diff --git a/pipes-cereal-plus.cabal b/pipes-cereal-plus.cabal
--- a/pipes-cereal-plus.cabal
+++ b/pipes-cereal-plus.cabal
@@ -1,9 +1,9 @@
 name:
   pipes-cereal-plus
 version:
-  0.2.0
+  0.2.1
 synopsis:
-  Streaming serialization library on top of "pipes" and "cereal-plus".
+  A streaming serialization library on top of "pipes" and "cereal-plus"
 license:
   MIT
 license-file:
@@ -43,7 +43,7 @@
   build-depends:
     cereal-plus == 0.2.*,
     pipes-bytestring,
-    pipes == 4.0.*,
+    pipes >= 4.0 && < 4.2,
     errors,
     text,
     bytestring,