diff --git a/build.sbt b/build.sbt
index ffe7ea0..96c9034 100644
--- a/build.sbt
+++ b/build.sbt
@@ -15,7 +15,7 @@ val fezziwigVersion = "2.0.0"
 // dependency versions (for tests only)
 val scalaTestVersion = "3.0.8"
 val guavaVersion = "19.0"
-val diffsonVersion = "4.1.1"
+val diffsonVersion = "4.6.1"
 
 // support non-production release types
 val betaReleaseType = "beta"