diff --git a/Cargo.lock b/Cargo.lock
index ad5e81dc3..546b4069c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1126,9 +1126,9 @@ checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
 [[package]]
 name = "syn"
-version = "1.0.20"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd1b5e337360b1fae433c59fcafa0c6b77c605e92540afa5221a7b81a9eca91d"
+checksum = "4696caa4048ac7ce2bcd2e484b3cef88c1004e41b8e945a277e2c25dc0b72060"
 dependencies = [
  "proc-macro2",
  "quote",