diff --git a/Cargo.toml b/Cargo.toml
index b9f9e9d..d414084 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,4 +26,4 @@ byteorder = "~1.4.3"
 [dev-dependencies]
 # Pretty Assertions should not be over 1.3.0 as its MSRV is 1.54.0.
 # Yes, It's pretty old. But this libary follows byteorder's MSRV only. (Rust 1.14.1 - Released on Feb 27, 2020) 
-pretty_assertions = "~1.2.1"
\ No newline at end of file
+pretty_assertions = "~1.4.0"
\ No newline at end of file