diff --git a/build.sbt b/build.sbt
index 60d9ad3..bfc6acf 100644
--- a/build.sbt
+++ b/build.sbt
@@ -5,7 +5,7 @@ version := "0.1"
 scalaVersion := "2.12.8"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.7" % "test"
-libraryDependencies += "org.typelevel" %% "cats-effect" % "1.3.0" withSources() withJavadoc()
+libraryDependencies += "org.typelevel" %% "cats-effect" % "1.2.0" withSources() withJavadoc()
 libraryDependencies += "com.github.scopt" %% "scopt" % "4.0.0-RC2"
 
 libraryDependencies += "co.fs2" %% "fs2-core" % "1.0.4"