diff --git a/coverage_comment/github_client.py b/coverage_comment/github_client.py
index e6eb6efa..3057e1ec 100644
--- a/coverage_comment/github_client.py
+++ b/coverage_comment/github_client.py
@@ -102,9 +102,13 @@ def _http(
 
 def response_contents(
     response: httpx.Response,
-) -> JsonObject | bytes:
+) -> JsonObject | str | bytes:
     if response.headers.get("content-type", "").startswith("application/json"):
         return response.json(object_hook=JsonObject)
+    if response.headers.get("content-type", "").startswith(
+        "application/vnd.github.raw+json"
+    ):
+        return response.text
     return response.content
 
 
diff --git a/tests/unit/test_github_client.py b/tests/unit/test_github_client.py
index 94f1ce9b..3f07b271 100644
--- a/tests/unit/test_github_client.py
+++ b/tests/unit/test_github_client.py
@@ -13,6 +13,22 @@ def test_github_client__get(session, gh):
     assert gh.repos("a/b").issues().get(a=1) == {"foo": "bar"}
 
 
+def test_github_client__get_text(session, gh):
+    session.register("GET", "/repos/a/b/issues", timeout=60, params={"a": 1})(
+        text="foobar", headers={"content-type": "application/vnd.github.raw+json"}
+    )
+
+    assert gh.repos("a/b").issues().get(a=1) == "foobar"
+
+
+def test_github_client__get_bytes(session, gh):
+    session.register("GET", "/repos/a/b/issues", timeout=60, params={"a": 1})(
+        text="foobar", headers={"content-type": "application/vnd.github.raw+json"}
+    )
+
+    assert gh.repos("a/b").issues().get(a=1, bytes=True) == b"foobar"
+
+
 def test_github_client__get_headers(session, gh):
     session.register("GET", "/repos/a/b/issues", timeout=60, params={"a": 1})(
         json={"foo": "bar"},