diff --git a/build.sbt b/build.sbt
index c096573..49a71d4 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,7 +1,7 @@
 import sbtcrossproject.{ crossProject, CrossType }
 
 lazy val catsVersion       = "2.6.1"
-lazy val fs2CoreVersion    = "2.5.6"
+lazy val fs2CoreVersion    = "2.5.11"
 lazy val scalacheckVersion = "1.15.4"
 
 lazy val scala212 = "2.12.14"