diff --git a/Cargo.toml b/Cargo.toml
index 70bb93d..855ba4c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,7 +44,7 @@ crate-type=["rlib", "cdylib", "staticlib"]
 [dependencies]
 cfg-if = "1.0.0"
 derive_more = { version = "0.99.17", optional = true }
-hifitime = { version = "3.8.5", default-features = false, optional = true }
+hifitime = { version = "4.0.0", default-features = false, optional = true }
 
 [features]
 default = ["std", "stdtime"]