diff --git a/dangerzone/updater/signatures.py b/dangerzone/updater/signatures.py
index a8f7747..e4cf5d7 100644
--- a/dangerzone/updater/signatures.py
+++ b/dangerzone/updater/signatures.py
@@ -424,7 +424,7 @@ def store_signatures(
         write_log_index(get_log_index_from_signatures(signatures))
 
 
-def verify_local_image(image: str, pubkey: str) -> bool:
+def verify_local_image(image: str, pubkey: str = DEFAULT_PUBKEY_LOCATION) -> bool:
     """
     Verifies that a local image has a valid signature
     """
diff --git a/tests/conftest.py b/tests/conftest.py
index 1b8a9ca..f413d11 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -119,6 +119,14 @@ def sample_pdf() -> str:
     return str(test_docs_dir.joinpath(BASIC_SAMPLE_PDF))
 
 
+@pytest.fixture
+def skip_image_verification(monkeypatch):
+    def noop(*args, **kwargs):
+        return True
+
+    monkeypatch.setattr(container, "verify_local_image", noop)
+
+
 SAMPLE_DIRECTORY = "test_docs"
 BASIC_SAMPLE_PDF = "sample-pdf.pdf"
 BASIC_SAMPLE_DOC = "sample-doc.doc"
diff --git a/tests/isolation_provider/test_container.py b/tests/isolation_provider/test_container.py
index fc74eb3..81f147d 100644
--- a/tests/isolation_provider/test_container.py
+++ b/tests/isolation_provider/test_container.py
@@ -22,7 +22,7 @@ elif os.environ.get("DUMMY_CONVERSION", False):
 
 
 @pytest.fixture
-def provider() -> Container:
+def provider(skip_image_verification: None) -> Container:
     return Container()
 
 
diff --git a/tests/test_cli.py b/tests/test_cli.py
index dbaa880..ffb6022 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -202,7 +202,12 @@ class TestCliConversion(TestCliBasic):
         result.assert_success()
 
     @for_each_doc
-    def test_formats(self, doc: Path, tmp_path_factory: pytest.TempPathFactory) -> None:
+    def test_formats(
+        self,
+        doc: Path,
+        tmp_path_factory: pytest.TempPathFactory,
+        skip_image_verification: pytest.FixtureRequest,
+    ) -> None:
         reference = (doc.parent / "reference" / doc.stem).with_suffix(".pdf")
         destination = tmp_path_factory.mktemp(doc.stem).with_suffix(".pdf")