diff --git a/binary-parser.cabal b/binary-parser.cabal
--- a/binary-parser.cabal
+++ b/binary-parser.cabal
@@ -1,7 +1,7 @@
 name:
   binary-parser
 version:
-  0.5.0.1
+  0.5.1
 synopsis:
   A highly-efficient but limited parser API specialised for bytestrings
 category:
@@ -50,6 +50,6 @@
     bytestring >= 0.10 && < 0.11,
     text >= 1 && < 2,
     -- general:
-    transformers >= 0.3 && < 0.5,
+    transformers >= 0.3 && < 0.6,
     base-prelude >= 0.1.19 && < 0.2