Resolving aiohttp Version Conflicts

Mar 3, 2024 ยท 1 min read

You may sometimes see an error like:

could not find a version that satisfies the requirement aiohttp<3.5.0>=3.3.0

This happens when your project has conflicting version requirements for the aiohttp package.

What does this error mean?

Essentially, one part of your project requires aiohttp>=3.3.0, while another part requires aiohttp<3.5.0. So there is no single aiohttp version that can satisfy both requirements simultaneously.

Why does this happen?

Usually because your project has multiple dependencies (or sub-dependencies) that rely on different versions of aiohttp. For example, module A may require aiohttp>=3.4, while module B requires aiohttp<3.5.

How can this be resolved?

Here are a few options:

  • Relax the version requirements if possible. For example, see if module B works with aiohttp>=3.5 rather than strict <3.5.
  • Upgrade/downgrade dependencies to align on a single aiohttp version.
  • Introduce environment/requirement files to "pin" aiohttp and its dependencies to consistent versions across the project.
  • As last resort, fork problematic dependencies to force compatible aiohttp versions.
  • Key Takeaways

  • aiohttp version conflicts arise from inconsistent version requirements
  • Resolutions focus on aligning dependencies to a single aiohttp version
  • Requirement files can help pin transitive dependency versions
  • Start by inspecting your dependencies and their specified aiohttp requirements. The key is coordinating all packages in your project to use a mutually compatible aiohttp release. This may require iterating on relaxing constraints, upgrading packages, and pinning versions until a resolution is found.

    Browse by tags:

    Browse by language:

    The easiest way to do Web Scraping

    Get HTML from any page with a simple API call. We handle proxy rotation, browser identities, automatic retries, CAPTCHAs, JavaScript rendering, etc automatically for you

    Try ProxiesAPI for free

    curl ""

    <!doctype html>
        <title>Example Domain</title>
        <meta charset="utf-8" />
        <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />


    Don't leave just yet!

    Enter your email below to claim your free API key: