diff --git a/Cargo.lock b/Cargo.lock
index db2e9d983ef..d37c641b6aa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -321,7 +321,7 @@ dependencies = [
  "time 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "traitobject 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "typeable 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicase 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicase 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 0.2.38 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -341,7 +341,7 @@ dependencies = [
  "time 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "traitobject 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "typeable 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicase 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicase 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -784,7 +784,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "unicase"
-version = "1.3.0"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",