diff --git a/13_integrated_testing/Cargo.lock b/13_integrated_testing/Cargo.lock
index e4c51234..c0df2028 100644
--- a/13_integrated_testing/Cargo.lock
+++ b/13_integrated_testing/Cargo.lock
@@ -22,9 +22,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.18"
+version = "1.0.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "beae6331a816b1f65d04c45b078fd8e6c93e8071771f41b8163255bbd8d7c8fa"
+checksum = "51ef7cd2518ead700af67bf9d1a658d90b6037d77110fd9c0445429d0ba1c6c9"
 dependencies = [
  "unicode-xid",
 ]
@@ -55,9 +55,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.33"
+version = "1.0.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8d5d96e8cbb005d6959f119f773bfaebb5684296108fb32600c00cde305b2cd"
+checksum = "9c51d92969d209b54a98397e1b91c8ae82d8c87a7bb87df0b29aa2ad81454228"
 dependencies = [
  "proc-macro2",
  "quote",