diff --git a/build.sbt b/build.sbt
index f6bf78d8..3102e6b0 100644
--- a/build.sbt
+++ b/build.sbt
@@ -17,8 +17,8 @@ lazy val core = project
       "io.higherkindness"          %% "skeuomorph"          % "0.0.23",
       "com.julianpeeters"          %% "avrohugger-core"     % "1.0.0-RC22",
       "io.circe"                   %% "circe-generic"       % "0.13.0",
-      "org.http4s"                 %% "http4s-blaze-client" % "0.21.4",
-      "org.http4s"                 %% "http4s-circe"        % "0.21.4",
+      "org.http4s"                 %% "http4s-blaze-client" % "0.21.6",
+      "org.http4s"                 %% "http4s-circe"        % "0.21.6",
       "org.scalatest"              %% "scalatest"           % "3.2.0"   % Test,
       "org.scalacheck"             %% "scalacheck"          % "1.14.3"  % Test,
       "org.scalatestplus"          %% "scalacheck-1-14"     % "3.2.0.0" % Test,