diff --git a/.github/workflows/gem-push.yml b/.github/workflows/gem-push.yml
index 366d42d4..d22f2c9f 100644
--- a/.github/workflows/gem-push.yml
+++ b/.github/workflows/gem-push.yml
@@ -7,13 +7,15 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
 
     steps:
       - uses: actions/checkout@v5
 
       - name: Release Gem
         if: contains(github.ref, 'refs/tags/v')
-        uses: cadwallion/publish-rubygems-action@master
+        uses: cadwallion/publish-rubygems-action@94a6f4cd5350581749c569b5001eecc864e3ad0b # v1.1.0
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
           RUBYGEMS_API_KEY: ${{secrets.RUBYGEMS_API_KEY}}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61ffda6c..1c30e519 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,14 +1,22 @@
 # Changelog
 
-## Unreleased
+## 5.1.0 — 2026-09-06
 
 ### Added
 
-* File search through `client.files.search`, including full-text, exact, metadata, tag, range, and image filters,
-  sorting, highlights, `include=appdata`, and POST-aware pagination
-* Per-file tags through `client.file_tags` with list, replace, and atomic add/delete operations
-* Upload-time `tags:` support for direct, batch, URL, and multipart uploads
-* The `tags` attribute on file resources returned by the REST API
+* Search files through `client.files.search` with full-text, UUID, exact, metadata, tag, range, and image filters,
+  sorting, highlights, `include=appdata`, and POST-aware pagination that preserves the original search options.
+* Manage per-file tags through `client.file_tags` with list, replace, and atomic add/delete operations.
+* Apply tags while uploading files directly, in batches, from URLs, or through multipart uploads.
+* Read tags from file resources returned by the REST API.
+* Call the raw REST file-search and file-tag endpoints through `client.api.rest` when exact endpoint parity is needed.
+
+## 5.0.1 — 2026-06-09
+
+### Fixed
+
+* Upload API requests now send the SDK-generated `User-Agent` instead of Faraday's default header.
+* Multipart upload part requests to presigned URLs now include the same SDK-generated `User-Agent`.
 
 ## 5.0.0 — 2026-05-17
 
diff --git a/MIGRATING_V5.md b/MIGRATING_V5.md
index 8cf594d6..6a7fea2d 100644
--- a/MIGRATING_V5.md
+++ b/MIGRATING_V5.md
@@ -27,7 +27,7 @@ The examples expect `UPLOADCARE_PUBLIC_KEY` and `UPLOADCARE_SECRET_KEY` to come
 ## Recommended Migration Order
 
 1. Introduce explicit `Uploadcare::Client` instances in your application.
-2. Move app-facing code to `client.files`, `client.groups`, `client.uploads`, `client.project`, `client.webhooks`, `client.file_metadata`, `client.addons`, and `client.conversions`.
+2. Move app-facing code to `client.files`, `client.groups`, `client.uploads`, `client.project`, `client.webhooks`, `client.file_metadata`, `client.file_tags`, `client.addons`, and `client.conversions`.
 3. Keep `client.api.rest` and `client.api.upload` only where you need raw endpoint parity.
 4. Audit return-type and error-handling assumptions.
 5. Remove any app code that depends on internal transport classes.
@@ -201,6 +201,7 @@ These top-level resource constants still exist:
 - `Uploadcare::Project`
 - `Uploadcare::Webhook`
 - `Uploadcare::FileMetadata`
+- `Uploadcare::FileTags`
 - `Uploadcare::DocumentConversion`
 - `Uploadcare::VideoConversion`
 
diff --git a/docs/release-notes-5.1.0.md b/docs/release-notes-5.1.0.md
new file mode 100644
index 00000000..4b34a8fa
--- /dev/null
+++ b/docs/release-notes-5.1.0.md
@@ -0,0 +1,33 @@
+# uploadcare-ruby 5.1.0
+
+This release adds file search and file-tag support to the v5 client API. It is backward compatible with 5.0.x and
+does not require an application migration.
+
+## Highlights
+
+- Search files through `client.files.search` using text, UUID, metadata, tag, range, and image filters.
+- Sort search results, inspect match highlights, request `appdata`, and paginate without rebuilding POST criteria.
+- List, replace, add, and delete per-file tags through `client.file_tags`.
+- Assign tags during direct, batch, URL, and multipart uploads.
+- Read tags directly from returned file resources.
+- Use `client.api.rest.files.search` and `client.api.rest.file_tags` for exact REST endpoint access.
+
+## Upgrade Notes
+
+- Requirement: Ruby `>= 3.3`.
+- Update with `bundle update uploadcare-ruby` and run the application's test suite.
+- No configuration or data migration is required from 5.0.x.
+- File search results may be eventually consistent immediately after an upload; retry when a workflow searches for a
+  file it just created.
+- Existing upload calls remain valid. Pass `tags: [...]` only where upload-time tagging is needed.
+- Rollback: pin `uploadcare-ruby` to `5.0.1`.
+
+## Examples
+
+- File search: [`examples/file_search.rb`](../examples/file_search.rb)
+- File tags: [`examples/file_tags.rb`](../examples/file_tags.rb)
+- Raw REST examples: [`api_examples/README.md`](../api_examples/README.md)
+
+## Full Changelog
+
+See [CHANGELOG.md](../CHANGELOG.md).
diff --git a/lib/uploadcare/internal/user_agent.rb b/lib/uploadcare/internal/user_agent.rb
index cb9b1014..c1326d94 100644
--- a/lib/uploadcare/internal/user_agent.rb
+++ b/lib/uploadcare/internal/user_agent.rb
@@ -7,7 +7,7 @@
 #
 # @example
 #   Uploadcare::Internal::UserAgent.call(config: config)
-#   # => "UploadcareRuby/5.0.0/demopublickey (Ruby/3.3.0)"
+#   # => "UploadcareRuby/5.1.0/demopublickey (Ruby/3.3.0)"
 class Uploadcare::Internal::UserAgent
   # Build a User-Agent string.
   #
diff --git a/lib/uploadcare/version.rb b/lib/uploadcare/version.rb
index 058834c4..0d1a9295 100644
--- a/lib/uploadcare/version.rb
+++ b/lib/uploadcare/version.rb
@@ -3,5 +3,5 @@
 # Root namespace for the Uploadcare Ruby SDK.
 module Uploadcare
   # Gem version.
-  VERSION = '5.0.0'
+  VERSION = '5.1.0'
 end
diff --git a/spec/uploadcare/version_spec.rb b/spec/uploadcare/version_spec.rb
index f0518adb..4c0457b2 100644
--- a/spec/uploadcare/version_spec.rb
+++ b/spec/uploadcare/version_spec.rb
@@ -2,6 +2,6 @@
 
 RSpec.describe Uploadcare::VERSION do
   it 'has a version number' do
-    expect(Uploadcare::VERSION).to eq('5.0.0')
+    expect(Uploadcare::VERSION).to eq('5.1.0')
   end
 end