diff --git a/Cargo.toml b/Cargo.toml
index 48afdb6d..64504e7a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ optional = true
 optional = true
 
 [dependencies.heapsize]
-version = "0.1.1"
+version = ">=0.1.1, <0.3.0"
 optional = true
 
 [dependencies.heapsize_plugin]