diff --git a/Cargo.lock b/Cargo.lock
index b8643c83309c9..3b8bac37e1a87 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2909,9 +2909,9 @@ checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.30"
+version = "1.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "edc3358ebc67bc8b7fa0c007f945b0b18226f78437d61bec735a9eb96b61ee70"
+checksum = "ec757218438d5fda206afc041538b2f6d889286160d649a86a24d37e1235afd1"
 dependencies = [
  "unicode-xid",
 ]
@@ -2979,9 +2979,9 @@ checksum = "07589615d719a60c8dd8a4622e7946465dfef20d1a428f969e3443e7386d5f45"
 
 [[package]]
 name = "quote"
-version = "1.0.7"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+checksum = "a1feb54ed693b93a84e14094943b84b7c4eae204c512b7ccb95ab0c66d278ad1"
 dependencies = [
  "proc-macro2",
 ]
@@ -5018,9 +5018,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.80"
+version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d010a1623fbd906d51d650a9916aaefc05ffa0e4053ff7fe601167f3e715d194"
+checksum = "b683b2b825c8eef438b77c36a06dc262294da3d5a5813fac20da149241dcd44d"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 3f776b70b14c7..4bf932563aadc 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -177,7 +177,6 @@ const PERMITTED_DEPENDENCIES: &[&str] = &[
     "rand_chacha",
     "rand_core",
     "rand_hc",
-    "rand_pcg",
     "rand_xorshift",
     "rand_xoshiro",
     "redox_syscall",