Nim 2.2.10

Nim 2.2.10 has been released — the fifth patch release in the Nim 2.2 stable series, bringing targeted fixes to the language's memory management and compiler subsystems. The update was released on April 24, 2026 by the Nim Team.

What Changed

The headline fixes in 2.2.10 center on the ORC/ARC memory management backends. A bug causing extra nimZeroMem and nimCopyMem calls in ORC mode has been resolved, reducing unnecessary memory operations in compiled binaries. Additionally, a SIGSEGV crash affecting captured variables with closure iterators during ARC/ORC reset operations has been fixed — a relief for developers working with functional-style iterator pipelines.

Why It Matters

Nim's ORC (Owned Reference Counting) memory management is the default strategy for Nim 2.x binaries. While reference counting with cycle collection offers deterministic performance, edge cases in closure capture patterns have been a persistent source of runtime crashes. This patch closes several of those gaps, making Nim safer for long-running server applications and game engines where predictable memory behavior is critical.

What's Next

The 2.2.x line continues to receive backported fixes from the development branch. With 2.2.10 now available, the community can expect continued stability improvements. Users already on 2.2.x can upgrade via choosenim 2.2.10 or by downloading the source from the official website.