diff --git a/.github/actions/setup/action.yml b/.github/actions/setup/action.yml
index 8367a057..60f6446b 100644
--- a/.github/actions/setup/action.yml
+++ b/.github/actions/setup/action.yml
@@ -4,7 +4,7 @@ description: Installs the given GardenLinux Python library
 inputs:
   version:
     description: GardenLinux Python library version
-    default: "0.10.12"
+    default: "0.10.13"
   python_version:
     description: Python version to setup
     default: "3.13"
diff --git a/pyproject.toml b/pyproject.toml
index 605f4650..454924d6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "gardenlinux"
-version = "0.10.12"
+version = "0.10.13"
 description = "Contains tools to work with the features directory of gardenlinux, for example deducting dependencies from feature sets or validating cnames"
 authors = ["Garden Linux Maintainers <contact@gardenlinux.io>"]
 license = "Apache-2.0"
diff --git a/src/gardenlinux/s3/s3_artifacts.py b/src/gardenlinux/s3/s3_artifacts.py
index 09a4b17c..afa1f895 100644
--- a/src/gardenlinux/s3/s3_artifacts.py
+++ b/src/gardenlinux/s3/s3_artifacts.py
@@ -169,18 +169,12 @@ def upload_from_directory(
         if commit_id_or_hash is None:
             commit_id_or_hash = cname_object.commit_id
 
-        version_epoch = str(cname_object.version_epoch)
-
-        if version_epoch is None:
-            version_epoch = ""
-
         metadata = {
             "platform": cname_object.feature_set_platform,
             "architecture": arch,
             "base_image": None,
             "build_committish": commit_id_or_hash,
-            "build_timestamp": datetime.fromtimestamp(release_timestamp).isoformat(),
-            "gardenlinux_epoch": version_epoch,
+            "build_timestamp": datetime.fromtimestamp(release_timestamp),
             "logs": None,
             "modifiers": feature_set_list,
             "require_uefi": require_uefi,
@@ -193,6 +187,9 @@ def upload_from_directory(
             "paths": [],
         }
 
+        if cname_object.version_epoch is not None:
+            metadata["gardenlinux_epoch"] = cname_object.version_epoch
+
         platform_variant = cname_object.platform_variant
 
         if platform_variant is not None:
@@ -210,13 +207,11 @@ def upload_from_directory(
                 md5sum = file_digest(fp, "md5").hexdigest()
                 sha256sum = file_digest(fp, "sha256").hexdigest()
 
-            suffixes = "".join(artifact.name)[1 + base_name_length :]
-
             artifact_metadata = {
                 "name": artifact.name,
                 "s3_bucket_name": self._bucket.name,
                 "s3_key": s3_key,
-                "suffix": re_object.sub("+", suffixes),
+                "suffix": re_object.sub("+", artifact.name[base_name_length:]),
                 "md5sum": md5sum,
                 "sha256sum": sha256sum,
             }
diff --git a/tests/s3/constants.py b/tests/s3/constants.py
index 73cc5c7b..1bfecf6f 100644
--- a/tests/s3/constants.py
+++ b/tests/s3/constants.py
@@ -16,8 +16,7 @@
 architecture: amd64
 base_image: null
 build_committish: abc123lo
-build_timestamp: '{build_timestamp}'
-gardenlinux_epoch: '1234'
+build_timestamp: {build_timestamp}
 logs: null
 modifiers:
 - _usi
@@ -33,7 +32,8 @@
 - name: container-amd64-1234.1-abc123lo.release
   s3_bucket_name: test-bucket
   s3_key: objects/container-amd64-1234.1-abc123lo/container-amd64-1234.1-abc123lo.release
-  suffix: release
+  suffix: .release
   md5sum: {md5sum}
   sha256sum: {sha256sum}
+gardenlinux_epoch: 1234
 """.strip()
diff --git a/tests/s3/test_main.py b/tests/s3/test_main.py
index a939f0ca..0d116bf5 100644
--- a/tests/s3/test_main.py
+++ b/tests/s3/test_main.py
@@ -96,8 +96,8 @@ def test_main_with_expected_result(
         result = capsys.readouterr().out.strip()
 
         result = re.sub(
-            "^(.*)build_timestamp\\: '.+'$",
-            "\\1build_timestamp: '{build_timestamp}'",
+            "^(.*)build_timestamp\\: .+$",
+            "\\1build_timestamp: {build_timestamp}",
             result,
             flags=re.M,
         )