LangChain Release Notes
111 release notes curated from 2 sources by the Releasebot Team. Last updated: May 23, 2026
LangChain Products
- May 22, 2026
- Date parsed from source:May 22, 2026
- First seen by Releasebot:May 23, 2026
langgraph-sdk==0.3.15
LangGraph releases a new SDK update with better cron search and count filtering, safer URL handling for caller-supplied identifiers, and refreshed package versions across the stack.
Changes since sdk==0.3.14
- release(checkpoint): 4.1.1 (#7890)
- release(sdk-py): 0.3.15 (#7891)
- fix(sdk-py): percent-encode caller-supplied identifiers in URL paths (#7893)
- release(langgraph): 1.2.1 (#7883)
- chore(deps): bump idna from 3.11 to 3.15 in /libs/sdk-py (#7863)
- chore(deps): bump urllib3 from 2.6.3 to 2.7.0 in /libs/sdk-py (#7764)
- chore(deps): bump langsmith from 0.7.31 to 0.8.0 in /libs/sdk-py (#7789)
- release: bump alpha packages to official versions (#7775)
- chore(langgraph): bump langchain-core to 1.4.0 (#7767)
- feat(sdk-py): support metadata filter for crons search/count (#7737)
- chore(deps): bump ty from 0.0.23 to 0.0.33 in /libs/sdk-py (#7666)
- May 22, 2026
- Date parsed from source:May 22, 2026
- First seen by Releasebot:May 23, 2026
langgraph-checkpoint==4.1.1
LangGraph fixes checkpoint envelope revival and updates checkpoint dependencies in 4.1.1.
Changes since checkpoint
release(checkpoint): 4.1.1 (#7890)
fix(checkpoint): restrict lc:2 envelope revival to default constructor (#7892)
chore(deps): bump idna from 3.11 to 3.15 in /libs/checkpoint (#7860)
chore(deps): bump langsmith from 0.7.31 to 0.8.0 in /libs/checkpoint (#7784)
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- May 21, 2026
- Date parsed from source:May 21, 2026
- First seen by Releasebot:May 22, 2026
langchain-tests==1.1.9
LangChain releases standard-tests 1.1.9 with looser streaming assertions and dependency updates.
Changes since langchain-tests==1.1.8
release(standard-tests): 1.1.9 (#37609)
test(standard-tests): allow extra content blocks in streaming assertions (#37592)
chore: bump idna from 3.11 to 3.15 in /libs/standard-tests (#37536)
chore: bump the minor-and-patch group across 3 directories with 15 updates (#37515)
ci(infra): harden Dependabot version-bound preservation (#37510)
Original source - May 21, 2026
- Date parsed from source:May 21, 2026
- First seen by Releasebot:May 22, 2026
langchain-openai==1.2.2
LangChain ships langchain-openai 1.2.2 with OpenAI partner fixes and test repairs, including audio chat and Azure embedding integration updates, httpx finalizer guards, better context size handling, refreshed model references, and documentation for the base_url fallback chain.
Changes since langchain-openai==1.2.1
release(openai): 1.2.2 (#37617)
Original source
chore(infra): bump langchain-tests floor to 1.1.9 (#37610)
test(openai): unbreak audio chat and Azure embedding integration tests (#37589)
fix(openai): guard httpx finalizers (#37570)
chore: bump langsmith from 0.8.4 to 0.8.5 in /libs/partners/openai (#37549)
chore: bump idna from 3.11 to 3.15 in /libs/partners/openai (#37548)
ci(infra): harden Dependabot version-bound preservation (#37510)
test(standard-tests): assert ls_model_name honors per-call model override (#37504)
fix(openai): source LLM context size from model profiles (#37489)
chore(core,langchain,openai): refresh stale OpenAI model references (#37487)
fix(openai): broaden condition for ContextOverflowError to accommodate other providers (#37457)
docs(openai): document base_url env var fallback chain (#37436)
chore: bump langsmith from 0.8.0 to 0.8.4 in /libs/partners/openai (#37416)
chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/partners/openai (#37398)
chore(infra): merge v1.4 into master (#37350)
chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/partners/openai (#37330)
chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/partners/openai (#37266)
chore(docs): update x handle references (#37081)
chore(model-profiles): refresh model profile data (#37074)
chore(docs): update comment for chatopenai (#37034)
chore(model-profiles): refresh model profile data (#37015) - May 21, 2026
- Date parsed from source:May 21, 2026
- First seen by Releasebot:May 22, 2026
langchain-fireworks==1.4.1
LangChain fixes Fireworks retries and stabilizes integration tests in a new langchain-fireworks 1.4.1 release.
Changes since langchain-fireworks==1.4.0
release(fireworks): 1.4.1 (#37603)
fix(fireworks): retry on bare APIConnectionError, default max_retries=2 (#37602)
test(fireworks): stabilize integration tests with rate limiting and retries (#37590)
Original source - May 21, 2026
- Date parsed from source:May 21, 2026
- First seen by Releasebot:May 22, 2026
langgraph==1.2.1
LangGraph ships 1.2.1 with opt-in before_builtins stream transformers and fixes to keep tool results out of v3 messages.
Changes since 1.2.0
release(langgraph): 1.2.1 (#7883)
feat(langgraph): add before_builtins opt-in for stream transformers (#7882)
chore(deps): bump idna from 3.11 to 3.15 in /libs/langgraph (#7866)
fix(langgraph): keep tool results out of v3 messages (#7838)
chore(deps): bump langsmith from 0.7.31 to 0.8.0 in /libs/langgraph (#7788)
Original source - May 20, 2026
- Date parsed from source:May 20, 2026
- First seen by Releasebot:May 22, 2026
langchain-fireworks==1.4.0
LangChain releases Fireworks 1.4.0 with a migration to the fireworks-ai 1.x SDK, refreshed model profile data, and a prompt-too-long fix that now raises ContextOverflowError. It also includes dependency and infrastructure updates for the Fireworks integration.
Changes since langchain-fireworks==1.3.1
- release(fireworks): 1.4.0 (#37582)
- feat(fireworks): migrate to fireworks-ai 1.x SDK (#37581)
- chore(model-profiles): refresh model profile data (#37574)
- chore: bump idna from 3.10 to 3.15 in /libs/partners/fireworks (#37527)
- ci(infra): harden Dependabot version-bound preservation (#37510)
- fix(fireworks): raise ContextOverflowError on prompt-too-long (#37458)
- chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/partners/fireworks (#37404)
- chore: bump requests from 2.33.1 to 2.34.0 in /libs/partners/fireworks (#37355)
- chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/partners/fireworks (#37339)
- chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/partners/fireworks (#37279)
- May 18, 2026
- Date parsed from source:May 18, 2026
- First seen by Releasebot:May 19, 2026
langchain-tests==1.1.8
LangChain releases standard-tests 1.1.8 with hotfixes, refreshed OpenAI model references, a test for per-call model overrides, and updated dependency bounds and lockfiles.
Changes since langchain-tests==1.1.7
- hotfix(standard-tests): set langchain-core version bounds (#37509)
- hotfix: bump lockfiles (#37508)
- release(standard-tests): 1.1.8 (#37507)
- test(standard-tests): assert ls_model_name honors per-call model override (#37504)
- chore(core,langchain,openai): refresh stale OpenAI model references (#37487)
- chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/standard-tests (#37381)
- chore(infra): merge v1.4 into master (#37350)
- chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/standard-tests (#37324)
- chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/standard-tests (#37253)
- chore: bump types-pyyaml from 6.0.12.20250915 to 6.0.12.20260408 in /libs/standard-tests (#37125)
- chore(docs): update x handle references (#37081)
- May 15, 2026
- Date parsed from source:May 15, 2026
- First seen by Releasebot:May 15, 2026
langchain==1.3.1
LangChain fixes Bedrock provider alias handling in summarization token checks in its 1.3.1 release.
Changes since langchain==1.3.0
release(langchain): 1.3.1 (#37454)
fix(langchain): alias Bedrock providers in summarization token check (#37453)
Original source - May 12, 2026
- Date parsed from source:May 12, 2026
- First seen by Releasebot:May 13, 2026
langchain==1.3.0
LangChain adds version v3 support for stream_events and astream_events in agents.
This release adds support for version="v3" in
Original sourcestream_events/astream_eventsfor langchain agents. Refer to the event streaming guide for details. - May 12, 2026
- Date parsed from source:May 12, 2026
- First seen by Releasebot:May 12, 2026
langgraph==1.2.0
LangGraph releases a new update with official package versions and key reliability upgrades, including durable error-handler resume across host crashes, a new set_node_defaults() option for StateGraph, and checkpoint and delta channel improvements.
Changes since 1.2.0a7
release: bump alpha packages to official versions (#7775)
feat(langgraph): durable error-handler resume across host crashes (#7773)
feat(langgraph): add set_node_defaults() to StateGraph (#7747)
chore(deps): bump urllib3 from 2.6.3 to 2.7.0 in /libs/langgraph (#7766)
chore(deps): bump mistune from 3.2.0 to 3.2.1 in /libs/langgraph (#7733)
chore(langgraph): bump langchain-core to 1.4.0 (#7767)
feat(checkpoint): force delta channel snapshot after max supersteps since last snapshot (#7746)
test(langgraph): de-flake heartbeat progress test (#7735)
chore(langgraph): re-implement exit mode for delta channel (#7730)
chore(deps): bump ty from 0.0.23 to 0.0.33 in /libs/sdk-py (#7666)
docs(checkpoint): mark DeltaChannel and delta-history APIs as beta (#7732)
chore(deps): bump jupyter-server from 2.17.0 to 2.18.0 in /libs/langgraph (#7713)
feat(checkpoint-sqlite): override get_delta_channel_history with streaming walk (#7702)
chore: "chore: minor clean up around checkpoint and delta channel" (#7706)
chore: minor clean up around checkpoint and delta channel (#7705)
Original source - May 12, 2026
- Date parsed from source:May 12, 2026
- First seen by Releasebot:May 12, 2026
langgraph-prebuilt==1.1.0
LangGraph ships alpha updates with official package versions, a new checkpoint-sqlite streaming walk override, and dependency bumps.
Changes since prebuilt==1.1.0a2
release: bump alpha packages to official versions (#7775)
chore(deps): bump urllib3 from 2.6.3 to 2.7.0 in /libs/prebuilt (#7763)
chore(langgraph): bump langchain-core to 1.4.0 (#7767)
chore(deps): bump ty from 0.0.23 to 0.0.33 in /libs/sdk-py (#7666)
feat(checkpoint-sqlite): override get_delta_channel_history with streaming walk (#7702)
chore(deps-dev): bump the minor-and-patch group across 1 directory with 3 updates (#7698)
release: alpha bump (a4) for langgraph, checkpoint, checkpoint-postgres (#7701)
release: alpha bump langgraph 1.2.0a6 (#7697)
Original source - May 12, 2026
- Date parsed from source:May 12, 2026
- First seen by Releasebot:May 12, 2026
langgraph-cli==0.4.26
LangGraph releases CLI 0.4.26 with prerelease API version support and dependency updates.
Changes since cli==0.4.25
release(cli): 0.4.26 (#7772)
fix(cli): add support for prerelease api_versions (#7771)
chore(deps): bump the uv group across 2 directories with 1 update (#7749)
chore(deps): bump urllib3 from 2.6.3 to 2.7.0 in /libs/cli (#7765)
chore(deps): bump langchain-core from 1.3.0 to 1.3.3 in /libs/cli (#7753)
Original source - May 12, 2026
- Date parsed from source:May 12, 2026
- First seen by Releasebot:May 12, 2026
langgraph-checkpoint-sqlite==3.1.0
LangGraph ships checkpoint-sqlite updates, bumps dependencies, removes a helper, and adds delta channel checkpointer conformance guidance.
Changes since checkpointsqlite==3.1.0a1
- release: bump alpha packages to official versions (#7775)
- chore(deps): bump urllib3 from 2.6.3 to 2.7.0 in /libs/checkpoint-sqlite (#7760)
- chore(deps): bump langchain-core from 1.2.28 to 1.3.3 in /libs/checkpoint-sqlite (#7751)
- chore: remove keepset helper (#7745)
- chore(langgraph): add guide/conformance for delta channel checkpointer (#7736)
- May 12, 2026
- Date parsed from source:May 12, 2026
- First seen by Releasebot:May 12, 2026
langgraph-checkpoint-postgres==3.1.0
LangGraph ships checkpoint-postgres updates with official package versions, dependency bumps, and a UNION ALL fix.
Changes since checkpointpostgres==3.1.0a4
- release: bump alpha packages to official versions (#7775)
- chore(deps): bump urllib3 from 2.6.3 to 2.7.0 in /libs/checkpoint-postgres (#7761)
- chore(deps): bump langchain-core from 1.3.2 to 1.3.3 in /libs/checkpoint-postgres (#7754)
- fix(checkpoint-postgres): add column aliases to seed-blob branch of delta stage-2 UNION ALL (#7728)
Curated by the Releasebot team
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