Outdated dependencies detected in package

Describe the bug

Description

We are using your package as a dependency in our project.

In our internal security scan (conducted via Black Duck), we found that some of the dependencies included in your package have not been updated for more than 12 months.

This includes both runtime and transitive dependencies that are part of your package's dependency tree.

We are raising this issue to make you aware of this observation. Are these outdated dependencies something you plan to update?

Outdated Dependency List (from Black Duck scan)
The following are the dependencies (direct or transitive) in your package that were identified as outdated (last updated >12 months ago):

Expected behavior

You may consider update or remove those ourdated dependencies.

Reproduction code

Reproduction URL

No response

Version

5.5.12

Environment

No response

Additional context

No response

No file or test is named. Start by inspecting the dependency manifests and the RxJS 5.5.12 dependency tree to determine why symbol-observable 1.0.1 is included, then check whether it can be updated or removed without breaking the package. Done means the outdated dependency is addressed and the dependency scan no longer reports it.