diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e20373ec02..bdec4d1c9d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -194,7 +194,7 @@ jobs:
       UPDATE_TO: yt-dlp/yt-dlp@2025.09.05
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0  # Needed for changelog
 
@@ -255,7 +255,7 @@ jobs:
       SKIP_ONEFILE_BUILD: ${{ (!matrix.onefile && '1') || '' }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Cache requirements
         if: matrix.cache_requirements
@@ -318,7 +318,7 @@ jobs:
       UPDATE_TO: yt-dlp/yt-dlp@2025.09.05
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       # NB: Building universal2 does not work with python from actions/setup-python
 
       - name: Cache requirements
@@ -448,7 +448,7 @@ jobs:
       PYI_WHEEL: pyinstaller-${{ matrix.pyi_version }}-py3-none-${{ matrix.platform_tag }}.whl
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python_version }}
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 910c409efc..6d4dbdf193 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -29,7 +29,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/core.yml b/.github/workflows/core.yml
index d76495a25d..d196f59d83 100644
--- a/.github/workflows/core.yml
+++ b/.github/workflows/core.yml
@@ -53,7 +53,7 @@ jobs:
         - os: windows-latest
           python-version: pypy-3.11
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:
diff --git a/.github/workflows/download.yml b/.github/workflows/download.yml
index e5debc786d..8163bd1a23 100644
--- a/.github/workflows/download.yml
+++ b/.github/workflows/download.yml
@@ -9,7 +9,7 @@ jobs:
     if: "contains(github.event.head_commit.message, 'ci run dl')"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Python
       uses: actions/setup-python@v6
       with:
@@ -36,7 +36,7 @@ jobs:
         - os: windows-latest
           python-version: pypy-3.11
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:
diff --git a/.github/workflows/quick-test.yml b/.github/workflows/quick-test.yml
index 307559b96c..c26628b421 100644
--- a/.github/workflows/quick-test.yml
+++ b/.github/workflows/quick-test.yml
@@ -9,7 +9,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'ci skip all')"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Python 3.10
       uses: actions/setup-python@v6
       with:
@@ -26,7 +26,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'ci skip all')"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: actions/setup-python@v6
       with:
         python-version: '3.10'
diff --git a/.github/workflows/release-nightly.yml b/.github/workflows/release-nightly.yml
index 13cce8c33f..fd7cf4cbae 100644
--- a/.github/workflows/release-nightly.yml
+++ b/.github/workflows/release-nightly.yml
@@ -12,7 +12,7 @@ jobs:
     outputs:
       commit: ${{ steps.check_for_new_commits.outputs.commit }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - name: Check for new commits
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 52c61808fc..6bb429f269 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -75,7 +75,7 @@ jobs:
       head_sha: ${{ steps.get_target.outputs.head_sha }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
 
@@ -170,7 +170,7 @@ jobs:
       id-token: write  # mandatory for trusted publishing
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - uses: actions/setup-python@v6
@@ -233,7 +233,7 @@ jobs:
       VERSION: ${{ needs.prepare.outputs.version }}
       HEAD_SHA: ${{ needs.prepare.outputs.head_sha }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - uses: actions/download-artifact@v4
diff --git a/.github/workflows/signature-tests.yml b/.github/workflows/signature-tests.yml
index 8d48dff669..77f5e6a4c8 100644
--- a/.github/workflows/signature-tests.yml
+++ b/.github/workflows/signature-tests.yml
@@ -27,7 +27,7 @@ jobs:
         os: [ubuntu-latest, windows-latest]
         python-version: ['3.10', '3.11', '3.12', '3.13', '3.14', pypy-3.11]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:
diff --git a/.github/workflows/test-workflows.yml b/.github/workflows/test-workflows.yml
index 684ec6cc44..6c993e6b34 100644
--- a/.github/workflows/test-workflows.yml
+++ b/.github/workflows/test-workflows.yml
@@ -26,7 +26,7 @@ jobs:
     name: Check workflows
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-python@v6
         with:
           python-version: "3.10"  # Keep this in sync with release.yml's prepare job
diff --git a/devscripts/changelog_override.json b/devscripts/changelog_override.json
index 618e7fe6fe..bd78058e1e 100644
--- a/devscripts/changelog_override.json
+++ b/devscripts/changelog_override.json
@@ -298,5 +298,10 @@
         "action": "add",
         "when": "08d78996831bd8e1e3c2592d740c3def00bbf548",
         "short": "[priority] **Several options have been deprecated**\nIn order to simplify the codebase and reduce maintenance burden, various options have been deprecated. Please remove them from your commands/configurations. [Read more](https://github.com/yt-dlp/yt-dlp/issues/14198)"
+    },
+    {
+        "action": "add",
+        "when": "4e6a693057cfaf1ce1f07b019ed3bfce2bf936f6",
+        "short": "[priority] **The minimum *required* Python version has been raised to 3.10**\nPython 3.9 has reached its end-of-life as of October 2025, and yt-dlp has now removed support for it. [Read more](https://github.com/yt-dlp/yt-dlp/issues/13858)"
     }
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 36a579fddb..0dabe2ea14 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -75,7 +75,7 @@ dev = [
 ]
 static-analysis = [
     "autopep8~=2.0",
-    "ruff~=0.13.0",
+    "ruff~=0.14.0",
 ]
 test = [
     "pytest~=8.1",
diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index 2e36319dd8..ef42ba68e3 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -4112,7 +4112,7 @@ def cookiejar(self):
                 self.params.get('cookiefile'), self.params.get('cookiesfrombrowser'), self)
         except CookieLoadError as error:
             cause = error.__context__
-            self.report_error(str(cause), tb=''.join(traceback.format_exception(None, cause, cause.__traceback__)))
+            self.report_error(str(cause), tb=''.join(traceback.format_exception(cause)))
             raise
 
     @property
diff --git a/yt_dlp/utils/_utils.py b/yt_dlp/utils/_utils.py
index e5268deff9..2779d3043d 100644
--- a/yt_dlp/utils/_utils.py
+++ b/yt_dlp/utils/_utils.py
@@ -2402,6 +2402,7 @@ class PlaylistEntries:
 
     def __init__(self, ydl, info_dict):
         self.ydl = ydl
+
         # _entries must be assigned now since infodict can change during iteration
         entries = info_dict.get('entries')
         if entries is None: