# E2B Python SDK 2.56.0 drops Python 3.10 and changes HTTP/2 connection pooling

published: 2026-10-13T15:06:23.045Z
topic: infrastructure
source: https://github.com/e2b-dev/E2B/releases/tag/%40e2b%2Fpython-sdk%402.56.0
url: https://aiagentnews.io/stories/e2b-python-sdk-2-56-0-drops-python-3-10-and-changes-http-2-connection-pooling

E2B's Python SDK 2.56.0 raises the minimum supported Python version to 3.11. It also moves stream balancing onto pyqwest's native connection pool and removes the E2B_STREAMS_PER_CONNECTION setting.

The release, published by E2B on GitHub, requires Python 3.11 or newer, so Python 3.10 is no longer supported.

On the HTTP/2 side, the SDK now leans on pyqwest's built-in connection pool instead of a Python-level balancer spread across several transports. A new connection is opened only once every existing one has reached the server's advertised concurrent-stream limit. The number of connections per resolved address is capped by E2B_MAX_CONNECTIONS, which defaults to 200.

The E2B_STREAMS_PER_CONNECTION variable is removed, and the per-connection limit now comes from the server's SETTINGS_MAX_CONCURRENT_STREAMS value. The release also updates the @e2b/dockerfile-utils-python dependency to 0.1.1.

## Why it matters if you build agents

Agent services still running on Python 3.10 will need to upgrade before they can use this SDK version.

Code that set E2B_STREAMS_PER_CONNECTION should switch to E2B_MAX_CONNECTIONS or rely on the server's stream limit instead.