diff --git a/src/psrt_ghsa_bot/app.py b/src/psrt_ghsa_bot/app.py
index fa58fbe..7c7f248 100644
--- a/src/psrt_ghsa_bot/app.py
+++ b/src/psrt_ghsa_bot/app.py
@@ -3,15 +3,17 @@
 import base64
 import csv
 import datetime
+import json
 import os
 import re
 import typing
+import urllib.parse
 
 import urllib3
 from cvelib.cve_api import CveApi
 from dotenv import load_dotenv
 from githubkit import AppAuthStrategy, GitHub
-from githubkit.exception import RequestFailed
+from githubkit.exception import RequestFailed, RequestError
 
 load_dotenv()
 
@@ -56,19 +58,48 @@ def get_repository_advisories(
     repo: str,
 ) -> typing.Iterable[dict[str, typing.Any]]:
     """Lists repository security advisories using the REST API."""
-    from githubkit.exception import RequestFailed
-    import json
 
     try:
-        # Use direct request instead of paginate to avoid validation issues
+        # We can't use the GitHubKit pagination helper because
+        # of Pydantic validation issues. We manually paginate instead.
         response = github.rest.security_advisories.list_repository_advisories(
             owner=owner,
             repo=repo,
+            per_page=100,
         )
-        # Parse JSON directly to bypass Pydantic validation
-        advisories = json.loads(response.content)
-        for advisory in advisories:
-            yield advisory
+        next_url = None
+        while True:
+            # Parse JSON directly to bypass Pydantic validation
+            advisories = json.loads(response.content)
+            for advisory in advisories:
+                yield advisory
+
+            # Find the 'Next' URL for pagination. If the
+            # URL exists we need to use this URL as the
+            # 'list_security_advisories()' URL is completely
+            # different to the 'Next' URL and the GitHub API blows up
+            # if we pass '?after=...' as a parameter to
+            # 'list_security_advisories()' :shrug:
+            link_header = response.headers.get("Link", "")
+            if mat := re.search(r'<([^>]+)>; rel="next"', link_header):
+                next_url = mat.group(1)
+            if not next_url:
+                break
+
+            # To avoid double-percent-quoting the 'after' parameter in
+            # our request we unquote the value first before
+            # sending it back into an HTTP client.
+            after = urllib.parse.unquote(re.search(r"after=([^&]+)", next_url).group(1))
+            # Remove params, we add them back in the request.
+            next_url = next_url.split("?", 1)[0]
+
+            response = github_client_request(
+                client=github.rest.security_advisories,
+                method="GET",
+                url=next_url,
+                params={"per_page": 100, "after": after},
+            )
+            next_url = None  # Reset for next loop.
     except RequestFailed as e:
         # 404 means no advisories or no access - that's okay
         if e.response.status_code == 404:
@@ -76,6 +107,21 @@ def get_repository_advisories(
         raise
 
 
+def github_client_request(client: typing.Any, method: str, url: str, params: dict[str, str | int]) -> typing.Any:
+    """Sends a raw HTTP request using a GitHub API client"""
+    headers = {"X-GitHub-Api-Version": client._REST_API_VERSION}
+    return client._github.request(
+        method,
+        url,
+        params=params,
+        headers=headers,
+        error_models={
+            "400": RequestError,
+            "404": RequestError,
+        },
+    )
+
+
 def reserve_one_cve(cve_api: CveApi) -> str:
     """Reserves a single CVE ID"""
     resp = cve_api.reserve(count=1, random=True, year=str(datetime.date.today().year))