diff --git a/Cargo.toml b/Cargo.toml
index 29d0d04..a64dac8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -58,7 +58,7 @@ chrono = { version = "0.4.31", optional = true, default-features = false, featur
 ] }
 chrono-tz = { version = ">=0.6, <0.11.0", optional = true }
 chronoutil = { version = "0.2", optional = true }
-duration-str = { version = ">=0.11, <0.16", optional = true, default-features = false }
+duration-str = { version = ">=0.11, <0.17", optional = true, default-features = false }
 
 [dev-dependencies.tokio]
 version = "1.5"