diff --git a/src/python_inspector/utils_pypi.py b/src/python_inspector/utils_pypi.py
index 690aabec..0f9f78a1 100644
--- a/src/python_inspector/utils_pypi.py
+++ b/src/python_inspector/utils_pypi.py
@@ -1459,6 +1459,23 @@ def tags(self):
 ################################################################################
 
 
+def _repr_credentials(credentials):
+    if credentials is None:
+        return repr(None)
+
+    masked_credentials = credentials.copy()
+    password = masked_credentials.get("password")
+
+    if password is not None:
+        masked_credentials["password"] = (
+            "***"
+            if len(password) < 12
+            else f"{password[:3]}***{password[-3:]}"
+        )
+
+    return repr(masked_credentials)
+
+
 @attr.attributes
 class PypiSimpleRepository:
     """
@@ -1502,7 +1519,7 @@ class PypiSimpleRepository:
         repr=False,
     )
 
-    credentials = attr.ib(type=dict, default=None)
+    credentials = attr.ib(type=dict, default=None, repr=_repr_credentials)
 
     async def _get_package_versions_map(
         self,
diff --git a/tests/test_utils.py b/tests/test_utils.py
index d9c0fe5c..06cf2410 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -96,6 +96,27 @@ def test_get_netrc_auth_with_default():
     )
 
 
+@pytest.mark.parametrize(
+    ("password", "expected"),
+    [
+        ("short123", "***"),
+        ("abcdefghijkl", "abc***jkl"),
+        ("my-very-secret-password", "my-***ord"),
+    ],
+)
+def test_repository_repr_masks_password(password, expected):
+    repo = PypiSimpleRepository(
+        index_url="https://example.com/simple/",
+        credentials={"login": "test-user", "password": password},
+    )
+
+    repo_repr = repr(repo)
+
+    assert "test-user" in repo_repr
+    assert expected in repo_repr
+    assert password not in repo_repr
+
+
 @pytest.mark.asyncio
 @pytest.mark.skipif(sys.version_info < (3, 8), reason="requires python3.8 or higher")
 @mock.patch("python_inspector.utils_pypi.CACHE.get")