diff --git a/src/install/PackageManager/PackageJSONEditor.rs b/src/install/PackageManager/PackageJSONEditor.rs
index 88773115f6a9..f8ed292acb1b 100644
--- a/src/install/PackageManager/PackageJSONEditor.rs
+++ b/src/install/PackageManager/PackageJSONEditor.rs
@@ -1336,9 +1336,9 @@ pub(crate) fn edit(
             // derived from a `StoreRef` to the same `E::EString` is live inside this loop body,
             // so this is the sole mutable borrow.
             let e_string = unsafe { &mut *e_string };
-            // `bun update <pkg>` keeps a `catalog:` reference; `bun add` still replaces it.
+            // `bun update <pkg>` only moves registry entries, like `edit_update_entries`; `bun add` still replaces any entry.
             if manager.subcommand == Subcommand::Update
-                && dependency::Tag::infer(e_string.data.slice()) == dependency::Tag::Catalog
+                && !dependency::Tag::infer(e_string.data.slice()).is_npm()
             {
                 continue;
             }
@@ -1451,6 +1451,8 @@ pub(crate) fn edit(
                     arena_dup(arena, installed)
                 }
 
+                // A range that linked a workspace member has nothing to move to; `workspace:*` is what `bun add` writes.
+                resolution::Tag::Workspace if manager.subcommand == Subcommand::Update => continue,
                 resolution::Tag::Workspace => b"workspace:*",
                 _ => arena_dup(arena, request.version.literal.slice(request.version_buf())),
             };
diff --git a/src/install/lockfile.rs b/src/install/lockfile.rs
index da5691de7ee9..9170295be5f3 100644
--- a/src/install/lockfile.rs
+++ b/src/install/lockfile.rs
@@ -880,6 +880,10 @@ impl Lockfile {
                 let resolved_ids: &[PackageID] = res_list.get(self.buffers.resolutions.as_slice());
                 debug_assert_eq!(resolved_ids.len(), workspace_deps.len());
                 for (&package_id, dep) in resolved_ids.iter().zip(workspace_deps.iter()) {
+                    // The root's implicit `workspaces` rows are not package.json entries; bind to the entry naming the package.
+                    if dep.behavior.is_workspace() {
+                        continue;
+                    }
                     if update.matches(dep, string_buf) {
                         if package_id as usize > self.packages.len() {
                             continue;
diff --git a/test/cli/install/bun-update-lockfile-sync.test.ts b/test/cli/install/bun-update-lockfile-sync.test.ts
index d83f6eb72cf7..1064a9671139 100644
--- a/test/cli/install/bun-update-lockfile-sync.test.ts
+++ b/test/cli/install/bun-update-lockfile-sync.test.ts
@@ -280,6 +280,71 @@ describe.concurrent("bun update rewrites bun.lock together with package.json", (
     await expectInSync(dir);
   });
 
+  // Naming a workspace member used to rewrite the entry linking it to `workspace:*` (or, with --latest / an explicit
+  // range, to send the name to the registry), and to add an entry to a root that did not declare the member.
+  test.each([
+    ["workspace:^", ["pkg1"]],
+    ["workspace:~", ["pkg1"]],
+    ["workspace:1.0.0", ["pkg1"]],
+    ["^1.0.0", ["pkg1"]],
+    ["workspace:^", ["pkg1", "--latest"]],
+    ["workspace:^", ["pkg1@^1.0.0"]],
+    ["workspace:^", ["pkg1@latest"]],
+  ])("a %s entry linking a workspace member is kept as written by bun update %j", async (literal, args) => {
+    const dir = await setup(MONOREPO({}, { dependencies: { pkg1: literal } }));
+    const [pkgBefore, lockBefore] = await Promise.all([pkgText(dir), lockText(dir)]);
+    await run(dir, "update", ...args);
+    expect(await pkgText(dir)).toBe(pkgBefore);
+    expect(await lockText(dir)).toBe(lockBefore);
+  });
+
+  // Same rule for the other non-registry kinds: the registry has a no-deps, so naming this entry with --latest or an
+  // explicit spec used to replace the folder with the registry package (exit 0).
+  test.each([[["no-deps"]], [["no-deps", "--latest"]], [["no-deps@^1.0.0"]], [["no-deps@latest"]]])(
+    "a file: entry is kept as written by bun update %j",
+    async args => {
+      const dir = await setup({
+        "package.json": root({ dependencies: { "no-deps": "file:./local-no-deps" } }),
+        "local-no-deps/package.json": { name: "no-deps", version: "1.0.0" },
+      });
+      const [pkgBefore, lockBefore] = await Promise.all([pkgText(dir), lockText(dir)]);
+      await run(dir, "update", ...args);
+      expect(await pkgText(dir)).toBe(pkgBefore);
+      expect(await lockText(dir)).toBe(lockBefore);
+      expect(await installed(dir, "no-deps")).toMatchObject({ version: "1.0.0" });
+    },
+  );
+
+  test("bun update <workspace member> from a member declaring it keeps the entry as written", async () => {
+    const dir = await setup(WORKSPACES({}, { pkg1: {}, pkg2: { dependencies: { pkg1: "workspace:~" } } }));
+    const [pkgBefore, lockBefore] = await Promise.all([pkgText(dir, PKG2), lockText(dir)]);
+    await runIn(dir, PKG2, "update", "pkg1");
+    expect(await pkgText(dir, PKG2)).toBe(pkgBefore);
+    expect(await lockText(dir)).toBe(lockBefore);
+  });
+
+  test("bun update <workspace member> -r keeps every workspace's entry as written", async () => {
+    const dir = await setup(
+      WORKSPACES(
+        { dependencies: { pkg1: "workspace:^" } },
+        { pkg1: {}, pkg2: { dependencies: { pkg1: "workspace:1.0.0" } } },
+      ),
+    );
+    const [rootBefore, pkg2Before, lockBefore] = await Promise.all([pkgText(dir), pkgText(dir, PKG2), lockText(dir)]);
+    await run(dir, "update", "pkg1", "-r");
+    expect(await pkgText(dir)).toBe(rootBefore);
+    expect(await pkgText(dir, PKG2)).toBe(pkg2Before);
+    expect(await lockText(dir)).toBe(lockBefore);
+  });
+
+  test("bun update <workspace member> does not add it to a root that does not declare it", async () => {
+    const dir = await setup(MONOREPO());
+    const [pkgBefore, lockBefore] = await Promise.all([pkgText(dir), lockText(dir)]);
+    await run(dir, "update", "pkg1");
+    expect(await pkgText(dir)).toBe(pkgBefore);
+    expect(await lockText(dir)).toBe(lockBefore);
+  });
+
   test.each([[[]], [["--latest"]]])("bun update %j leaves folder, tarball and workspace literals alone", async args => {
     const dependencies = {
       "no-deps": "^1.0.0",