diff --git a/comicfn2dict/unparse.py b/comicfn2dict/unparse.py
index 351a115..ee65211 100644
--- a/comicfn2dict/unparse.py
+++ b/comicfn2dict/unparse.py
@@ -62,6 +62,7 @@ class ComicFilenameSerializer:
                 # noop if only day.
                 break
         if parts:
+            parts = (str(part) for part in parts)
             date = "-".join(parts)
             self._log("After date", date)
             self.metadata = MappingProxyType({**self.metadata, "date": date})
@@ -79,6 +80,7 @@ class ComicFilenameSerializer:
         """Add the remainders specially."""
         if remainders := self.metadata.get("remainders"):
             if isinstance(remainders, Sequence):
+                remainders = (str(remainder) for remainder in remainders)
                 remainder = " ".join(remainders)
             else:
                 remainder = str(remainders)
diff --git a/pyproject.toml b/pyproject.toml
index 49f7a9c..5c8d950 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "comicfn2dict"
-version = "0.2.0a1"
+version = "0.2.0a2"
 description = "Parse common comic filenames and return a dict of metadata attributes. Includes a cli."
 license = "GPL-3.0-only"
 authors = ["AJ Slater <aj@slater.net>"]