diff --git a/project/build-build.sbt b/project/build-build.sbt
index e69fd91..8e5a8c9 100644
--- a/project/build-build.sbt
+++ b/project/build-build.sbt
@@ -1,5 +1,5 @@
 libraryDependencies += "com.lihaoyi"                   %% "os-lib"               % "0.10.3"
-libraryDependencies += "com.lihaoyi"                   %% "ujson"                % "3.3.1"
+libraryDependencies += "com.lihaoyi"                   %% "ujson"                % "4.0.0"
 libraryDependencies += "com.lihaoyi"                   %% "pprint"               % "0.9.0"
 libraryDependencies += "io.github.nafg.scalac-options" %% "scalac-options"       % "0.3.0"
 libraryDependencies += "io.circe"                      %% "circe-generic-extras" % "0.14.3"