diff --git a/.changeset/polite-ladybugs-begin.md b/.changeset/polite-ladybugs-begin.md
new file mode 100644
index 0000000..bed652f
--- /dev/null
+++ b/.changeset/polite-ladybugs-begin.md
@@ -0,0 +1,5 @@
+---
+'fireworkers': patch
+---
+
+fix: support document IDs that contain hashes
diff --git a/src/utils.ts b/src/utils.ts
index 2fac4c6..2716cc0 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -14,6 +14,11 @@ export const get_firestore_endpoint = (
   const allPaths = ['v1', 'projects', project_id, 'databases', '(default)', 'documents', ...paths];
   const path = allPaths.join('/') + suffix;
 
-  const endpoint = new URL(path, FIRESTORE_ENDPOINT);
+  const endpoint = new URL(FIRESTORE_ENDPOINT);
+
+  // We assign the pathname after instanciating the URL to ensure any hashes are encoded as part of the patname.
+  // This is done to support use cases where users have hashes in their document IDs.
+  endpoint.pathname = path;
+
   return endpoint;
 };