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Detailed changelog

The most important changes can also be found in the documentation.

2.43.3 (2026-02-12)

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Closed issues:

  • Documentation Improvement - Event hooks #3338

Merged pull requests:

2.43.2 (2026-02-01)

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Merged pull requests:

2.43.1 (2026-01-12)

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Merged pull requests:

2.43.0 (2025-12-30)

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Closed issues:

  • Support for requests >=2.32.5 (compatibility with LangChain/AI ecosystem) #3307
  • Multiple select in web UI for custom arguments #3260
  • Suggestion to Add "iter_lines" Support for "FastHttpUser" in Locust #3018

Merged pull requests:

2.42.6 (2025-11-29)

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Fixed bugs:

  • After Locust upgrade, parameter 'headless = true' in conf file does not work as expected. #3225

Merged pull requests:

2.42.5 (2025-11-20)

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Merged pull requests:

2.42.4 (2025-11-20)

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Closed issues:

  • bumb pytest to support 9.x #3262

Merged pull requests:

2.42.3 (2025-11-15)

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Merged pull requests:

  • Bump the all_dependencies group with 7 updates #3266 (dependabot[bot])
  • Creates dependabot file to keep gh actions updated #3264 (jairhenrique)
  • GH Actions: update uv version, ensure uv.lock doesn't contain anything not in pyproject.toml #3259 (cyberw)
  • Fix single line .conf files incorrectly being treated as toml #3257 (cyberw)

2.42.2 (2025-11-06)

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Merged pull requests:

  • Bump locust-cloud version, fixing an issue with .conf-files #3256 (cyberw)
  • Revert "modified ui_extra_args_dict function to pick arguments" #3255 (cyberw)
  • Update uv.lock #3254 (cyberw)
  • remove setuptools from dependencies #3253 (dotlambda)
  • fix: MQTT client_id and protocol not passed down to Client #3252 (ionutab)

2.42.1 (2025-10-27)

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Merged pull requests:

2.42.0 (2025-10-17)

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Fixed bugs:

  • Extend Locust UI with new tab does not work #3240
  • Reset button not working after stopping the run #3197

Merged pull requests:

2.41.6 (2025-10-10)

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Merged pull requests:

  • Officially support Python 3.14 and test it #3235 (cyberw)

2.41.5 (2025-10-06)

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Merged pull requests:

  • Use www host instead of bare locust.cloud in examples and tests #3234 (cyberw)

2.41.4 (2025-10-06)

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Merged pull requests:

2.41.3 (2025-10-01)

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Merged pull requests:

  • Make workers correctly ignore the --run-time flag #3230 (cyberw)
  • Enhance MilvusUser constructor to support additional collection parameters #3229 (zhuwenxing)

2.41.2 (2025-09-29)

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Fixed bugs:

  • Locust pytest plugin option '--host' conflicts with common user options; suggest renaming to '--locust-host' #3227

Merged pull requests:

  • Pytest plugin: Workaround issue with potential duplicate --host argument definition #3228 (cyberw)
  • Fix Alignment of View Column Selector #3226 (andrewbaldwin44)

2.41.1 (2025-09-25)

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2.41.0 (2025-09-25)

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Fixed bugs:

  • Master doesn't distribute user equally among workers #3209

Merged pull requests:

2.40.5 (2025-09-17)

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Merged pull requests:

  • Avoid wrapping fast response in response context manager when not needed #3222 (cyberw)

2.40.4 (2025-09-11)

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Merged pull requests:

  • Avoid pytest style locustfiles capturing keyboard input #3219 (cyberw)

2.40.3 (2025-09-11)

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Merged pull requests:

  • Bump requests minimum version #3218 (cyberw)
  • Make ResponseContextManager.raise_for_status() consider calls to failure() and success() #3217 (cyberw)

2.40.2 (2025-09-08)

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Fixed bugs:

  • Python 3.13: KeyError: 'name' on request_meta in ResponseContextManager.__exit__ #3207

Merged pull requests:

  • Refactor SocketIOUser to create separate SocketIOClient class #3211 (cyberw)
  • Refactor clients.ResponseContextManager and fix gc issue #3210 (cyberw)

2.40.1 (2025-09-05)

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Fixed bugs:

  • 2.40.0 with pytest and xdist #3202

Merged pull requests:

  • Move pytest plugin to its own directory, to prevent accidental import #3205 (cyberw)
  • Pytest plugin: Delay imports to avoid monkey patching until someone uses the fixtures #3204 (cyberw)

2.40.0 (2025-09-04)

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Fixed bugs:

Merged pull requests:

  • Avoid exception in HttpUser if requests has lost track of the request it made #3201 (cyberw)
  • Support pytests as locustfiles #3200 (cyberw)
  • Refactor FastHttpSession to be more like HttpSession #3198 (cyberw)
  • Update Dockerfile base to Python 3.13 #3193 (adaamz)

2.39.1 (2025-08-29)

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Merged pull requests:

2.39.0 (2025-08-19)

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Merged pull requests:

2.38.1 (2025-08-12)

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Closed issues:

  • Support for markov chains to describe a user's behavior #3156
  • Switch docker base image to one with uv preinstalled #3061

Merged pull requests:

2.38.0 (2025-08-07)

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Fixed bugs:

  • Failures table sorting is reset to ascending after a few seconds #3184
  • argparse.ArgumentError: argument --profile: conflicting option string: --profile (locust==2.37.14) #3180

Merged pull requests:

2.37.14 (2025-07-16)

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Merged pull requests:

2.37.13 (2025-07-15)

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Fixed bugs:

  • Locust can't install on alpine linux anymore #3166

Closed issues:

  • Decouple the JavaScript asset code from the report #3064

Merged pull requests:

2.37.12 (2025-07-08)

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Fixed bugs:

  • Error shutting down when using processes #3161
  • 1279 Locust instances makes master run at 100% continously #3142

Merged pull requests:

  • Attempt to increase open file limit (RLIMIT_NOFILE) even on master. #3162 (cyberw)
  • Bump brace-expansion from 1.1.11 to 1.1.12 in /locust/webui #3160 (dependabot[bot])

2.37.11 (2025-06-23)

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Fixed bugs:

  • FastHttpUser uses incorrect regex to hide home directory #3159

Closed issues:

  • Define a list of paths to simulate an user journey #3150
  • export the results as a json file #3089

Merged pull requests:

2.37.10 (2025-06-07)

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Merged pull requests:

  • Revert accidental removal of --json-file option #3154 (brtkwr)

2.37.9 (2025-06-05)

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Merged pull requests:

2.37.8 (2025-06-05)

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Closed issues:

  • Support gevent >= 25.4.1 #3143

Merged pull requests:

  • Bump locust-cloud dependency, allow 25.x versions of gevent #3151 (cyberw)

2.37.7 (2025-06-03)

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Merged pull requests:

2.37.6 (2025-05-28)

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Fixed bugs:

  • Documentation is Now Missing Table of "All available configuration options" #3144

Merged pull requests:

2.37.5 (2025-05-22)

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Fixed bugs:

  • Web UI Does Not Switch to Details Page Immediately on Test Start in Current Version #3128

Merged pull requests:

2.37.4 (2025-05-19)

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2.37.3 (2025-05-14)

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Merged pull requests:

2.37.2 (2025-05-13)

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Fixed bugs:

  • p95 response time increases with the number of unique URLs #3134
  • FastResponse.failure() takes 1 positional argument but 2 were given #3084

Merged pull requests:

  • Webui: Block Submitting SwarmForm in Distributed Mode with no Workers #3138 (andrewbaldwin44)
  • Fixes #3134 - Improve the performance of the /stats/requests endpoint #3136 (orf)
  • Bump vite from 6.3.2 to 6.3.4 in /locust/webui #3132 (dependabot[bot])

2.37.1 (2025-05-07)

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Fixed bugs:

  • --json-file always creates empty file #3130

Closed issues:

  • Forced Dependency Updates (e.g., python-socketio) May Cause Version Mismatch with Java Services #3129

Merged pull requests:

  • Fix --json-file (actually save data to file) #3131 (zed)

2.37.0 (2025-05-05)

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Merged pull requests:

2.36.2 (2025-04-25)

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Merged pull requests:

2.36.1 (2025-04-24)

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Merged pull requests:

2.36.0 (2025-04-24)

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Merged pull requests:

2.35.0 (2025-04-16)

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Merged pull requests:

2.34.1 (2025-04-09)

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Merged pull requests:

2.34.0 (2025-04-06)

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Merged pull requests:

2.33.2 (2025-03-14)

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Fixed bugs:

  • There was a heartbeat disconnect during the pressure test #3065

Closed issues:

  • Error Logging in FastHttpUser #2937

Merged pull requests:

2.33.1 (2025-03-08)

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Fixed bugs:

  • --iterations with locust==2.33.0 and locust-plugins==4.5.3 #3071
  • uv.lock ends up in root of site-packages #3053

Merged pull requests:

  • Fix html file naming crash, simplify code #3072 (cyberw)

2.33.0 (2025-02-22)

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Fixed bugs:

  • UnboundLocalError: local variable 'user_count' referenced before assignment #3051

Merged pull requests:

  • docs: update python-requests documentation links #3059 (n0h0)
  • dos: correct venv activation path in docs #3058 (n0h0)
  • Use enter to automatically open web UI in default browser #3057 (cyberw)
  • Update vite to 6.0.11 #3056 (cyberw)
  • Remove uv lock file from build artifacts #3055 (mquinnfd)
  • Improve error message on missing user_count or spawn_rate in swarm payload #3052 (cyberw)
  • Enable HTML Report Filename Parsing #3049 (ktchani)
  • FastHttpUser: Accept brotli and zstd compression encoding #3048 (kamilbednarz)
  • Bump vitest from 2.1.6 to 2.1.9 in /locust/webui #3044 (dependabot[bot])

2.32.10 (2025-02-18)

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Closed issues:

  • Switch from Poetry to uv #3033

Merged pull requests:

2.32.9 (2025-02-10)

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Fixed bugs:

  • Cannot Update Custom options in the Web UI when Default Value is None #3011

Merged pull requests:

2.32.8 (2025-01-30)

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2.32.7 (2025-01-30)

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Merged pull requests:

2.32.6 (2025-01-13)

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Merged pull requests:

  • Update Dockerfile to use Python 3.12 as base #3029 (vejmoj1)
  • Update tests to check for hostname instead of fqdn #3027 (ajt89)
  • Move some argument parsing/validation from main.py to argument_parser.py and remove deprecated parameter --hatch-rate #3026 (ftb-skry)
  • pin poetry-core version to <2.0.0 in pyproject.toml #3025 (mgor)
  • Optimize run time of some unit tests #3020 (cyberw)

2.32.5 (2024-12-22)

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Merged pull requests:

  • Make cpu usage check sleep BEFORE the first check, and make it slightly less frequent #3014 (cyberw)
  • FastHttpUser: Fix ssl loading performance issue by avoiding to load certs when they wont be used anyway #3013 (cyberw)
  • Treat exceptions in init event handler as fatal #3009 (cyberw)
  • Add create store export #3004 (andrewbaldwin44)

2.32.4 (2024-12-01)

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Fixed bugs:

  • Number of requests lower than expected in web UI #3000
  • Reports download links do not contain web-base-path #2998
  • Setuptools CVE-2024-6345 #2995
  • When using exclude-tags to exclude more than two tags, this setting will not take effect #2994

Merged pull requests:

2.32.3 (2024-11-17)

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Fixed bugs:

  • Setuptools CVE-2022-40897 #2986
  • master crash with different version worker #2975

Merged pull requests:

  • Ensure we never use old version of setuptools #2988 (cyberw)
  • README Themed Screenshots #2985 (andrewbaldwin44)
  • When specifying locustfile fia url, output start of response text when it wasnt valid python #2983 (cyberw)
  • Use debug log level for first 5s of waiting for workers to be ready. #2982 (cyberw)
  • Add option for Extra Options to be Required #2981 (andrewbaldwin44)
  • Update ruff mypy #2978 (tdadela)
  • Fix crash with older worker version requesting locustfile from master #2976 (cyberw)
  • Use f-strings instead of old style string interpolation #2974 (tdadela)

2.32.2 (2024-11-08)

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Fixed bugs:

  • Requests not ramping up after switching to using pydantic in django project #2960
  • The locust chart shows that data is still being recorded after the timed run time expires #2910

Closed issues:

  • Downloading report should provide a meaningful human name #2931
  • Hard coded path make it impossible to host the UI on a path (instead of the domain root) #2909

Merged pull requests:

2.32.1 (2024-10-29)

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Closed issues:

  • Add option to enable different statistics in the chart menu #2946

Merged pull requests:

2.32.0 (2024-10-15)

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Fixed bugs:

  • logfile is erroniously written when there are many workers. #2927
  • Form field for users, spawn rate, and run time still visible in UI although CustomShape defined without use_common_options. #2924
  • --html with --process 4 then get ValueError: StatsEntry.use_response_times_cache must be set to True #2908
  • IPV6 check doesn't work as expected on AWS EKS #2787

Merged pull requests:

2.31.8 (2024-09-28)

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Merged pull requests:

2.31.7 (2024-09-25)

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Merged pull requests:

2.31.4.dev9994 (2024-09-16)

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2.31.4.dev9993 (2024-09-16)

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2.31.4.dev9992 (2024-09-16)

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2.31.4.dev9991 (2024-09-16)

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2.31.4.dev999 (2024-09-16)

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2.31.6 (2024-09-15)

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Fixed bugs:

  • RPS vs Total Running Users #2895
  • Overwriting weight by config-users may lead to crash #2852
  • FastHttpSession requests typing for the json argument should support lists #2842
  • Dockerfile warning #2811

Closed issues:

  • Cleaning up the build process #2857
  • Simplify GitHub Actions using install-poetry #2822

Merged pull requests:

2.31.5 (2024-08-30)

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Fixed bugs:

  • Pressure testing is over, but RPS and Users still have data #2870

Merged pull requests:

2.31.4 (2024-08-26)

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Merged pull requests:

2.31.3 (2024-08-15)

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Fixed bugs:

  • Brew installed locust missing UI assets #2831
  • response avg time is NaN #2829
  • Windows Action Runs Wrong Version of Locust #2796

Merged pull requests:

2.31.2 (2024-08-06)

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Merged pull requests:

  • Prebuild UI in PyPi publish steps so that even source distributions contain web UI code #2839 (mquinnfd)
  • Add Tests for Web UI Line Chart #2838 (andrewbaldwin44)
  • Documentation: Configure html_baseurl and jinja on RTD #2837 (plaindocs)

2.31.1 (2024-08-05)

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Merged pull requests:

  • Fix issue with downloading HTML report, update package.json for webui build #2834 (andrewbaldwin44)

2.31.0 (2024-08-05)

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Merged pull requests:

2.30.0 (2024-07-31)

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Fixed bugs:

  • Locust / pypy fails with "AttributeError: module 'gc' has no attribute 'freeze'" error. #2818
  • Worker sometimes fails to send heartbeat after upgrade to urllib3>=1.26.16 #2812
  • Web UI lacking asset #2781

Closed issues:

  • Charts Update Is Delayed #2771
  • Use itertools.cycle in SequentialTaskSet #2740
  • SequentialTaskSet handles task weights in an inconsistent way #2739

Merged pull requests:

  • Update poetry windows tests #2821 (mquinnfd)
  • Fix pypy gc.freeze() AttributeError #2819 (jimoleary)
  • Fix Dockerfile style warning #2814 (mehrdadbn9)
  • Avoid deadlock in gevent/urllib3 connection pool (fixes occasional worker heartbeat timeouts) #2813 (tdadela)
  • Replace total avg response time with 50 percentile (avg was broken) #2806 (andrewbaldwin44)
  • Add example of a bottlenecked server and use that test to make a new graph for the docs #2805 (cyberw)
  • Fix tests on windows #2803 (mquinnfd)
  • Provide warning for local installs where yarn is not present #2801 (mquinnfd)
  • Fix Extend Webui Example #2800 (andrewbaldwin44)
  • Correctly set version from Poetry in published builds #2791 (mquinnfd)
  • Fix StatsEntry docstring #2784 (tdadela)
  • dispatch benchmark test improvements #2780 (tdadela)
  • Typing: strict optional in dispatch.py #2779 (tdadela)
  • new events for heartbeat and usage monitor #2777 (mgor)
  • FastHttpSession requests typing #2775 (tdadela)
  • Remove Line Chart Default Zoom #2774 (andrewbaldwin44)
  • FastHttpSession: Enable passing json as a positional argument for post() and stop converting response times to int #2772 (tdadela)
  • SequentialTaskSet: Allow weighted tasks and dict in .tasks #2742 (bakhtos)
  • Implement Poetry build system (mainly so we don't have to commit dynamically generated front end bundles to git) #2725 (mquinnfd)

2.29.1 (2024-06-25)

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Fixed bugs:

  • locust/webui/dist/index.html script errors. #2753

Merged pull requests:

2.29.0 (2024-06-07)

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Fixed bugs:

  • The time of the downloaded html report is not correct #2691
  • Event spawning_complete fires every time a user is created #2671
  • Delay at startup and high cpu usage on Windows in Python 3.12 #2555

Closed issues:

  • Log a warning if getting locustfile from master takes more than 60s #2748
  • Show the reset button even after stopping a test #2723
  • Add date to charts in web UI #2678

Merged pull requests:

2.28.0 (2024-05-23)

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Fixed bugs:

  • The Charts presentation in the report downloaded by locust is problematic #2706
  • Locust insists on using IPv6 despite being in an IPv4 stack. #2689
  • When there is an error in the FAILURES of the front-end page when there is a worker, there is no escape. #2674

Closed issues:

  • Pin the headers and aggregated row to the top and bottom of the window #2688
  • Remove legacy UI #2673
  • TaskSet's _task_queue should be a collections.deque? #2653

Merged pull requests:

  • Pin the headers to the top of the window #2717 (JavierUhagon)
  • Dont enable ipv6 for zmq if no ipv6 stack exists #2715 (cyberw)
  • Give better error message if User subclass doesnt call base constructor #2713 (cyberw)
  • Stop quoting error messages an extra time in distributed mode #2712 (cyberw)
  • Lower log levels for exceptions in flask #2711 (cyberw)
  • Stop HTML escaping errors for /stats/requests endpoint #2710 (cyberw)
  • Update Stats History on HTML Report #2709 (andrewbaldwin44)
  • Logging: Only print hostname instead of FQDN #2705 (cyberw)
  • Remove legacy UI #2703 (andrewbaldwin44)
  • WebUI: update users, spawn_rate, host and run_time in parsed_options (for LoadShapes that might access it) #2656 (raulparada)

* This Changelog was automatically generated by github_changelog_generator