diff --git a/pyiron_snippets/resources.py b/pyiron_snippets/resources.py
index c415f66..550c651 100644
--- a/pyiron_snippets/resources.py
+++ b/pyiron_snippets/resources.py
@@ -12,7 +12,7 @@
 from collections.abc import Iterable, Iterator
 from fnmatch import fnmatch
 from glob import glob
-from typing import Any
+from typing import Any, Self
 
 EXE_SUFFIX = "bat" if os.name == "nt" else "sh"
 
@@ -35,7 +35,7 @@ class AbstractResolver(ABC):
     """
 
     @abstractmethod
-    def _search(self, name: tuple[str]) -> Iterator[Any]:
+    def _search(self, name: tuple[str, ...]) -> Iterator[Any]:
         pass
 
     def search(self, name: Iterable[str] | str = "*") -> Iterator[Any]:
@@ -86,7 +86,7 @@ def first(self, name: Iterable[str] | str = "*") -> Any:
         except StopIteration:
             raise ResourceNotFound(f"Could not find {name} in {self}!") from None
 
-    def chain(self, *resolvers: AbstractResolver) -> ResolverChain:
+    def chain(self, *resolvers: AbstractResolver) -> Self | ResolverChain:
         """
         Return a new resolver that searches this and all given resolvers sequentially.