diff --git a/build.sc b/build.sc
index dcec89b..148ee7b 100644
--- a/build.sc
+++ b/build.sc
@@ -97,7 +97,7 @@ class DiagrammerModule(val crossScalaVersion: String) extends CommonModule {
   object test extends Tests {
     override def ivyDeps = Agg(
       ivy"org.scalatest::scalatest:3.1.3",
-      ivy"org.scalacheck::scalacheck:1.14.3"
+      ivy"org.scalacheck::scalacheck:1.15.4"
     )
     def testFrameworks = Seq("org.scalatest.tools.Framework")
   }