Index: b/Cargo.toml
===================================================================
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -429,7 +429,7 @@
 version = "1.21"
 
 [dependencies.ordered-float]
-version = "5.0.0"
+version = "4"
 optional = true
 default-features = false
 
