diff --git a/snakemake/io.py b/snakemake/io.py
index 08987f9a0..36cc05a74 100755
--- a/snakemake/io.py
+++ b/snakemake/io.py
@@ -96,6 +96,7 @@ def lutime(f, times):
     def lchmod(f, mode):
         os.chmod(f, mode, follow_symlinks=False)
 
+
 else:
 
     def lchmod(f, mode):
diff --git a/snakemake/remote/GS.py b/snakemake/remote/GS.py
index ea92e7994..d17135ad8 100644
--- a/snakemake/remote/GS.py
+++ b/snakemake/remote/GS.py
@@ -206,8 +206,10 @@ def exists(self):
             return True
         elif any(self.directory_entries()):
             return True
-        else:
-            return False
+
+        # The blob object can get out of sync, one last try!
+        self.update_blob()
+        return self.blob.exists()
 
     @retry.Retry(predicate=google_cloud_retry_predicate)
     def mtime(self):
diff --git a/tests/conftest.py b/tests/conftest.py
index 2671d16ea..01f08aa9e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -9,7 +9,9 @@
 
 skip_on_windows = pytest.mark.skipif(ON_WINDOWS, reason="Unix stuff")
 only_on_windows = pytest.mark.skipif(not ON_WINDOWS, reason="Windows stuff")
-needs_strace = pytest.mark.xfail(os.system("strace -o /dev/null true") != 0, reason="Missing strace")
+needs_strace = pytest.mark.xfail(
+    os.system("strace -o /dev/null true") != 0, reason="Missing strace"
+)
 
 
 @pytest.fixture(autouse=True)
diff --git a/tests/test_google_lifesciences.py b/tests/test_google_lifesciences.py
index 71fe2cc78..63a75a410 100644
--- a/tests/test_google_lifesciences.py
+++ b/tests/test_google_lifesciences.py
@@ -28,6 +28,7 @@ def cleanup_google_storage(prefix, bucket_name="snakemake-testing", restrict_to=
     Arguments:
       prefix (str) : the "subfolder" or prefix for some files in the buckets
       bucket_name (str) : the name of the bucket, default snakemake-testing
+      restrict_to (list) : only delete files in these paths (None deletes all)
     """
     client = storage.Client()
     bucket = client.get_bucket(bucket_name)
diff --git a/tests/test_io.py b/tests/test_io.py
index 9b6745143..e9d0c8254 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -104,8 +104,11 @@ def __repr__(self):
     ) == sorted(["a: aa + b: b", "a: aa + b: bb", "c: c", "c: cc"])
 
     # expand on pathlib.Path objects
-    assert expand(
-        PosixPath() / "{x}" / "{y}",
-        x="Hello",
-        y="world",
-    ) == ["Hello/world"]
+    assert (
+        expand(
+            PosixPath() / "{x}" / "{y}",
+            x="Hello",
+            y="world",
+        )
+        == ["Hello/world"]
+    )
diff --git a/tests/testapi.py b/tests/testapi.py
index b06a0b9d5..e3904ac78 100644
--- a/tests/testapi.py
+++ b/tests/testapi.py
@@ -72,4 +72,11 @@ def test_dicts_in_config():
                 ),
                 file=f,
             )
-        snakemake(path, workdir=tmpdir, config={"this_option": "does_not_break", "test": {'this_dict':'shoult_not_either'}})
+        snakemake(
+            path,
+            workdir=tmpdir,
+            config={
+                "this_option": "does_not_break",
+                "test": {"this_dict": "shoult_not_either"},
+            },
+        )