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LangChain.js releases from GitHub
StackPulse watches LangChain.js release notes and keeps the original source link close to every summary.
#stacks/langchainjs/ai
LangChain.js release notes, breaking changes, and upgrade notes.
Build context-aware reasoning applications in JavaScript StackPulse turns upstream changelogs into scannable summaries with risky changes, deprecations, migration notes, and source links.
releases
20
breaking
0
security
0
deprecated
0
migrations
3
upgrade risk
Breaking changes and deprecations
Risky changes are separated from normal feature notes so you can scan upgrade impact before changing production dependencies.
migration notes
Source-backed next steps
Migration steps and recommended actions are only shown when the upstream release notes support them.
# latest_releases
source-backedlangchain@1.5.2lowfeatureJun 23, 2026
langchain@1.5.2
This patch release fixes an issue with decoupling strict tools from strict structured output responses in the OpenAI integration.
affected
Users relying on strict tools and structured output responses in the OpenAI integration may be affected.
action
Update to this version if you encounter issues with strict tools and structured output responses.
@langchain/openrouter@0.4.3lowJun 23, 2026
@langchain/openrouter@0.4.3
This patch release updates internal dependencies to the latest versions.
view source on github->@langchain/xai@1.4.3lowmigrationJun 23, 2026
@langchain/xai@1.4.3
This patch release updates the dependency on @langchain/openai to version 1.5.3.
view source on github->@langchain/openai@1.5.3lowfeatureJun 23, 2026
@langchain/openai@1.5.3
This patch release fixes an issue with strict tools being incorrectly coupled with strict structured output responses.
affected
Users relying on strict tools and strict structured output responses may be affected.
action
Update to this version if you use strict tools and structured output responses.
@langchain/together-ai@0.2.3lowmigrationJun 23, 2026
@langchain/together-ai@0.2.3
This patch updates dependencies, specifically upgrading @langchain/openai to version 1.5.3.
view source on github->@langchain/openrouter@0.4.2mediumfeatureJun 22, 2026
@langchain/openrouter@0.4.2
Patch release that fixes error handling for provider rate limits (429 errors) before retrying, along with dependency updates.
affected
Users experiencing rate limits from providers may see improved error handling behavior.
@langchain/openai@1.5.2mediumfeatureJun 22, 2026
@langchain/openai@1.5.2
This patch release fixes several issues related to OpenAI API integration, including handling of empty fields in Responses API input and proper routing of URL file blocks.
affected
Users leveraging OpenAI's Responses API through LangChain.js may have encountered errors with empty fields or incorrect content arrays; this release resolves those issues.
action
Update to version 1.5.2 to ensure compatibility with OpenAI's API requirements and avoid potential errors.
@langchain/xai@1.4.2lowJun 22, 2026
@langchain/xai@1.4.2
This release includes updates to dependencies without adding new features or breaking changes.
view source on github->@langchain/together-ai@0.2.2lowJun 22, 2026
@langchain/together-ai@0.2.2
This release includes dependency updates with no new features or breaking changes mentioned.
view source on github->langchain@1.5.1mediumfeatureJun 22, 2026
langchain@1.5.1
Fixed an issue where tool interrupts caused unhandled rejections in HITL runs.
affected
Users relying on interrupt functionality in HITL runs are affected.
action
Upgrade to version 1.5.1 to avoid crashes from unhandled rejections.
langchain@1.5.0mediumfeatureJun 18, 2026
langchain@1.5.0
This release introduces subagent support in the agent stream transformer, allowing v3 runs to expose named nested agents with detailed run information.
affected
Users working with agent tools and subagents will benefit from enhanced run information.
action
Consider updating agent implementations to utilize the new subagent stream transformer.
release_signals
+Added native subagent stream transformer to expose named nested agents in v3 runs
@langchain/openai@1.5.1lowfeatureJun 18, 2026
@langchain/openai@1.5.1
This release focuses on improving error handling for the Responses API stream iteration by wrapping errors with the existing OpenAI client error handling.
affected
Users utilizing the Responses API stream iteration in the OpenAI client may experience improved error handling.
@langchain/together-ai@0.2.1lowJun 18, 2026
@langchain/xai@1.4.1lowJun 18, 2026
@langchain/xai@1.4.1
This release primarily updates dependencies, including a patch to @langchain/openai@1.5.1.
affected
Users relying on @langchain/openai dependencies may be affected by the update.
action
Ensure compatibility with @langchain/openai@1.5.1 if used in your project.
@langchain/openrouter@0.4.1lowmigrationJun 18, 2026
@langchain/openrouter@0.4.1
This release primarily updates dependencies, specifically upgrading `@langchain/openai` to version 1.5.1.
affected
Users relying on `@langchain/openrouter` may need to ensure compatibility with the updated `@langchain/openai` dependency.
action
Review the changes in `@langchain/openai@1.5.1` to ensure compatibility.
@langchain/xai@1.4.0mediumfeatureJun 17, 2026
@langchain/xai@1.4.0
This release adds native completions and response stream events functionality.
affected
Users who need streaming event functionality in completions and responses will benefit from this update.
release_signals
+Added native completions and responses streamEvents events
@langchain/perplexity@0.3.0mediumfeatureJun 17, 2026
@langchain/perplexity@0.3.0
Added native completions streamEvents events to the perplexity integration.
affected
Users of the perplexity integration who need streaming events will benefit from this update.
action
Update to version 0.3.0 to utilize the new streaming events feature.
release_signals
+Added native completions streamEvents events
@langchain/together-ai@0.2.0mediumfeatureJun 17, 2026
@langchain/together-ai@0.2.0
Added native OpenAI-compatible streamEvents support and updated dependencies.
affected
Users utilizing streaming features with Together AI will benefit from enhanced compatibility.
action
Update to this version if you require native OpenAI-compatible streaming events.
release_signals
+Enable native OpenAI-compatible streamEvents events for better streaming compatibility
@langchain/openrouter@0.4.0mediumfeatureJun 17, 2026
@langchain/openrouter@0.4.0
Added native streamEvents event conversion for OpenRouter and updated dependencies.
affected
Users of OpenRouter streaming events may need to update their code to use the new native conversion.
action
Update to version 0.4.0 to take advantage of the new streamEvents feature.
release_signals
+Added native streamEvents event conversion for OpenRouter
langchain@1.4.6mediumfeatureJun 17, 2026
langchain@1.4.6
Added dynamic interrupt skipping for human-in-the-loop middleware and introduced prompt caching middleware for AWS Bedrock.
affected
Developers using human-in-the-loop middleware or AWS Bedrock may want to update to access new features.
action
Update to version 1.4.6 to utilize the new middleware features.
release_signals
+Added `when` predicate to human-in-the-loop middleware for dynamic interrupt skipping
+Added bedrockPromptCachingMiddleware for AWS Bedrock prompt caching