diff --git a/integrations/chroma/pyproject.toml b/integrations/chroma/pyproject.toml
index e6d1fbe562..b027eb4547 100644
--- a/integrations/chroma/pyproject.toml
+++ b/integrations/chroma/pyproject.toml
@@ -83,6 +83,7 @@ line-length = 120
 [tool.ruff.lint]
 select = [
   "A",
+  "ANN",
   "ARG",
   "B",
   "C",
@@ -111,6 +112,8 @@ select = [
 ignore = [
   # Allow non-abstract empty methods in abstract base classes
   "B027",
+  # Allow `Any` - used legitimately for **kwargs and dynamic metadata values
+  "ANN401",
   # Allow boolean positional values in function calls, like `dict.get(... True)`
   "FBT003",
   # Ignore checks for possible passwords
@@ -138,7 +141,7 @@ ban-relative-imports = "parents"
 
 [tool.ruff.lint.per-file-ignores]
 # Tests can use magic values, assertions, and relative imports
-"tests/**/*" = ["PLR2004", "S101", "TID252"]
+"tests/**/*" = ["PLR2004", "S101", "TID252", "ANN"]
 "example/**/*" = ["T201"]
 
 [tool.coverage.run]
diff --git a/integrations/chroma/src/haystack_integrations/components/retrievers/chroma/retriever.py b/integrations/chroma/src/haystack_integrations/components/retrievers/chroma/retriever.py
index 430f324a25..ea822b93f1 100644
--- a/integrations/chroma/src/haystack_integrations/components/retrievers/chroma/retriever.py
+++ b/integrations/chroma/src/haystack_integrations/components/retrievers/chroma/retriever.py
@@ -51,7 +51,7 @@ def __init__(
         filters: dict[str, Any] | None = None,
         top_k: int = 10,
         filter_policy: str | FilterPolicy = FilterPolicy.REPLACE,
-    ):
+    ) -> None:
         """
         :param document_store: an instance of `ChromaDocumentStore`.
         :param filters: filters to narrow down the search space.
@@ -164,7 +164,7 @@ def __init__(
         filters: dict[str, Any] | None = None,
         top_k: int = 10,
         filter_policy: str | FilterPolicy = FilterPolicy.REPLACE,
-    ):
+    ) -> None:
         """
         :param document_store: an instance of `ChromaDocumentStore`.
         :param filters: filters to narrow down the search space.
diff --git a/integrations/chroma/src/haystack_integrations/document_stores/chroma/document_store.py b/integrations/chroma/src/haystack_integrations/document_stores/chroma/document_store.py
index 63caae0292..37bccb0afb 100644
--- a/integrations/chroma/src/haystack_integrations/document_stores/chroma/document_store.py
+++ b/integrations/chroma/src/haystack_integrations/document_stores/chroma/document_store.py
@@ -45,7 +45,7 @@ def __init__(
         metadata: dict | None = None,
         client_settings: dict[str, Any] | None = None,
         **embedding_function_params: Any,
-    ):
+    ) -> None:
         """
         Creates a new ChromaDocumentStore instance.
         It is meant to be connected to a Chroma collection.
@@ -102,7 +102,7 @@ def __init__(
         self._collection: chromadb.Collection | None = None
         self._async_collection: AsyncCollection | None = None
 
-    def _ensure_initialized(self):
+    def _ensure_initialized(self) -> None:
         if not self._collection:
             # Create the client instance
             if self._persist_path and (self._host or self._port is not None):
@@ -160,7 +160,7 @@ def _ensure_initialized(self):
                     embedding_function=self._embedding_func,
                 )
 
-    async def _ensure_initialized_async(self):
+    async def _ensure_initialized_async(self) -> None:
         if not self._async_collection:
             if self._host is None or self._port is None:
                 error_message = (
@@ -341,7 +341,7 @@ def _compute_field_min_max(
         for meta in metadatas:
             if meta and field_name in meta:
                 val = meta.get(field_name)
-                if isinstance(val, (str, int, float)):
+                if isinstance(val, str | int | float):
                     values.append(val)
 
         if not values: