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+---
+title: "cocotb 2.1.0 released"
+date: 2026-08-30
+author: Philipp Wagner
+---
+
+cocotb 2.1.0 is now available.
+This release focuses on improving everyday testbench ergonomics.
+It strengthens concurrency primitives.
+It refines reporting.
+It expands documentation.
+It builds on the major changes introduced in [2.0](_posts/2025-11-19-cocotb-2.0.md).
+It delivers a smoother and more predictable development experience.
+
+## Highlights
+
+### Stackable test decorators
+Test decorators such as `@cocotb.test`, `@cocotb.parametrize`, `@cocotb.xfail`, and `@cocotb.skipif` can now be combined cleanly.
+This makes complex test generation easier to express.
+It aligns cocotb more closely with common pytest workflows.
+
+### Improved xfail/skipif behavior
+`xfail` and `skipif` now support pytest-style semantics.
+They include optional exception types and reason strings.
+This provides more predictable behavior.
+It simplifies integration with CI systems.
+
+### New concurrency primitives
+cocotb 2.1 introduces several new primitives for managing asynchronous tasks.
+TaskManager provides structured task cleanup.
+`gather()` awaits multiple awaitables.
+`wait()` waits on multiple awaitables with configurable conditions.
+`select()` returns whichever awaitable completes first.
+These additions make complex asynchronous flows easier to write.
+They make asynchronous flows easier to reason about.
+
+### JUnit XML improvements
+JUnit reporting now supports file attachments.
+It supports relative path hints.
+It automatically includes logs and waveforms.
+These changes result in richer CI artifacts.
+They make test results easier to inspect.
+
+### Scheduler rewrite
+The internal scheduler has been refactored for clarity.
+It has been refactored for modest performance improvements.
+The new implementation is easier to understand.
+It is easier to debug.
+It lays groundwork for future enhancements.
+
+### Signed integer behavior
+Integers derived from signed HDL objects now preserve signedness.
+This resolves a class of subtle bugs.
+It makes cocotb’s behavior more intuitive when interacting with simulators.
+
+### Documentation improvements
+The quickstart has been expanded and clarified.
+The tutorial has been expanded and clarified.
+General documentation has been expanded and clarified.
+New users benefit from a smoother onboarding experience.
+Experienced users get clearer guidance and examples.
+
+## Python compatibility changes
+
+### Updated Python requirements
+cocotb 2.1 now requires Python 3.9 or newer.
+Support for Python 3.6, 3.7, and 3.8 has been removed, as these versions have reached end-of-life.
+
+### 32-bit binaries (wheels) removed
+Prebuilt wheels for 32-bit Python are no longer provided.
+This primarily affects legacy Windows installations, who used 32-bit simulators (such as ModelSim) with 32-bit Python.
+Source installs remain possible.
+Users are encouraged to migrate to 64-bit Python environments.
+
+## Full changelog
+The complete list of changes is available in the release notes.
+https://docs.cocotb.org/en/stable/release_notes.html#cocotb-2-1-0-2026-08-30