diff --git a/build.sbt b/build.sbt
index 396cf848..2727519c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -18,7 +18,7 @@ inThisBuild(
   )
 )
 
-val http4sVersion = "1.0.0-M41"
+val http4sVersion = "1.0.0-M42"
 
 val jetty = "12.0.7"