langflow-ai/langflow 1.6.0 on GitHub

What's Changed

✨ New Features

feat: add utility to insert code field into build config dictionary by @ogabrielluiz in #8933
feat: Add dark mode support to JigsawStackIcon by @Cristhianzl in #9013
feat: add node alignment helper lines with toggle control in flow editor by @Cristhianzl in #8279
feat(database): add noop mode with config flag and update related tests by @ogabrielluiz in #9054
feat: Move to Biome for linting and formatting by @mfortman11 in #8997
ref: refactor MCP-related functionality centralizing common utilities by @edwinjosechittilappilly in #9059
feat: add module and code hash to component's metadata by @ogabrielluiz in #8737
feat: added code coverage reporting by @epinzur in #9081
feat: Add CustomMarkdownField wrapper component by @Cristhianzl in #9042
feat: Add dual output support to Agent component with structured JSON parsing by @rodrigosnader in #8836
feat: adds authentication to mcp server under feature flag by @lucaseduoli in #9095
ref: make superuser creation more multi-user friendly by @jordanrfrazier in #9019
feat: Add smoke tests workflow for PR validation by @Yukiyukiyeah in #9125
feat: Add template tests by @Yukiyukiyeah in #9083
feat: Add .env file support to Windows build scripts by @Cristhianzl in #9214
feat: add InputFile customization by @Cristhianzl in #9233
feat: generate custom coverage config to omit legacy and external compoents by @epinzur in #9221
feat: added install matrix before release by @epinzur in #9205
feat: Add Gemini 2.5 and 2.0 model metadata by @Cristhianzl in #9277
feat: Add GPT-5 series models to OpenAI metadata by @edwinjosechittilappilly in #9336
feat: Add support for Ingestion and Retrieval of Knowledge Bases by @erichare in #9088
feat(utils): add code hash generation and module name in Custom Components by @ogabrielluiz in #9107
feat: update Composio components by @abhishekpatil4 in #8868
feat: Add exception telemetry by @Yukiyukiyeah in #9194
feat: for postgresql DatabaseService create engine set default utc timezone by @jeevic in #8112
feat: Move Vector Stores to Bundle by @erichare in #9475
feat: Make knowledge bases user-stored and support global vars by @erichare in #9458
feat: Add support for advanced parsing with docling in the File Component by @erichare in #9398
feat: Added Traceloop SDK for collecting traces and metrics from Langflow by @2getsandesh in #9317
feat: migrate from loguru to structlog by @ogabrielluiz in #9321
feat: adds api key functionality onto mcp composer by @lucaseduoli in #9498
feat: enhance structured output handling with new input fields by @edwinjosechittilappilly in #9483
feat: encrypt oauth auth settings at rest by @jordanrfrazier in #9490
feat: Canvas toolbar update and enhancement by @deon-sanchez in #9239
feat: add static dependency analysis module and update metadata handling by @ogabrielluiz in #9192
feat: add new segmented sidebar by @mfortman11 in #9355
feat: enable real-time refresh for Base URL input in ChatOllamaComponent by @philnash in #9346
feat: OpenAI compatibility by @phact in #9069
feat: remove agent dual output by @edwinjosechittilappilly in #9700
feat: mcp composer integration by @jordanrfrazier in #9506
feat: double clicking a component will add it to the canvas by @deon-sanchez in #9730
feat: Enhance logging configuration with caller information and conditional callsite data by @ogabrielluiz in #9747
feat: Knowledge Ingestion template behind a feature flag by @deon-sanchez in #9947
feat: add customization layer for duplicate file functionality by @italojohnny in #9953

🐛 Bug Fixes

bug: re-add NVIDIA Remix starter template by @phact in #8994
bug: fix check for server ready when using 0.0.0.0 as host by @jordanrfrazier in #9002
fix: add truncation to error by @lucaseduoli in #9026
fix: Prevent Authorization header on external URLs by @Cristhianzl in #9061
fix: enhance API snippet generation with file upload support and consistent authentication by @namastex888 in #9018
fix: Improve duplicate flow name handling and add comprehensive tests by @Cristhianzl in #8962
fix: update text truncation limits to allow better visibility by @lucaseduoli in #9147
fix: updated design of info button on files component by @lucaseduoli in #9146
fix: make cleanlab evaluator outputs not be grouped by @lucaseduoli in #9149
fix: Relax redis dependency version constraint by @edwinjosechittilappilly in #9154
fix: refactor bundle and component names by @lucaseduoli in #9140
fix: Add releaseStage-aware version comparison logic by @Cristhianzl in #8998
fix: Mcp composer tool header fix by @mfortman11 in #9161
fix: refactor auth modal design for mcp composer by @lucaseduoli in #9180
fix: store mcp sse headers and use them on connection by @lucaseduoli in #9148
fix: prevent unintentional sidebar text selection by @rodrigosnader in #8895
fix: Exclude base path from custom component loading by @Cristhianzl in #9098
fix: add data-testid to new project button in EmptyFolder component by @ogabrielluiz in #9222
fix: remove duplicated Makefile target format_frontend by @italojohnny in #9191
fix: Add metadata filtering for Chroma components by @Cristhianzl in #9137
fix: Add outputs support to SQLAgentComponent by @Cristhianzl in #9173
fix: Improve session fixture cleanup and engine handling by @edwinjosechittilappilly in #9352
fix: increase Test time out by @edwinjosechittilappilly in #9353
fix: improve process cleanup in MCP tests by @italojohnny in #9354
fix: pin uv to 0.5.6 to restore CI compatibility by @italojohnny in #9362
fix: add cursor state to not skip to end on input components by @lucaseduoli in #9375
fix: make settings nav not enter history by @lucaseduoli in #9376
fix: make tools be selected on mcp server after opening for the first time by @lucaseduoli in #9377
fix: add langchain-chroma to langflow-base by @ogabrielluiz in #9396
fix: Set 'Include Metadata' as non-advanced option by @edwinjosechittilappilly in #9400
fix: enforce authentication for superuser cli command by @jordanrfrazier in #9152
fix: Allow connections to save file output by @erichare in #9386
fix: fallback to env var correctly when using tweaks by @jordanrfrazier in #9422
fix: mask Component Secrets in trace logs by @psy42a in #8204
fix: remove duplicate embeddings category, refactor render code by @lucaseduoli in #9446
fix: silent error fix in KB components by @edwinjosechittilappilly in #9433
fix: Adjust uniqueness constraint on file names by @erichare in #9014
fix: Use the identifier column as hash if available by @erichare in #9405
fix: use correct import for EventManager by @tsuliuchao in #9408
fix: Use Runnable's asynchronous methods to prevent blocking the main… by @sunbingchuan in #9466
fix: Manage multi-region databases and better handle lexical search in Astra DB by @erichare in #9385
fix: Composio base to handle dataframe response correctly by @Uday-sidagana in #9427
fix: preserve user-selected model when updating available options by @italojohnny in #9495
fix: move Docling worker to base module and update imports by @ogabrielluiz in #9471
fix: file upload test by @lucaseduoli in #9502
fix: change template test to run every time by @Yukiyukiyeah in #9489
fix: incorrect Perplexity API parameter names by @arvy in #9278
fix(apply_tweaks): skip tweaks to code field and log warning by @ogabrielluiz in #9467
fix: set mcp_composer feature as true by default by @lucaseduoli in #9522
fix: add dropdown click to general bugs test by @lucaseduoli in #9549
fix: add bigger timeout to pokedex test by @lucaseduoli in #9551
fix: increase timeout on saas pricing test by @lucaseduoli in #9552
fix: change chatOutput drop coordinates on general bugs test by @lucaseduoli in #9554
fix: Log steady-state performance in component loading test by @ogabrielluiz in #9561
fix: Run docling processing in subprocess by @erichare in #9541
fix: Avoid namespace collision for Astra by @erichare in #9544
fix: Revert to a working composio release for module import by @erichare in #9569
fix: Knowledge base component refactor by @erichare in #9543
fix: Fix env file handling in Windows build scripts by @Cristhianzl in #9414
fix: update agent_llm display name to "Model Provider" in AgentComponent by @edwinjosechittilappilly in #9564
fix: use custom file handler on chat view, disable mcp_composer by default by @lucaseduoli in #9550
fix: Use the newest file component in Vector Store RAG Template by @erichare in #9571
fix: AI/ML icon is missing by @deon-sanchez in #9553
fix: Allow updates to the file component in templates using it by @erichare in #9572
fix: Fixes filtering so legacy components aren't shown by default by @mfortman11 in #9575
fix: changed name on tool mode to slug, added close button to sidebar by @lucaseduoli in #9589
fix: enhance scroll behavior on playground by @lucaseduoli in #9586
fix: delete duplicate Serper api from google bundle by @lucaseduoli in #9601
fix: allow deletion of mcp servers, add tests for mcp sidebar by @lucaseduoli in #9587
fix: change zoom in and out limit, create tests for zooming in and out, change zoom out logic in canvasControls by @lucaseduoli in #9595
fix: Add localStorage persistence for feature toggles by @Cristhianzl in #9597
fix: Add help text to Lock Flow option by @Cristhianzl in #9600
fix: Add comprehensive tests and improve minimal condition logic by @Cristhianzl in #9611
fix: change icon color for mcp, remove color setting of icons by @lucaseduoli in #9594
fix: remove unsupported styling options from chats components by @italojohnny in #9610
fix: disable mcp auto install for not installed applications, refactor mcp-projects logic by @lucaseduoli in #9599
fix: Properly allow the non-specification of an OCR Engine by @erichare in #9617
fix: Support objects with data attribute in body processing by @Cristhianzl in #9644
fix: Add comprehensive message sorting + tests by @Cristhianzl in #9641
fix: Fix audio recording resource cleanup by @Cristhianzl in #9623
fix: Add voice mode availability detection by @Cristhianzl in #9621
fix: Remove formatting from agent input text content by @Cristhianzl in #9638
fix: added most important types at the beginning of the extensions array on File component by @lucaseduoli in #9639
fix: Include flow ID in webhook URLs by @Cristhianzl in #9624
fix(logger): add optional cache to configure; update caching behavior by @ogabrielluiz in #9532
fix: Update sidebar border styles by @mfortman11 in #9625
fix: Remove top padding from sidebar groups by @Cristhianzl in #9636
fix: disable message editing on playground, fix new session not persisting after message is sent by @lucaseduoli in #9662
fix: disable elevate edges on node select by @lucaseduoli in #9658
fix: Properly respect the order parameter for Message History by @erichare in #9605
fix: Return multi-row dataframe when Structured Output data supports it by @erichare in #9659
fix: apply to fields in settings page by @edwinjosechittilappilly in #9602
fix: Segmented Sidebar switch to search on value change by @mfortman11 in #9615
fix: deprecate claude 3 sonnet model by @edwinjosechittilappilly in #9622
fix: Properly import Langchain ToolMessage for Message options by @erichare in #9675
fix: fixed user settings test by @lucaseduoli in #9690
fix: Remove warning log for unset TRACELOOP_API_KEY in configuration validation by @ogabrielluiz in #9536
fix: knowledge base fixes for 1.6 pointing to release branch by @deon-sanchez in #9683
fix: remove github link on discord button by @lucaseduoli in #9655
fix: remove python code component, fix placeholder not appearing by @lucaseduoli in #9660
fix: add margins to
tag in markdown by @lucaseduoli in #9656
fix: delete unused components, delete [deprecated] tag on the component title, add Replace and legacy tag functionality to components by @lucaseduoli in #9645
fix: Ensure correct Docling Remote URL for API by @erichare in #9708
fix: Adjust padding and layout for improved spacing by @Cristhianzl in #9711
fix: remove Groq from Agents model provider list by @edwinjosechittilappilly in #9616
fix: conditional scheduling logic to not run branch by @jordanrfrazier in #9722
fix: disable keys when flow is locked by @lucaseduoli in #9726
fix: superuser credential handling and AUTO_LOGIN security by @edwinjosechittilappilly in #9542
fix: update logs position to be absolute by @lucaseduoli in #9724
fix: make entire playground chat area be clickable by @lucaseduoli in #9721
fix: Restore old description from file component. by @erichare in #9752
fix: Preserve flows and components during project updates by @Cristhianzl in #9750
fix(langwatch): prevent trace errors with proper API key validation by @italojohnny in #9720
fix(URLComponent): filter out None in headers to avoid silent serialization errors by @ogabrielluiz in #9596
fix: put knowledge bases under feature flag by @lucaseduoli in #9749
fix: Updated Agent Starter Projects with new Templates by @deon-sanchez in #9772
fix: remove agents from skipped components list in setup by @edwinjosechittilappilly in #9785
fix: improve error handling for missing OCR dependencies by @italojohnny in #9753
fix: adjust casing on Add MCP Server buttons by @lucaseduoli in #9774
fix: set gpt4.1 as default model by @edwinjosechittilappilly in #9780
fix: release branch tests by @jordanrfrazier in #9820
fix: Properly serialize documents for Graph RAG in Astra by @erichare in #9777
fix: Standardize content dict format for LLM provider compatibility by @Cristhianzl in #9745
fix: make components added with filter come with the output pre-selected, fix Agent filtering by @lucaseduoli in #9787
fix: make mcp tools refresh when changing server with the same name by @lucaseduoli in #9778
fix: remove extra spaces from playground, added separator by @lucaseduoli in #9779
fix: Update message schema tests for image_url structure by @Cristhianzl in #9823
fix: Restore Embedding Model Connections in Vector Store RAG by @erichare in #9776
fix: update CORS configuration and add env vars to allow for user control by @jordanrfrazier in #9744
fix: handle pandas Series in get_message boolean evaluation by @italojohnny in #9765
fix: Add VLM support for Docling and improve deps by @erichare in #9757
fix: make cursor position not go to end on input list component by @lucaseduoli in #9782
fix: remove metadata building to speed up load times by @ogabrielluiz in #9819
fix: turn mcp composer feature on by default on frontend by @lucaseduoli in #9831
fix: make astra db component not disconnect, fix handle color when type is undefined by @lucaseduoli in #9829
fix: Handle ImportError for parse_api_endpoint and remove debug logging by @ogabrielluiz in #9830
fix: make session_id visible in Message History Retrieve mode by @Vigtu in #9557
fix: make mcp tools update when auth settings is null by @lucaseduoli in #9844
fix: adjust tools title and description padding by @lucaseduoli in #9847
fix: Apply a per-user uniqueness for mcp by @erichare in #9840
fix: make file button clickable after focusing on chat by @lucaseduoli in #9863
fix: make input clickable on chat by @lucaseduoli in #9864
fix: Remove the uniqueness constraint on file names by @erichare in #9872
fix: Load flows autologin false by @phact in #9578
fix: Move docling dependency into core dependencies instead of dev by @erichare in #9906
fix: Make sure strings can be parsed in the python interpreter by @erichare in #9908
fix: Enhance limit parameter handling and update deps by @Cristhianzl in #9921
fix: Disable Docling by default with macOS Intel by @erichare in #9944
fix: Bug in the Environment variable text input: after every letter I need to click the box to enter the next letter. by @deon-sanchez in #9943
fix: type handling in file component by @jordanrfrazier in #9965

📝 Documentation Updates

docs: rag chatbot tutorial by @mendonk in #8929
docs: add env var setup for macOS and Windows GUI by @italojohnny in #8181
docs: skip auth note by @mendonk in #8992
docs: Repurpose Concepts section to focus on the visual editor and flows by @aimurphy in #8845
docs: agents tutorial by @mendonk in #8961
docs: Configure Segment by @mlr in #8996
docs: Fix a label in the left nav by @aimurphy in #9012
docs: convert md to mdx by @mendonk in #9041
docs: patch versions may differ between OSS and Desktop by @mendonk in #9016
docs: file loader output behavior by @mendonk in #9045
docs: OpenAPI spec version upgraded from 1.4.3 to 1.5.0.post1 by @github-actions[bot] in #9049
docs: Add heading and codeblock events for segment by @mlr in #9050
docs: remove google oauth integrations by @mendonk in #9047
Improve documentation: Component Overview section by @Victor-w-Madeira in #9056
docs: remove unused template by @mendonk in #9073
docs: clarify group components false behavior by @mendonk in #9046
docs: add deepwiki badge to readme by @mendonk in #9079
docs: endquote in code alias by @mendonk in #9080
docs: add mcp tutorial by @mendonk in #9022
docs: data types by @mendonk in #9074
docs: update components-helpers.mdx by @mendonk in #9120
docs: Various edits related to style, syntax, and adding more detail to some pages by @aimurphy in #9132
docs: update integrations-docling.mdx by @mendonk in #9131
docs: user feedback items by @mendonk in #9122
docs: Move small edits to reduce scope of PR 9115 by @aimurphy in #9135
docs: langflow 1.5 auto-login security doc by @mendonk in #9057
docs: expand multiple outputs section to include group_outputs behavior by @Victor-w-Madeira in #9075
docs: reduce duplicate content in contributing.md by @mendonk in #9136
docs: Restructure navigation, refactor all component documentation, among many other things by @aimurphy in #9115
docs: fix typo in left nav by @aimurphy in #9160
docs: refresh external postgresql database page by @mendonk in #9174
docs: Audit use of tabs and details by @aimurphy in #9196
docs: refresh develop overview page by @mendonk in #9177
docs: refresh remote server page by @mendonk in #9189
docs: Audit admonitions, related links, and prerequisites for style and consistency by @aimurphy in #9217
docs: combine api keys and authentication pages by @mendonk in #9172
docs: fixed broken links in CONTRIBUTING.md by @harjoben in #9231
docs: Touchup cloud provider deployment pages by @aimurphy in #9241
docs: LANGFLOW_ENABLE_SUPERUSER_CLI environment variable by @mendonk in #9223
docs: Remove template pages because templates already include explanatory notes within Langflow by @aimurphy in #9235
docs: reference exported key by @mendonk in #9245
docs: refresh docker page by @mendonk in #9208
docs: Fix a broken anchor by @aimurphy in #9249
docs: Standardize style of component names, especially when used in links by @aimurphy in #9251
docs: Add more detail to some template notes by @aimurphy in #9230
docs: refresh telemetry page by @mendonk in #9272
docs: add example for plist by @mendonk in #9294
docs: kubernetes best practices and postgresql dba guide by @mendonk in #9226
docs: refresh cli page by @mendonk in #9274
docs: refresh custom dependencies page by @mendonk in #9291
docs: Hide previous docs draft build comments on new build by @mlr in #9334
docs: clarify available API endpoints and their use cases by @mendonk in #9382
docs: clarify file upload with API snippet by @mendonk in #9384
docs: Correct the instructions for additional language models that aren't built-in to the primary Language Model component. by @aimurphy in #9406
docs: Update, refresh, and expand Vector Store and Processing component documentation by @aimurphy in #9407
docs: custom component directory requires an init.py file by @mendonk in #9447
docs: clarify adding custom packages to REPL component by @mendonk in #9450
docs(graph): fix typo in comment by @HzaRashid in #9436
docs: New theme colors, minimized footer, and slight style changes for readability of certain elements by @aimurphy in #9250

🛠 Maintenance Tasks

refactor: Improve HomePage state management and tab switching by @Cristhianzl in #8989
refactor: Improve HeaderButtons state sync with userData by @Cristhianzl in #8988
refactor(api): update /config endpoint to use ConfigResponse.from_settings by @ogabrielluiz in #8674
refactor: Update icon dark mode comparison by @mfortman11 in #9060
refactor: Update mcp composer json by @mfortman11 in #9158
refactor: remove AsyncFileSink logger, add rotation support, and update docs by @XiaochuanLyu in #9105
refactor: Update Blank Flow Name by @deon-sanchez in #9089
refactor(tests): parameterize template tests and update timeout use by @ogabrielluiz in #9224
refactor: Improve cookie security and centralized utility by @Cristhianzl in #9240
refactor(core): implement centralized dynamic lazy import system for components by @ogabrielluiz in #8932
refactor(session): migrate to server-based session management and add tests by @edwinjosechittilappilly in #9077
refactor: Skip MCP Memory leak integration test by @edwinjosechittilappilly in #9358
refactor: remove Anthropic provider test by @edwinjosechittilappilly in #9369
refactor: Remove extraneous flag from package lock by @edwinjosechittilappilly in #9371
refactor: flowSidebarComponents folder structure refactor and add test coverage by @mfortman11 in #9383
refactor(docling): extract processing logic to separate worker process by @italojohnny in #9393
refactor: Update KnowledgeBaseEmptyState component text and structure by @deon-sanchez in #9456
refactor: Update MCP composer auth to just api and oauth by @mfortman11 in #9487
build: add .dockerignore and move docling from runtime to dev deps by @ogabrielluiz in #9469
build: add structlog dep to base package by @jordanrfrazier in #9516
refactor: Add create knowledge button by @deon-sanchez in #9520
build: add additional OCR dependencies for docling by @jordanrfrazier in #9156
build: update nv-ingest by @jordanrfrazier in #9478
refactor: Agent component enhancements for release v1.6 by @deon-sanchez in #9685
refactor: Padding misaligned for sidebar icons and other issues fix for 1.6 by @deon-sanchez in #9713
refactor: update skip_auth_auto_login behavior and update messaging timelines for removal by @jordanrfrazier in #9874
refactor: Improve modal management and UI consistency by @Cristhianzl in #9957

✅ Tests

test: Add 500ms timeout to starter-projects spec for timing reliability by @Cristhianzl in #9040
test: skip Everything server on Python 3.13 by @italojohnny in #9361
test: switch to settings-driven cached type API; relax assertions by @ogabrielluiz in #9518
test: Increase loading performance test timeout by @Cristhianzl in #9873

Others

chore: update pre-commit hooks to latest versions by @ogabrielluiz in #8938
chore: update pre-commit configuration to use local ruff hooks by @ogabrielluiz in #9048
deps: update langchain and langchain-community to support Perplexity by @italojohnny in #9166
ref: Update Ruff per-file ignores for tests and scripts by @edwinjosechittilappilly in #9206
ci: don't block CI when the nightly build fails by @epinzur in #9238
chore: fix frontend code coverage scoring by @epinzur in #9209
chore: fix the manual cross platform test run by @epinzur in #9252
chore: try again to fix the manual test run by @epinzur in #9253
chore: continue to debug manual cross-platform test by @epinzur in #9254
chore: potential fix for cross-platform test workflows by @epinzur in #9255
chore: simplfied cross-platform test logic by @epinzur in #9256
chore: more cross platform testing tweaks by @epinzur in #9258
chore: another fix attempt for the cross-platform tests by @epinzur in #9259
chore: continue to debug cross-platform test issues by @epinzur in #9260
chore:continue to debug cross-platform tests by @epinzur in #9261
chore: more cross-platform test debug by @epinzur in #9262
chore: debug nightly build by @epinzur in #9263
chore: more cross-platform debug by @epinzur in #9266
chore: continue cross-product debug by @epinzur in #9269
chore:more cross-platform test deubgging by @epinzur in #9270
ci: add checkout step to publish to pypi steps in nightly workflow by @jordanrfrazier in #9280
build(deps):(deps): bump autofix-ci/action from 551dded8c6cc8a1054039c8bc0b8b48c51dfc6ef to 635ffb0c9798bd160680f18fd73371e355b85f27 by @dependabot[bot] in #8807
build(deps):(deps): bump actions/github-script from 6 to 7 by @dependabot[bot] in #9288
build(deps):(deps): bump actions/setup-node from 3 to 4 by @dependabot[bot] in #9287
build(deps):(deps): bump astral-sh/setup-uv from 3 to 6 by @dependabot[bot] in #9286
build(deps):(deps): bump actions/setup-python from 4 to 5 by @dependabot[bot] in #9285
ref: Increase max file upload size to 1024 MB by @edwinjosechittilappilly in #9276
ref: MCP Tests by @edwinjosechittilappilly in #9349
chore: bump uv minimum version to 0.7.20 by @italojohnny in #9364
chore: pin uv version to 0.7.20 by @italojohnny in #9365
chore: skip mcp everything server test by @edwinjosechittilappilly in #9366
chore: bump langflow version by @edwinjosechittilappilly in #9402
chore: update schema version and format JSON structure in biome.json by @ogabrielluiz in #9289
docs: OpenAPI spec version upgraded from 1.5.0.post1 to 1.5.0.post2 by @github-actions[bot] in #9430
Initial document describing the Langflow release process. by @kerinin in #9500
ref: Refactor vectorstore components structure by @edwinjosechittilappilly in #9486
chore: Update version to 1.6.0 in package files by @ogabrielluiz in #9746
ref: update auto login behavior to use secure defaults by @jordanrfrazier in #9825

New Contributors

@epinzur made their first contribution in #9081
@XiaochuanLyu made their first contribution in #9105
@harjoben made their first contribution in #9231
@psy42a made their first contribution in #8204
@sunbingchuan made their first contribution in #9466
@arvy made their first contribution in #9278
@kerinin made their first contribution in #9500
@HzaRashid made their first contribution in #9436

Full Changelog: 1.5.1...1.6.0