.json4s"               %% "json4s-jackson"               % "4.1.0-M6",
   "commons-io"                % "commons-io"                   % "2.16.1",
   "io.github.gitbucket"       % "solidbase"                    % "1.1.0",
   "io.github.gitbucket"       % "markedj"                      % "1.0.20",