diff --git a/.github/workflows/_compile_integration_test.yml b/.github/workflows/_compile_integration_test.yml
index 566a7ea000b..334da4d141f 100644
--- a/.github/workflows/_compile_integration_test.yml
+++ b/.github/workflows/_compile_integration_test.yml
@@ -27,7 +27,7 @@ jobs:
     timeout-minutes: 20
     name: 'Python ${{ inputs.python-version }}'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: '🐍 Set up Python ${{ inputs.python-version }} + UV'
         uses: "./.github/actions/uv_setup"
diff --git a/.github/workflows/_integration_test.yml b/.github/workflows/_integration_test.yml
index a1f7f988fa0..c5b2362a6ae 100644
--- a/.github/workflows/_integration_test.yml
+++ b/.github/workflows/_integration_test.yml
@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     name: 'Python ${{ inputs.python-version }}'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: '🐍 Set up Python ${{ inputs.python-version }} + UV'
         uses: "./.github/actions/uv_setup"
diff --git a/.github/workflows/_lint.yml b/.github/workflows/_lint.yml
index de83f80188b..dba94f9f44c 100644
--- a/.github/workflows/_lint.yml
+++ b/.github/workflows/_lint.yml
@@ -33,7 +33,7 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: '📋 Checkout Code'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: '🐍 Set up Python ${{ inputs.python-version }} + UV'
         uses: "./.github/actions/uv_setup"
diff --git a/.github/workflows/_release.yml b/.github/workflows/_release.yml
index 3679d207d57..e077e7b0e40 100644
--- a/.github/workflows/_release.yml
+++ b/.github/workflows/_release.yml
@@ -43,7 +43,7 @@ jobs:
       version: ${{ steps.check-version.outputs.version }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Python + uv
         uses: "./.github/actions/uv_setup"
@@ -92,7 +92,7 @@ jobs:
     outputs:
       release-body: ${{ steps.generate-release-body.outputs.release-body }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           repository: langchain-ai/langchain
           path: langchain
@@ -199,7 +199,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       # We explicitly *don't* set up caching here. This ensures our tests are
       # maximally sensitive to catching breakage.
@@ -362,7 +362,7 @@ jobs:
       AZURE_OPENAI_LLM_DEPLOYMENT_NAME: ${{ secrets.AZURE_OPENAI_LLM_DEPLOYMENT_NAME }}
       AZURE_OPENAI_EMBEDDINGS_DEPLOYMENT_NAME: ${{ secrets.AZURE_OPENAI_EMBEDDINGS_DEPLOYMENT_NAME }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       # We implement this conditional as Github Actions does not have good support
       # for conditionally needing steps. https://github.com/actions/runner/issues/491
@@ -440,7 +440,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Python + uv
         uses: "./.github/actions/uv_setup"
@@ -479,7 +479,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up Python + uv
         uses: "./.github/actions/uv_setup"
diff --git a/.github/workflows/_test.yml b/.github/workflows/_test.yml
index 2b26e6cfa51..dc48456b3ca 100644
--- a/.github/workflows/_test.yml
+++ b/.github/workflows/_test.yml
@@ -32,7 +32,7 @@ jobs:
     name: 'Python ${{ inputs.python-version }}'
     steps:
       - name: '📋 Checkout Code'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: '🐍 Set up Python ${{ inputs.python-version }} + UV'
         uses: "./.github/actions/uv_setup"
diff --git a/.github/workflows/_test_doc_imports.yml b/.github/workflows/_test_doc_imports.yml
index ebc95c77a76..5207a9ca227 100644
--- a/.github/workflows/_test_doc_imports.yml
+++ b/.github/workflows/_test_doc_imports.yml
@@ -21,7 +21,7 @@ jobs:
     name: '🔍 Check Doc Imports (Python ${{ inputs.python-version }})'
     steps:
       - name: '📋 Checkout Code'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: '🐍 Set up Python ${{ inputs.python-version }} + UV'
         uses: "./.github/actions/uv_setup"
diff --git a/.github/workflows/_test_pydantic.yml b/.github/workflows/_test_pydantic.yml
index 2e2b7cfe841..3a5f8d03ed7 100644
--- a/.github/workflows/_test_pydantic.yml
+++ b/.github/workflows/_test_pydantic.yml
@@ -34,7 +34,7 @@ jobs:
     name: 'Pydantic ~=${{ inputs.pydantic-version }}'
     steps:
       - name: '📋 Checkout Code'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: '🐍 Set up Python ${{ inputs.python-version }} + UV'
         uses: "./.github/actions/uv_setup"
diff --git a/.github/workflows/_test_release.yml b/.github/workflows/_test_release.yml
index 95ca2aaad8b..3c80c0e9c31 100644
--- a/.github/workflows/_test_release.yml
+++ b/.github/workflows/_test_release.yml
@@ -27,7 +27,7 @@ jobs:
       version: ${{ steps.check-version.outputs.version }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: '🐍 Set up Python + UV'
         uses: "./.github/actions/uv_setup"
@@ -83,7 +83,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - uses: actions/download-artifact@v5
         with:
diff --git a/.github/workflows/api_doc_build.yml b/.github/workflows/api_doc_build.yml
index e3eab91c962..3cd664a4beb 100644
--- a/.github/workflows/api_doc_build.yml
+++ b/.github/workflows/api_doc_build.yml
@@ -17,10 +17,10 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           path: langchain
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           repository: langchain-ai/langchain-api-docs-html
           path: langchain-api-docs-html
diff --git a/.github/workflows/check-broken-links.yml b/.github/workflows/check-broken-links.yml
index 22a3a22d618..6c949b5bbf8 100644
--- a/.github/workflows/check-broken-links.yml
+++ b/.github/workflows/check-broken-links.yml
@@ -13,7 +13,7 @@ jobs:
     if: github.repository_owner == 'langchain-ai' || github.event_name != 'schedule'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: '🟢 Setup Node.js 18.x'
         uses: actions/setup-node@v4
         with:
diff --git a/.github/workflows/check_core_versions.yml b/.github/workflows/check_core_versions.yml
index 477a4259b3a..7905bf06ce3 100644
--- a/.github/workflows/check_core_versions.yml
+++ b/.github/workflows/check_core_versions.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: '✅ Verify pyproject.toml & version.py Match'
         run: |
diff --git a/.github/workflows/check_diffs.yml b/.github/workflows/check_diffs.yml
index 0c81880442d..ced20078937 100644
--- a/.github/workflows/check_diffs.yml
+++ b/.github/workflows/check_diffs.yml
@@ -33,7 +33,7 @@ jobs:
     if: ${{ !contains(github.event.pull_request.labels.*.name, 'ci-ignore') }}
     steps:
       - name: '📋 Checkout Code'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: '🐍 Setup Python 3.11'
         uses: actions/setup-python@v5
         with:
@@ -138,7 +138,7 @@ jobs:
       run:
         working-directory: ${{ matrix.job-configs.working-directory }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: '🐍 Set up Python ${{ matrix.job-configs.python-version }} + UV'
         uses: "./.github/actions/uv_setup"
diff --git a/.github/workflows/check_new_docs.yml b/.github/workflows/check_new_docs.yml
index eab0156d1e8..1df3ac9f504 100644
--- a/.github/workflows/check_new_docs.yml
+++ b/.github/workflows/check_new_docs.yml
@@ -22,7 +22,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-python@v5
         with:
           python-version: '3.10'
diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
index 6d6025082df..089f019074d 100644
--- a/.github/workflows/codspeed.yml
+++ b/.github/workflows/codspeed.yml
@@ -36,7 +36,7 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       # We have to use 3.12 as 3.13 is not yet supported
       - name: '📦 Install UV Package Manager'
diff --git a/.github/workflows/people.yml b/.github/workflows/people.yml
index d47b4e73529..3347d61ff5e 100644
--- a/.github/workflows/people.yml
+++ b/.github/workflows/people.yml
@@ -19,7 +19,7 @@ jobs:
         env:
           GITHUB_CONTEXT: ${{ toJson(github) }}
         run: echo "$GITHUB_CONTEXT"
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       # Ref: https://github.com/actions/runner/issues/2033
       - name: '🔧 Fix Git Safe Directory in Container'
         run: mkdir -p /home/runner/work/_temp/_github_home && printf "[safe]\n\tdirectory = /github/workspace" > /home/runner/work/_temp/_github_home/.gitconfig
diff --git a/.github/workflows/run_notebooks.yml b/.github/workflows/run_notebooks.yml
index 8f5c194762a..e6d5def0c2c 100644
--- a/.github/workflows/run_notebooks.yml
+++ b/.github/workflows/run_notebooks.yml
@@ -26,7 +26,7 @@ jobs:
     if: github.repository == 'langchain-ai/langchain' || github.event_name != 'schedule'
     name: '📑 Test Documentation Notebooks'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: '🐍 Set up Python + UV'
         uses: "./.github/actions/uv_setup"
diff --git a/.github/workflows/scheduled_test.yml b/.github/workflows/scheduled_test.yml
index 62ed8699ddd..3501ba66523 100644
--- a/.github/workflows/scheduled_test.yml
+++ b/.github/workflows/scheduled_test.yml
@@ -68,14 +68,14 @@ jobs:
         working-directory: ${{ fromJSON(needs.compute-matrix.outputs.matrix).working-directory }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           path: langchain
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           repository: langchain-ai/langchain-google
           path: langchain-google
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           repository: langchain-ai/langchain-aws
           path: langchain-aws