diff --git a/.changeset/update-typescript-go.md b/.changeset/update-typescript-go.md
new file mode 100644
index 00000000..f3612d41
--- /dev/null
+++ b/.changeset/update-typescript-go.md
@@ -0,0 +1,5 @@
+---
+"@effect/tsgo": patch
+---
+
+Update [`typescript-go`](https://github.com/microsoft/typescript-go/commit/18f93b85d447e24e9a03188dd630e7395cad5fe1) to commit `18f93b85d447e24e9a03188dd630e7395cad5fe1`.
diff --git a/flake.nix b/flake.nix
index 24924439..f292fdcd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,7 +7,7 @@
     /* Source of truth: git submodule `typescript-go` commit.
        Keep in sync via `_tools/update-flake-vendor-hash.sh`. */
     typescript-go-src = {
-      url = "github:microsoft/typescript-go/1e58c8419142e35f338840dc50822c48dcc4ec1f?submodules=1";
+      url = "github:microsoft/typescript-go/18f93b85d447e24e9a03188dd630e7395cad5fe1?submodules=1";
       flake = false;
     };
     /* Source of truth: typescript-go's `_submodules/TypeScript` commit.
diff --git a/typescript-go b/typescript-go
index 1e58c841..18f93b85 160000
--- a/typescript-go
+++ b/typescript-go
@@ -1 +1 @@
-Subproject commit 1e58c8419142e35f338840dc50822c48dcc4ec1f
+Subproject commit 18f93b85d447e24e9a03188dd630e7395cad5fe1