diff --git a/Cargo.toml b/Cargo.toml
index 6807dec..77d8f87 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,5 +22,5 @@ include = [
 [dev-dependencies]
 lazy_static = "1"
 maplit = "1"
-pretty_assertions = "0.5"
+pretty_assertions = "0.6"
 rand = "0.4"