diff --git a/Cargo.toml b/Cargo.toml
index b0475198..8e34595a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 
 name = "url"
-version = "0.5.3"
+version = "0.5.4"
 authors = [ "Simon Sapin <simon.sapin@exyr.org>" ]
 
 description = "URL library for Rust, based on the WHATWG URL Standard"
@@ -17,7 +17,7 @@ serde_serialization = ["serde"]
 heap_size = ["heapsize", "heapsize_plugin"]
 
 [dependencies.heapsize]
-version = "0.1.1"
+version = ">=0.1.1, <0.3"
 optional = true
 
 [dependencies.heapsize_plugin]