diff --git a/slog-error-chain-derive/Cargo.lock b/slog-error-chain-derive/Cargo.lock
index cb44496..a533b3c 100644
--- a/slog-error-chain-derive/Cargo.lock
+++ b/slog-error-chain-derive/Cargo.lock
@@ -1,12 +1,12 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.70"
+version = "1.0.105"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39278fbbf5fb4f646ce651690877f89d1c5811a3d4acb27700c1cb3cdb78fd3b"
+checksum = "535d180e0ecab6268a3e718bb9fd44db66bbbc256257165fc699dadf70d16fe7"
 dependencies = [
  "unicode-ident",
 ]