diff --git a/cagra/Cargo.toml b/cagra/Cargo.toml
index 9f5c89a..cd1869f 100644
--- a/cagra/Cargo.toml
+++ b/cagra/Cargo.toml
@@ -17,7 +17,7 @@ failure = "0.1"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"
-cauchy = "0.3"
+cauchy = "0.4"
 
 [dependencies.petgraph]
 version = "0.4"