---
title: "Version 1.21 release notes | Grafana Pyroscope documentation"
description: "Release notes for Grafana Pyroscope 1.21"
---

[Documentation](/docs/)![breadcrumb arrow](/static/assets/img/icons/grafana-icon-breadcrumb-arrow-gray.svg) [Grafana Pyroscope](/docs/pyroscope/latest/)![breadcrumb arrow](/static/assets/img/icons/grafana-icon-breadcrumb-arrow-gray.svg) [Release notes](/docs/pyroscope/latest/release-notes/)![breadcrumb arrow](/static/assets/img/icons/grafana-icon-breadcrumb-arrow-gray.svg) V1.21

Open source

## Version 1.21.0 release notes

The Pyroscope team is excited to present Grafana Pyroscope 1.21.0.

This release contains enhancements, fixes, and improves stability & performance. It is the final v1.x feature release before Pyroscope 2.0 ships v2 storage as the default.

Notable changes are listed below. For the full diff, check out the [1.21.0 changelog](https://github.com/grafana/pyroscope/compare/v1.20.4...v1.21.0).

### Enhancements

- **debuginfo**: Rewrite upload API to work over HTTP/1.1 ([#5046](https://github.com/grafana/pyroscope/pull/5046))
- **debuginfo**: Add per-request timeout for upload handler ([#5056](https://github.com/grafana/pyroscope/pull/5056))
- **querier**: Add DOT format support to `SelectMergeStacktraces` Connect API ([#5047](https://github.com/grafana/pyroscope/pull/5047))
- **query-frontend**: Log `user_agent` on query log lines ([#5042](https://github.com/grafana/pyroscope/pull/5042))
- **v2**: Move default storage paths under `./data/v2/` ([#4978](https://github.com/grafana/pyroscope/pull/4978))
- Log HTTP protocol version in per-request logs ([#5014](https://github.com/grafana/pyroscope/pull/5014))
- Helm: Add `pyroscope.rbac.create` toggle ([#5067](https://github.com/grafana/pyroscope/pull/5067))
- Helm: Add `HTTPRoute` support ([#4983](https://github.com/grafana/pyroscope/pull/4983))
- Bump `go.opentelemetry.io/otel` to v1.43.0 across all modules ([#5037](https://github.com/grafana/pyroscope/pull/5037))
- Update Go toolchain to 1.25.9 ([#5015](https://github.com/grafana/pyroscope/pull/5015))

### Fixes

- **compactor**: Fix blocks cleaner hanging indefinitely after `SIGTERM` ([#4992](https://github.com/grafana/pyroscope/pull/4992))
- **segment-writer**: Tolerate `ErrServerStopped` in client test suite ([#4977](https://github.com/grafana/pyroscope/pull/4977))
- **scheduler**: Replace `bufconn` with TCP listener to fix flaky test ([#5052](https://github.com/grafana/pyroscope/pull/5052))
- **ui**: Align time-series line graph with actual data points ([#5041](https://github.com/grafana/pyroscope/pull/5041))
- **ui**: Fix file-naming collision when building UI on macOS ([#5055](https://github.com/grafana/pyroscope/pull/5055))
- **ui**: Bump `dompurify`, `immutable`, `brace-expansion` to fix Trivy CVEs ([#5070](https://github.com/grafana/pyroscope/pull/5070))
- **profilecli**: Preserve label-name casing in table output ([#4989](https://github.com/grafana/pyroscope/pull/4989))
- Helm: Remove redundant adaptive-placement default ([#5057](https://github.com/grafana/pyroscope/pull/5057))
- Fix `pkg/test/integration.TestStatusCode` ([#5058](https://github.com/grafana/pyroscope/pull/5058))

### Security fixes

- Bump `protobufjs` to 7.5.5 (security) ([#5062](https://github.com/grafana/pyroscope/pull/5062))
- Bump `protocol-buffers-schema` to 3.6.1 (security) ([#5059](https://github.com/grafana/pyroscope/pull/5059))
- Bump `axios` (security) ([#5045](https://github.com/grafana/pyroscope/pull/5045))
- Bump `lodash` from 4.17.23 to 4.18.1 (security) ([#4974](https://github.com/grafana/pyroscope/pull/4974))
- Bump `rack-session` (security) ([#5003](https://github.com/grafana/pyroscope/pull/5003))
- Bump `rack-session` in `/examples/tracing/ruby` (security) ([#5011](https://github.com/grafana/pyroscope/pull/5011))
- Update `vite` to v8.0.5 (security) ([#4994](https://github.com/grafana/pyroscope/pull/4994))
- Update `github.com/go-jose/go-jose/v4` to v4.1.4 (security) ([#4984](https://github.com/grafana/pyroscope/pull/4984))

### Documentation

- Fix v1 → v2 migration guide prereq check and port-forward race ([#5044](https://github.com/grafana/pyroscope/pull/5044))
- Clarify `HeatmapSlot` timestamp semantics ([#4986](https://github.com/grafana/pyroscope/pull/4986))
- Fix Rust SDK documentation and examples for v2.0.0 ([#4972](https://github.com/grafana/pyroscope/pull/4972))