diff --git a/Cargo.lock b/Cargo.lock
index 6afdea1..77be823 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -98,9 +98,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.85"
+version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22244ce15aa966053a896d1accb3a6e68469b97c7f33f284b99f0d576879fc23"
+checksum = "307e3004becf10f5a6e0d59d20f3cd28231b0e0827a96cd3e0ce6d14bc1e4bb3"
 dependencies = [
  "unicode-ident",
 ]