diff --git a/tests-extra/Cargo.lock b/tests-extra/Cargo.lock
index 565989a..65b4c62 100644
--- a/tests-extra/Cargo.lock
+++ b/tests-extra/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -72,25 +74,25 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.59"
+version = "1.0.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6aeca18b86b413c660b781aa319e4e2648a3e6f9eadc9b47e9038e6fe9f3451b"
+checksum = "0a2ca2c61bc9f3d74d2886294ab7b9853abd9c1ad903a3ac7815c58989bb7bab"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.28"
+version = "1.0.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b9ab9c7eadfd8df19006f1cf1a4aed13540ed5cbc047010ece5826e10825488"
+checksum = "8856d8364d252a14d474036ea1358d63c9e6965c8e5c1885c18f73d70bff9c7b"
 dependencies = [
  "proc-macro2",
 ]
 
 [[package]]
 name = "self_cell"
-version = "0.10.2"
+version = "1.0.1"
 
 [[package]]
 name = "serde"
@@ -126,9 +128,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.109"
+version = "1.0.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -150,6 +152,7 @@ version = "0.1.0"
 dependencies = [
  "crossbeam-utils",
  "impls",
+ "proc-macro2",
  "self_cell",
  "serde",
  "serde_json",
diff --git a/tests-extra/Cargo.toml b/tests-extra/Cargo.toml
index 0b7023d..5619a48 100644
--- a/tests-extra/Cargo.toml
+++ b/tests-extra/Cargo.toml
@@ -14,3 +14,4 @@ trybuild = "=1.0.37"
 # Pin specific versions to ensure transitive dependencies.
 serde_json = "=1.0.6"
 serde = "=1.0.103"
+proc-macro2 = "=1.0.43"