diff --git a/measureme/Cargo.toml b/measureme/Cargo.toml
index 56a7a50..a0c4bbc 100644
--- a/measureme/Cargo.toml
+++ b/measureme/Cargo.toml
@@ -10,6 +10,6 @@ license = "MIT OR Apache-2.0"
 travis-ci = { repository = "rust-lang/measureme" }
 
 [dependencies]
-byteorder = "1.3"
+byteorder = "1.2.7"
 rustc-hash = "1.0.1"
-memmap = "0.7.0"
+memmap = "0.6.0"