diff --git a/Cargo.lock b/Cargo.lock
index e6d80aa..b07bc26 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1219,11 +1219,6 @@ name = "quick-error"
 version = "1.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "quote"
-version = "0.3.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "quote"
 version = "0.4.2"
@@ -2310,7 +2305,6 @@ dependencies = [
 "checksum protobuf-codegen 2.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7dc1ef231350d13cb261717a1223ac43c1e93c9b3180535920c1a9cc51f80567"
 "checksum protobuf-codegen-pure 2.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "48b7a5dbe7e07265974a3897320af02372c63562ecf6514a0f0bce50812003bb"
 "checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
-"checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
 "checksum quote 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1eca14c727ad12702eb4b6bfb5a232287dcf8385cb8ca83a3eeaf6519c44c408"
 "checksum quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)" = "cdd8e04bd9c52e0342b406469d494fcb033be4bdbe5c606016defbb1681411e1"
 "checksum rand 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)" = "64ac302d8f83c0c1974bf758f6b041c6c8ada916fbb44a609158ca8b064cc76c"