diff --git a/Cargo.lock b/Cargo.lock
index 5fcea25b89a..0772dc60c81 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3253,7 +3253,6 @@ dependencies = [
 name = "rustc-workspace-hack"
 version = "1.0.0"
 dependencies = [
- "byteorder",
  "crossbeam-utils 0.6.5",
  "serde",
  "serde_json",
diff --git a/src/librustc/Cargo.toml b/src/librustc/Cargo.toml
index d569573a5e9..0834faf1324 100644
--- a/src/librustc/Cargo.toml
+++ b/src/librustc/Cargo.toml
@@ -31,7 +31,7 @@ syntax = { path = "../libsyntax" }
 syntax_pos = { path = "../libsyntax_pos" }
 backtrace = "0.3.3"
 parking_lot = "0.9"
-byteorder = { version = "1.1", features = ["i128"]}
+byteorder = { version = "1.3" }
 chalk-engine = { version = "0.9.0", default-features=false }
 rustc_fs_util = { path = "../librustc_fs_util" }
 smallvec = { version = "0.6.7", features = ["union", "may_dangle"] }
diff --git a/src/librustc_mir/Cargo.toml b/src/librustc_mir/Cargo.toml
index e02736078b5..0691390bead 100644
--- a/src/librustc_mir/Cargo.toml
+++ b/src/librustc_mir/Cargo.toml
@@ -24,6 +24,6 @@ rustc_lexer = { path = "../librustc_lexer" }
 rustc_serialize = { path = "../libserialize", package = "serialize" }
 syntax = { path = "../libsyntax" }
 syntax_pos = { path = "../libsyntax_pos" }
-byteorder = { version = "1.1", features = ["i128"] }
+byteorder = { version = "1.3" }
 rustc_apfloat = { path = "../librustc_apfloat" }
 smallvec = { version = "0.6.7", features = ["union", "may_dangle"] }
diff --git a/src/tools/rustc-workspace-hack/Cargo.toml b/src/tools/rustc-workspace-hack/Cargo.toml
index d068e1cf307..930279c0ca2 100644
--- a/src/tools/rustc-workspace-hack/Cargo.toml
+++ b/src/tools/rustc-workspace-hack/Cargo.toml
@@ -62,7 +62,6 @@ crossbeam-utils = { version = "0.6.5", features = ["nightly"] }
 serde = { version = "1.0.82", features = ['derive'] }
 serde_json = { version = "1.0.31", features = ["raw_value"] }
 smallvec = { version = "0.6", features = ['union', 'may_dangle'] }
-byteorder = { version = "1.2.7", features = ["i128"] }
 
 
 [target.'cfg(not(windows))'.dependencies]