diff --git a/.github/workflows/links.yml b/.github/workflows/links.yml
new file mode 100644
index 0000000..5e3255b
--- /dev/null
+++ b/.github/workflows/links.yml
@@ -0,0 +1,32 @@
+name: Links
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "0 13 * * 1" # weekly, to catch external link rot without a commit
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Setup mise
+        uses: jdx/mise-action@6d1e696aa24c1aa1bcc1adea0212707c71ab78a8 # v3.6.1
+        with:
+          install: false
+
+      # Install only lychee (not the repo's full toolchain) and run the check.
+      - name: Check links
+        env:
+          MISE_AUTO_INSTALL: "false"
+        run: |
+          mise install lychee
+          mise run check-links
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4bab250..90e48f7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -36,4 +36,4 @@ jobs:
 
       # zizmor complains that 'v1' is a ref that can be provided by both the branch and tag namespaces.
       # specify that we want the v1 branch.
-      - uses: rubygems/release-gem@6317d8d1f7e28c24d28f6eff169ea854948bd9f7 # 1.2.0
+      - uses: rubygems/release-gem@6317d8d1f7e28c24d28f6eff169ea854948bd9f7 # v1.2.0
diff --git a/.gitignore b/.gitignore
index 831f7f9..9bf75a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,6 +21,9 @@
 # RuboCop cache
 /.rubocop-*
 
+# Lychee link checker cache
+.lycheecache
+
 # IDE/Editor specific
 /.idea
 /.vscode
diff --git a/CLAUDE.md b/CLAUDE.md
index 3d4ed6d..954fc14 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -385,6 +385,6 @@ ruby -Ilib:test test/test_reader.rb
 ## Additional Resources
 
 - [API Documentation](https://www.rubydoc.info/gems/maxmind-geoip2)
-- [GeoIP Web Services Docs](https://dev.maxmind.com/geoip/docs/web-services)
+- [GeoIP Web Services Docs](https://dev.maxmind.com/geoip/docs/web-services/)
 - [MaxMind DB Format](https://maxmind.github.io/MaxMind-DB/)
 - GitHub Issues: https://github.com/maxmind/GeoIP2-ruby/issues
diff --git a/README.md b/README.md
index 4c98ffb..a443ab1 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,8 @@
 ## Description
 
 This is the Ruby API for the GeoIP and GeoLite
-[webservices](https://dev.maxmind.com/geoip/docs/web-services?lang=en)
-and [databases](https://dev.maxmind.com/geoip/docs/databases?lang=en).
+[webservices](https://dev.maxmind.com/geoip/docs/web-services/?lang=en)
+and [databases](https://dev.maxmind.com/geoip/docs/databases/?lang=en).
 
 ## Installation
 
@@ -300,7 +300,7 @@ point may offer a particular piece of data, MaxMind does not always have
 every piece of data for any given IP address.
 
 See the [GeoIP web service
-documentation](https://dev.maxmind.com/geoip/docs/web-services?lang=en) for details on
+documentation](https://dev.maxmind.com/geoip/docs/web-services/?lang=en) for details on
 what data each end point may return.
 
 The only piece of data which is always returned is the `ip_address`
@@ -324,7 +324,7 @@ GeoNames premium data set.
 ## Reporting data problems
 
 If the problem you find is that an IP address is incorrectly mapped, please
-[submit your correction to MaxMind](https://www.maxmind.com/en/correction).
+[submit your correction to MaxMind](https://www.maxmind.com/en/geoip-data-correction-request).
 
 If you find some other sort of mistake, like an incorrect spelling, please
 check the [GeoNames site](https://www.geonames.org/) first. Once you've
@@ -335,7 +335,7 @@ will be automatically incorporated into future MaxMind releases.
 
 If you are a paying MaxMind customer and you're not sure where to submit a
 correction, please [contact MaxMind
-support](https://www.maxmind.com/en/support) for help.
+support](https://support.maxmind.com/knowledge-base) for help.
 
 ## Support
 
@@ -343,7 +343,7 @@ Please report all issues with this code using the [GitHub issue
 tracker](https://github.com/maxmind/GeoIP2-ruby/issues).
 
 If you are having an issue with a MaxMind service that is not specific to the
-client API, please see [our support page](https://www.maxmind.com/en/support).
+client API, please see [our support page](https://support.maxmind.com/knowledge-base).
 
 ## Requirements
 
diff --git a/lib/maxmind/geoip2/client.rb b/lib/maxmind/geoip2/client.rb
index addd92d..ce24938 100644
--- a/lib/maxmind/geoip2/client.rb
+++ b/lib/maxmind/geoip2/client.rb
@@ -13,7 +13,7 @@
 module MaxMind
   module GeoIP2
     # This class provides a client API for all the
-    # {https://dev.maxmind.com/geoip/docs/web-services?lang=en GeoIP web
+    # {https://dev.maxmind.com/geoip/docs/web-services/?lang=en GeoIP web
     # services}. The services are Country, City Plus, and Insights. Each service
     # returns a different set of data about an IP address, with Country returning
     # the least data and Insights the most.
diff --git a/lib/maxmind/geoip2/model/city.rb b/lib/maxmind/geoip2/model/city.rb
index 7439b45..6125cd1 100644
--- a/lib/maxmind/geoip2/model/city.rb
+++ b/lib/maxmind/geoip2/model/city.rb
@@ -12,7 +12,7 @@ module Model
       # Model class for the data returned by the GeoIP City Plus web service
       # and the City database. It is also used for GeoLite City lookups.
       #
-      # See https://dev.maxmind.com/geoip/docs/web-services?lang=en for more
+      # See https://dev.maxmind.com/geoip/docs/web-services/?lang=en for more
       # details.
       #
       # See {MaxMind::GeoIP2::Model::Country} for inherited methods.
diff --git a/lib/maxmind/geoip2/model/enterprise.rb b/lib/maxmind/geoip2/model/enterprise.rb
index 07a2a52..e4aba0d 100644
--- a/lib/maxmind/geoip2/model/enterprise.rb
+++ b/lib/maxmind/geoip2/model/enterprise.rb
@@ -7,7 +7,7 @@ module GeoIP2
     module Model
       # Model class for the data returned by GeoIP Enterprise database lookups.
       #
-      # See https://dev.maxmind.com/geoip/docs/web-services?lang=en for more
+      # See https://dev.maxmind.com/geoip/docs/web-services/?lang=en for more
       # details.
       #
       # See {MaxMind::GeoIP2::Model::City} for inherited methods.
diff --git a/lib/maxmind/geoip2/model/insights.rb b/lib/maxmind/geoip2/model/insights.rb
index 0760e67..b1989bd 100644
--- a/lib/maxmind/geoip2/model/insights.rb
+++ b/lib/maxmind/geoip2/model/insights.rb
@@ -8,7 +8,7 @@ module GeoIP2
     module Model
       # Model class for the data returned by the GeoIP Insights web service.
       #
-      # See https://dev.maxmind.com/geoip/docs/web-services?lang=en for more
+      # See https://dev.maxmind.com/geoip/docs/web-services/?lang=en for more
       # details.
       class Insights < City
         # Data indicating whether the IP address is part of an anonymizing
diff --git a/lychee.toml b/lychee.toml
new file mode 100644
index 0000000..0367419
--- /dev/null
+++ b/lychee.toml
@@ -0,0 +1,61 @@
+# Lychee link checker configuration
+# https://lychee.cli.rs/#/usage/config
+#
+# Run locally with:
+#   lychee './**/*.md' './lib/**/*.rb' './*.gemspec'
+
+# Include URL fragments in checks
+include_fragments = true
+
+# Don't allow any redirects, so links that have moved are surfaced and can be
+# updated to their canonical destination.
+max_redirects = 0
+
+# Accept these HTTP status codes
+# 100-103: Informational responses
+# 200-299: Success responses
+# 403: Forbidden (some sites use this for rate limiting)
+# 429: Too Many Requests
+# 500-599: Server errors (temporary issues shouldn't fail CI)
+# 999: LinkedIn's custom status code
+accept = ["100..=103", "200..=299", "403", "429", "500..=599", "999"]
+
+# Exclude URL patterns from checking (treated as regular expressions)
+exclude = [
+    # GitHub blob URLs with line-number fragments (not parseable as page anchors)
+    '^https://github\.com/[^/]+/[^/]+/blob/[0-9a-fA-F]+/.+#L\d+$',
+    # Live / auth-gated MaxMind endpoints: appear as code string literals or
+    # require login, so they can't be verified by an anonymous request.
+    '^https://geoip\.maxmind\.com',
+    '^https://geolite\.info',
+    '^https://minfraud\.maxmind\.com',
+    '^https://sandbox\.maxmind\.com',
+    '^https://updates\.maxmind\.com',
+    '^https://www\.maxmind\.com/en/accounts/',
+    '^https://www\.maxmind\.com/en/account/login',
+    # Local / placeholder URLs (e.g. the proxy example in docstrings)
+    '^file://',
+    '^https?://example\.(com|org|net)',
+    '^http://localhost',
+    '127\.0\.0\.1',
+]
+
+# Exclude file paths from getting checked (regular expressions, matched against
+# the path relative to the working directory). Patterns are segment-anchored
+# with (^|/) so short names like "build" don't match unintended paths.
+exclude_path = [
+    '(^|/)vendor/',
+    '(^|/)pkg/',
+    '(^|/)doc/',
+    '(^|/)\.yardoc/',
+    '(^|/)coverage/',
+    # Changelog: historical entries are preserved as-is, not rewritten
+    '(^|/)CHANGELOG\.md$',
+]
+
+# Cache results for 1 day to speed up repeated checks
+cache = true
+max_cache_age = "1d"
+
+# Skip missing input files instead of erroring
+skip_missing = true
diff --git a/mise.lock b/mise.lock
index 20b29f4..7b919bb 100644
--- a/mise.lock
+++ b/mise.lock
@@ -1,5 +1,33 @@
 # @generated - this file is auto-generated by `mise lock` https://mise.jdx.dev/dev-tools/mise-lock.html
 
+[[tools.lychee]]
+version = "0.23.0"
+backend = "aqua:lycheeverse/lychee"
+
+[tools.lychee."platforms.linux-arm64"]
+checksum = "sha256:97eb93b02a7d78a752fc33e5b0983439ccaadbf3db952b68a0a4401acd92e6e0"
+url = "https://github.com/lycheeverse/lychee/releases/download/lychee-v0.23.0/lychee-aarch64-unknown-linux-gnu.tar.gz"
+
+[tools.lychee."platforms.linux-arm64-musl"]
+checksum = "sha256:97eb93b02a7d78a752fc33e5b0983439ccaadbf3db952b68a0a4401acd92e6e0"
+url = "https://github.com/lycheeverse/lychee/releases/download/lychee-v0.23.0/lychee-aarch64-unknown-linux-gnu.tar.gz"
+
+[tools.lychee."platforms.linux-x64"]
+checksum = "sha256:5538440d2c69a45a0a09983271e5dee0c2fe7137d8035d25b2632e10a66a090a"
+url = "https://github.com/lycheeverse/lychee/releases/download/lychee-v0.23.0/lychee-x86_64-unknown-linux-musl.tar.gz"
+
+[tools.lychee."platforms.linux-x64-musl"]
+checksum = "sha256:5538440d2c69a45a0a09983271e5dee0c2fe7137d8035d25b2632e10a66a090a"
+url = "https://github.com/lycheeverse/lychee/releases/download/lychee-v0.23.0/lychee-x86_64-unknown-linux-musl.tar.gz"
+
+[tools.lychee."platforms.macos-arm64"]
+checksum = "sha256:4c8034900e11083b68ac6f6582c377ff1f704e268991999e09d717973e493e7f"
+url = "https://github.com/lycheeverse/lychee/releases/download/lychee-v0.23.0/lychee-arm64-macos.dmg"
+
+[tools.lychee."platforms.windows-x64"]
+checksum = "sha256:0fda7ff0a60c0250939fc25361c2d4e6e7853c31c996733fdd5a1dd760bcb824"
+url = "https://github.com/lycheeverse/lychee/releases/download/lychee-v0.23.0/lychee-x86_64-windows.exe"
+
 [[tools.ruby]]
 version = "4.0.5"
 backend = "core:ruby"
diff --git a/mise.toml b/mise.toml
index bea4666..531755b 100644
--- a/mise.toml
+++ b/mise.toml
@@ -8,6 +8,7 @@ disable_backends = [
 
 [tools]
 ruby = "latest"
+lychee = "latest"
 
 [hooks]
 enter = "mise install --quiet --locked"
@@ -15,3 +16,7 @@ enter = "mise install --quiet --locked"
 [[watch_files]]
 patterns = ["mise.toml", "mise.lock"]
 run = "mise install --quiet --locked"
+
+[tasks.check-links]
+description = "Check links with lychee"
+run = "lychee --no-progress './**/*.md' './lib/**/*.rb' './*.gemspec'"