diff --git a/project/OmnidocBuild.scala b/project/OmnidocBuild.scala
index 64b7517..aeb6a1b 100644
--- a/project/OmnidocBuild.scala
+++ b/project/OmnidocBuild.scala
@@ -20,7 +20,7 @@ object OmnidocBuild {
 
   val playVersion              = sys.props.getOrElse("play.version",               "2.9.3")
   val scalaTestPlusPlayVersion = sys.props.getOrElse("scalatestplus-play.version", "6.0.1")
-  val playJsonVersion          = sys.props.getOrElse("play-json.version",          "2.10.5")
+  val playJsonVersion          = sys.props.getOrElse("play-json.version",          "3.0.3")
   val playSlickVersion         = sys.props.getOrElse("play-slick.version",         "5.3.0")
   val maybeTwirlVersion        = sys.props.get("twirl.version")