diff --git a/protolude.cabal b/protolude.cabal
index a1fb5e725..66853bcfb 100644
--- a/protolude.cabal
+++ b/protolude.cabal
@@ -77,7 +77,7 @@ library
     bytestring          >= 0.10 && <0.11,
     mtl                 >= 2.1  && <2.3,
     mtl-compat          >= 0.2  && <0.3,
-    transformers-compat >= 0.4  && <0.6
+    transformers-compat >= 0.4  && <0.7
 
   if impl(ghc >= 7.8.0)
     build-depends: