diff --git a/src/cli/update_interactive_command.zig b/src/cli/update_interactive_command.zig
index a5e5640041..a06308e400 100644
--- a/src/cli/update_interactive_command.zig
+++ b/src/cli/update_interactive_command.zig
@@ -1981,11 +1981,40 @@ fn updateNamedCatalog(
 }
 
 fn preserveVersionPrefix(original_version: string, new_version: string, allocator: std.mem.Allocator) !string {
-    if (original_version.len > 0) {
-        const first_char = original_version[0];
+    if (original_version.len > 1) {
+        var orig_version = original_version;
+        var alias: ?string = null;
+
+        // Preserve npm: prefix
+        if (strings.withoutPrefixIfPossibleComptime(original_version, "npm:")) |after_npm| {
+            if (strings.lastIndexOfChar(after_npm, '@')) |i| {
+                alias = after_npm[0..i];
+                if (i + 2 < after_npm.len) {
+                    orig_version = after_npm[i + 1 ..];
+                }
+            } else {
+                alias = after_npm;
+            }
+        }
+
+        // Preserve other version prefixes
+        const first_char = orig_version[0];
         if (first_char == '^' or first_char == '~' or first_char == '>' or first_char == '<' or first_char == '=') {
+            const second_char = orig_version[1];
+            if ((first_char == '>' or first_char == '<') and second_char == '=') {
+                if (alias) |a| {
+                    return try std.fmt.allocPrint(allocator, "npm:{s}@{c}={s}", .{ a, first_char, new_version });
+                }
+                return try std.fmt.allocPrint(allocator, "{c}={s}", .{ first_char, new_version });
+            }
+            if (alias) |a| {
+                return try std.fmt.allocPrint(allocator, "npm:{s}@{c}{s}", .{ a, first_char, new_version });
+            }
             return try std.fmt.allocPrint(allocator, "{c}{s}", .{ first_char, new_version });
         }
+        if (alias) |a| {
+            return try std.fmt.allocPrint(allocator, "npm:{s}@{s}", .{ a, new_version });
+        }
     }
     return try allocator.dupe(u8, new_version);
 }
diff --git a/test/cli/update_interactive_formatting.test.ts b/test/cli/update_interactive_formatting.test.ts
index 8e54570781..cb97d2df09 100644
--- a/test/cli/update_interactive_formatting.test.ts
+++ b/test/cli/update_interactive_formatting.test.ts
@@ -1861,6 +1861,51 @@ registry = "${registryUrl}"
     expect(packageJson.dependencies["dep-with-tags"]).toBe("1.0.0");
   });
 
+  it("should preserve npm: alias prefix when updating packages", async () => {
+    const dir = tempDirWithFiles("update-interactive-npm-alias", {
+      "bunfig.toml": `[install]
+cache = false
+registry = "${registryUrl}"
+`,
+      "package.json": JSON.stringify({
+        name: "test-project",
+        version: "1.0.0",
+        dependencies: {
+          "my-alias": "npm:no-deps@1.0.0",
+          "@my/alias": "npm:@types/no-deps@^1.0.0",
+        },
+      }),
+    });
+
+    await using install = Bun.spawn({
+      cmd: [bunExe(), "install"],
+      cwd: dir,
+      env: bunEnv,
+      stdout: "pipe",
+      stderr: "pipe",
+    });
+    expect(await install.exited).toBe(0);
+
+    await using update = Bun.spawn({
+      cmd: [bunExe(), "update", "-i", "--latest"],
+      cwd: dir,
+      env: bunEnv,
+      stdin: "pipe",
+      stdout: "pipe",
+      stderr: "pipe",
+    });
+
+    update.stdin.write("a\n");
+    update.stdin.end();
+
+    const exitCode = await update.exited;
+    expect(exitCode).toBe(0);
+
+    const packageJson = await Bun.file(join(dir, "package.json")).json();
+    expect(packageJson.dependencies["my-alias"]).toBe("npm:no-deps@2.0.0");
+    expect(packageJson.dependencies["@my/alias"]).toBe("npm:@types/no-deps@^2.0.0");
+  });
+
   it("interactive update with mixed dependency types", async () => {
     const dir = tempDirWithFiles("update-interactive-mixed", {
       "bunfig.toml": `[install]
@@ -1891,7 +1936,7 @@ registry = "${registryUrl}"
         name: "@test/workspace1",
         dependencies: {
           "a-dep": "catalog:",
-          "@test/workspace2": "workspace:*", // Workspace dependency
+          "@test/workspace2": "workspace:*",
         },
         devDependencies: {
           "no-deps": "^1.0.0",