diff --git a/Cargo.lock b/Cargo.lock
index 59c0594d..f963fa1a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13,9 +13,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.91"
+version = "1.0.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c042108f3ed77fd83760a5fd79b53be043192bb3b9dba91d8c574c0ada7850c8"
+checksum = "4c95c10ba0b00a02636238b814946408b1322d5ac4760326e6fb8ec956d85775"
 
 [[package]]
 name = "arrayvec"
@@ -52,9 +52,9 @@ checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
 [[package]]
 name = "bstr"
-version = "1.10.0"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "40723b8fb387abc38f4f4a37c09073622e41dd12327033091ef8950659e6dc0c"
+checksum = "1a68f1f47cdf0ec8ee4b941b2eee2a80cb796db73118c0dd09ac63fbe405be22"
 dependencies = [
  "memchr",
  "serde",
@@ -74,9 +74,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "cfgrammar"
-version = "0.13.7"
+version = "0.13.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6026d8cd82ada8bbcfe337805dd1eb6afdc9e80fa4d57e977b3a36315e0c5525"
+checksum = "6d621f687a04efa1f269f1cd13d8cfea9660852bdb3d1cd2c3c9fb6fdd34daf2"
 dependencies = [
  "indexmap",
  "lazy_static",
@@ -260,9 +260,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.15.0"
+version = "0.15.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e087f84d4f86bf4b218b927129862374b72199ae7d8657835f1e89000eea4fb"
+checksum = "bf151400ff0baff5465007dd2f3e717f3fe502074ca563069ce3a6629d07b289"
 
 [[package]]
 name = "hermit-abi"
@@ -288,9 +288,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.6.0"
+version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "707907fe3c25f5424cce2cb7e1cbcafee6bdbe735ca90ef77c29e84591e5b9da"
+checksum = "62f822373a4fe84d4bb149bf54e584a7f4abec90e072ed49cda0edea5b95471f"
 dependencies = [
  "equivalent",
  "hashbrown",
@@ -307,9 +307,9 @@ dependencies = [
 
 [[package]]
 name = "itoa"
-version = "1.0.11"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
+checksum = "d75a2a4b1b190afb6f5425f10f6a8f959d2ea0b9c2b1d79553551850539e4674"
 
 [[package]]
 name = "lang_tester"
@@ -335,9 +335,9 @@ checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
 
 [[package]]
 name = "libc"
-version = "0.2.161"
+version = "0.2.167"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e9489c2807c139ffd9c1794f4af0ebe86a828db53ecdc7fea2111d0fed085d1"
+checksum = "09d6582e104315a817dff97f75133544b2e094ee22447d2acf4a74e189ba06fc"
 
 [[package]]
 name = "libredox"
@@ -379,9 +379,9 @@ checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
 [[package]]
 name = "lrlex"
-version = "0.13.7"
+version = "0.13.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "05863fdac293d1bc74f0cd91512933a5ab67e0cb607dc78ac4984be089456b49"
+checksum = "6fe1e8741f737ba4b6d781f716051df6375ff0488d57ee23822a2cdba1c3dc7a"
 dependencies = [
  "cfgrammar",
  "getopts",
@@ -397,9 +397,9 @@ dependencies = [
 
 [[package]]
 name = "lrpar"
-version = "0.13.7"
+version = "0.13.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b1ecae55cf667db308d3555e22b20bcc28eaeca0c95a09b37171673be157c71"
+checksum = "19c61bcff4c1dd2deb9567ea868237828a8cd179c3f64106f6726656e372421d"
 dependencies = [
  "bincode",
  "cactus",
@@ -419,9 +419,9 @@ dependencies = [
 
 [[package]]
 name = "lrtable"
-version = "0.13.7"
+version = "0.13.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d42d2752cb50a171efadda0cb6fa97432e8bf05accfff3eed320b87e80a2f69e"
+checksum = "49e35162de3a5d91b380f8ebb31fc6c5e9a4618276465df4725ff1f88613312b"
 dependencies = [
  "cfgrammar",
  "fnv",
@@ -440,7 +440,7 @@ checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 [[package]]
 name = "natrob"
 version = "0.1.0"
-source = "git+https://github.com/softdevteam/natrob#948d547f5f22f423d32eef14ed36cfbf27938aaa"
+source = "git+https://github.com/softdevteam/natrob#512e9a098cd38e62b7b7bc0f760b13515604e0d2"
 dependencies = [
  "quote 0.6.13",
  "syn 0.15.44",
@@ -506,9 +506,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "af1844ef2428cc3e1cb900be36181049ef3d3193c63e43026cfe202983b27a56"
 dependencies = [
  "proc-macro-crate",
- "proc-macro2 1.0.89",
+ "proc-macro2 1.0.92",
  "quote 1.0.37",
- "syn 2.0.82",
+ "syn 2.0.90",
 ]
 
 [[package]]
@@ -567,9 +567,9 @@ dependencies = [
 
 [[package]]
 name = "pin-project-lite"
-version = "0.2.14"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bda66fc9667c18cb2758a2ac84d1167245054bcf85d5d1aaa6923f45801bdd02"
+checksum = "915a1e146535de9163f3987b8944ed8cf49a18bb0056bcebcdcece385cece4ff"
 
 [[package]]
 name = "pin-utils"
@@ -603,9 +603,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.89"
+version = "1.0.92"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f139b0662de085916d1fb67d2b4169d1addddda1919e696f3252b740b629986e"
+checksum = "37d3544b3f2748c54e147655edb5025752e2303145b5aefb3c3ea2c78b973bb0"
 dependencies = [
  "unicode-ident",
 ]
@@ -625,7 +625,7 @@ version = "1.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
 dependencies = [
- "proc-macro2 1.0.89",
+ "proc-macro2 1.0.92",
 ]
 
 [[package]]
@@ -654,9 +654,9 @@ checksum = "20145670ba436b55d91fc92d25e71160fbfbdd57831631c8d7d36377a476f1cb"
 
 [[package]]
 name = "regex"
-version = "1.11.0"
+version = "1.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38200e5ee88914975b69f657f0801b6f6dccafd44fd9326302a4aaeecfacb1d8"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -666,9 +666,9 @@ dependencies = [
 
 [[package]]
 name = "regex-automata"
-version = "0.4.8"
+version = "0.4.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "368758f23274712b504848e9d5a6f010445cc8b87a7cdb4d7cbee666c1288da3"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -722,9 +722,9 @@ dependencies = [
 
 [[package]]
 name = "scc"
-version = "2.2.2"
+version = "2.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2c1f7fc6deb21665a9060dfc7d271be784669295a31babdcd4dd2c79ae8cbfb"
+checksum = "66b202022bb57c049555430e11fc22fea12909276a80a4c3d368da36ac1d88ed"
 dependencies = [
  "sdd",
 ]
@@ -749,29 +749,29 @@ checksum = "61697e0a1c7e512e84a621326239844a24d8207b4669b41bc18b32ea5cbf988b"
 
 [[package]]
 name = "serde"
-version = "1.0.213"
+version = "1.0.215"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ea7893ff5e2466df8d720bb615088341b295f849602c6956047f8f80f0e9bc1"
+checksum = "6513c1ad0b11a9376da888e3e0baa0077f1aed55c17f50e7b2397136129fb88f"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.213"
+version = "1.0.215"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e85ad2009c50b58e87caa8cd6dac16bdf511bbfb7af6c33df902396aa480fa5"
+checksum = "ad1e866f866923f252f05c889987993144fb74e722403468a4ebd70c3cd756c0"
 dependencies = [
- "proc-macro2 1.0.89",
+ "proc-macro2 1.0.92",
  "quote 1.0.37",
- "syn 2.0.82",
+ "syn 2.0.90",
 ]
 
 [[package]]
 name = "serial_test"
-version = "3.1.1"
+version = "3.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b4b487fe2acf240a021cf57c6b2b4903b1e78ca0ecd862a71b71d2a51fed77d"
+checksum = "1b258109f244e1d6891bf1053a55d63a5cd4f8f4c30cf9a1280989f80e7a1fa9"
 dependencies = [
  "futures",
  "log",
@@ -783,13 +783,13 @@ dependencies = [
 
 [[package]]
 name = "serial_test_derive"
-version = "3.1.1"
+version = "3.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82fe9db325bcef1fbcde82e078a5cc4efdf787e96b3b9cf45b50b529f2083d67"
+checksum = "5d69265a08751de7844521fd15003ae0a888e035773ba05695c5c759a6f89eef"
 dependencies = [
- "proc-macro2 1.0.89",
+ "proc-macro2 1.0.92",
  "quote 1.0.37",
- "syn 2.0.82",
+ "syn 2.0.90",
 ]
 
 [[package]]
@@ -820,9 +820,9 @@ dependencies = [
 
 [[package]]
 name = "sparsevec"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35df5d2e580b29f3f7ec5b4ed49b0ab3acf7f3624122b3e823cafb9630f293b8"
+checksum = "91ef4657ebc254f6e84a863cb495c2feb60e5b48eba5141bf2bbbe202adb65b4"
 dependencies = [
  "num-traits",
  "packedvec",
@@ -849,11 +849,11 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.82"
+version = "2.0.90"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83540f837a8afc019423a8edb95b52a8effe46957ee402287f4292fae35be021"
+checksum = "919d3b74a5dd0ccd15aeb8f93e7006bd9e14c295087c9896a110f490752bcf31"
 dependencies = [
- "proc-macro2 1.0.89",
+ "proc-macro2 1.0.92",
  "quote 1.0.37",
  "unicode-ident",
 ]
@@ -940,9 +940,9 @@ dependencies = [
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.13"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e91b56cd4cadaeb79bbf1a5645f6b4f8dc5bde8834ad5894a8db35fda9efa1fe"
+checksum = "adb9e6ca4f869e1180728b7950e35922a7fc6397f7b641499e8f3ef06e50dc83"
 
 [[package]]
 name = "unicode-width"
diff --git a/src/lib/vm/objects/block.rs b/src/lib/vm/objects/block.rs
index bb64dc59..61690d4d 100644
--- a/src/lib/vm/objects/block.rs
+++ b/src/lib/vm/objects/block.rs
@@ -74,14 +74,6 @@ pub struct Block {
     pub method_stack_base: usize,
 }
 
-// The following impls are needed to allow the GC to finalise `Block`. By
-// default, `Block` is not `FinalizerSafe` because it has fields to other `Gc`s.
-// These fields would be unsound to access inside a `drop` method, so this
-// explicit impl is needed to tell the compiler we are not doing that. The only
-// time a `Block` is shared between threads is inside a finaliser, which is
-// Sync-safe because we guarantee it will not be accessed at the same time as
-// the main-thread.
-unsafe impl FinalizerSafe for Block {}
 unsafe impl Sync for Block {}
 
 impl Obj for Block {
diff --git a/src/lib/vm/objects/class.rs b/src/lib/vm/objects/class.rs
index f44e74f8..4afcbb95 100644
--- a/src/lib/vm/objects/class.rs
+++ b/src/lib/vm/objects/class.rs
@@ -36,11 +36,6 @@ pub struct Class {
     inst_vars: UnsafeCell<Vec<Val>>,
 }
 
-// This is safe because there is no non-GC'd shared ownership inside `Class`.
-// This means that even though a finalizer will call its drop methods in another
-// thread, it is guaranteed that the finalizer thread will be the only thread
-// accessing its data.
-unsafe impl FinalizerSafe for Class {}
 unsafe impl Sync for Class {}
 
 impl Obj for Class {
diff --git a/src/lib/vm/objects/method.rs b/src/lib/vm/objects/method.rs
index abdf4ebe..4c4c3f3f 100644
--- a/src/lib/vm/objects/method.rs
+++ b/src/lib/vm/objects/method.rs
@@ -17,11 +17,6 @@ pub struct Method {
     pub func: Function,
 }
 
-// By default, `Method` is not `FinalizerSafe` because it contains a `Cell`
-// field. Cell is `!Sync` so it would be unsound to access inside a `drop`
-// method. This explicit impl is needed to tell the compiler we are not doing
-// that.
-unsafe impl FinalizerSafe for Method {}
 unsafe impl Sync for Method {}
 
 impl Obj for Method {
diff --git a/src/lib/vm/objects/mod.rs b/src/lib/vm/objects/mod.rs
index bd0895f8..b4d5d16e 100644
--- a/src/lib/vm/objects/mod.rs
+++ b/src/lib/vm/objects/mod.rs
@@ -80,7 +80,7 @@ impl ObjType {
 /// The main SOM Object trait. Notice that code should almost never call these functions directly:
 /// you should instead call the equivalent function in the `Val` struct.
 #[narrowable_alloy(ThinObj)]
-pub trait Obj: std::fmt::Debug + Send + Sync + FinalizerSafe {
+pub trait Obj: std::fmt::Debug + Send + Sync {
     /// What `ObjType` does this `Val` represent?
     fn dyn_objtype(self: Gc<Self>) -> ObjType;
 
diff --git a/src/lib/vm/objects/string_.rs b/src/lib/vm/objects/string_.rs
index a2d58f24..e17f627e 100644
--- a/src/lib/vm/objects/string_.rs
+++ b/src/lib/vm/objects/string_.rs
@@ -28,11 +28,6 @@ pub struct String_ {
     s: String,
 }
 
-// This is safe because there is no non-GC'd shared ownership inside `String_`.
-// This means that even though a finalizer will call its drop methods in another
-// thread, it is guaranteed that the finalizer thread will be the only thread
-// accessing its data.
-unsafe impl FinalizerSafe for String_ {}
 unsafe impl Sync for String_ {}
 
 impl Obj for String_ {