diff --git a/Cargo.toml b/Cargo.toml
index 3d905b5..c1286a9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,4 +22,4 @@ num-derive = "0.3"
 err-derive = "0.3"
 
 [dev-dependencies]
-pretty_assertions = "0.6.1"
+pretty_assertions = "1.3.0"