diff --git a/Cargo.toml b/Cargo.toml
index a4b235e..250deaa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,7 +35,7 @@ serde_derive = { version = "1", optional = true }
 simba = { version = "0.1.2", optional = true }
 
 [dev-dependencies]
-float-cmp = "0.6"
+float-cmp = ">=0.6, < 0.9"
 serde_json = "1"
 
 [package.metadata.docs.rs]