diff --git a/Cargo.lock b/Cargo.lock
index 72a25cf970347206644c77968c174ecb9ef88027..a2ff9778165f5b7506418ba446072a73ed69d92c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -423,7 +423,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -457,7 +457,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "1.0.22"
+version = "1.0.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -602,7 +602,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum sodalite 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "67643084c740297bac275b1d97901ec27ca5984be4e8f75d86a33498e0e3e61c"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum subtle 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2d67a5a62ba6e01cb2192ff309324cb4875d0c451d55fe2319433abe7a05a8ee"
-"checksum syn 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)" = "1425de3c33b0941002740a420b1a906a350b88d08b82b2c8a01035a3f9447bac"
+"checksum syn 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)" = "95b5f192649e48a5302a13f2feb224df883b98933222369e4b3b0fe2a5447269"
 "checksum termion 1.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c22cec9d8978d906be5ac94bceb5a010d885c626c4c8855721a4dbd20e3ac905"
 "checksum textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
 "checksum time 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)" = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"