diff --git a/integrations/faiss/pyproject.toml b/integrations/faiss/pyproject.toml
index dee32e978b..9041925881 100644
--- a/integrations/faiss/pyproject.toml
+++ b/integrations/faiss/pyproject.toml
@@ -89,6 +89,7 @@ line-length = 120
 [tool.ruff.lint]
 select = [
   "A",
+  "ANN",
   "ARG",
   "B",
   "C",
@@ -133,6 +134,8 @@ ignore = [
   "ARG002",
   # Allow assertions
   "S101",
+  # Allow `Any` - used legitimately for dynamic types and SDK boundaries
+  "ANN401",
 ]
 exclude = ["example"]
 
@@ -144,7 +147,7 @@ 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/faiss/src/haystack_integrations/components/retrievers/faiss/embedding_retriever.py b/integrations/faiss/src/haystack_integrations/components/retrievers/faiss/embedding_retriever.py
index fde48d7bf1..7637e9091a 100644
--- a/integrations/faiss/src/haystack_integrations/components/retrievers/faiss/embedding_retriever.py
+++ b/integrations/faiss/src/haystack_integrations/components/retrievers/faiss/embedding_retriever.py
@@ -59,7 +59,7 @@ 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 `FAISSDocumentStore`.
         :param filters: Filters applied to the retrieved Documents at initialisation time. At runtime, these are merged
diff --git a/integrations/faiss/src/haystack_integrations/document_stores/faiss/document_store.py b/integrations/faiss/src/haystack_integrations/document_stores/faiss/document_store.py
index a51f6173cf..e0c82e2b74 100644
--- a/integrations/faiss/src/haystack_integrations/document_stores/faiss/document_store.py
+++ b/integrations/faiss/src/haystack_integrations/document_stores/faiss/document_store.py
@@ -34,7 +34,7 @@ def __init__(
         index_path: str | None = None,
         index_string: str = "Flat",
         embedding_dim: int = 768,
-    ):
+    ) -> None:
         """
         Initializes the FAISSDocumentStore.
 
@@ -61,7 +61,7 @@ def __init__(
         else:
             self._create_new_index()
 
-    def _create_new_index(self):
+    def _create_new_index(self) -> None:
         """Creates a new FAISS index."""
         try:
             # We use IndexIDMap to support add_with_ids
diff --git a/integrations/fastembed/pyproject.toml b/integrations/fastembed/pyproject.toml
index 0ce009db79..01fad41085 100644
--- a/integrations/fastembed/pyproject.toml
+++ b/integrations/fastembed/pyproject.toml
@@ -79,6 +79,7 @@ line-length = 120
 [tool.ruff.lint]
 select = [
   "A",
+  "ANN",
   "ARG",
   "B",
   "C",
@@ -115,6 +116,8 @@ ignore = [
   "S105",
   "S106",
   "S107",
+  # Allow `Any` - used legitimately for dynamic types and SDK boundaries
+  "ANN401",
   # Ignore complexity
   "C901",
   "PLR0911",
@@ -131,7 +134,7 @@ 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"]
 # examples can contain "print" commands
 "examples/**/*" = ["T201", "E501"]
 
diff --git a/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/embedding_backend/fastembed_backend.py b/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/embedding_backend/fastembed_backend.py
index cc70cabd56..1532c0e72b 100644
--- a/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/embedding_backend/fastembed_backend.py
+++ b/integrations/fastembed/src/haystack_integrations/components/embedders/fastembed/embedding_backend/fastembed_backend.py
@@ -44,7 +44,7 @@ def __init__(
         cache_dir: str | None = None,
         threads: int | None = None,
         local_files_only: bool = False,
-    ):
+    ) -> None:
         self.model = TextEmbedding(
             model_name=model_name, cache_dir=cache_dir, threads=threads, local_files_only=local_files_only
         )
@@ -103,7 +103,7 @@ def __init__(
         threads: int | None = None,
         local_files_only: bool = False,
         model_kwargs: dict[str, Any] | None = None,
-    ):
+    ) -> None:
         model_kwargs = model_kwargs or {}
 
         self.model = SparseTextEmbedding(
diff --git a/integrations/fastembed/src/haystack_integrations/components/rankers/fastembed/ranker.py b/integrations/fastembed/src/haystack_integrations/components/rankers/fastembed/ranker.py
index 26878387f4..efb6ac89b3 100644
--- a/integrations/fastembed/src/haystack_integrations/components/rankers/fastembed/ranker.py
+++ b/integrations/fastembed/src/haystack_integrations/components/rankers/fastembed/ranker.py
@@ -46,7 +46,7 @@ def __init__(
         local_files_only: bool = False,
         meta_fields_to_embed: list[str] | None = None,
         meta_data_separator: str = "\n",
-    ):
+    ) -> None:
         """
         Creates an instance of the 'FastembedRanker'.
 
@@ -114,7 +114,7 @@ def from_dict(cls, data: dict[str, Any]) -> "FastembedRanker":
         """
         return default_from_dict(cls, data)
 
-    def warm_up(self):
+    def warm_up(self) -> None:
         """
         Initializes the component.
         """
diff --git a/integrations/firecrawl/pyproject.toml b/integrations/firecrawl/pyproject.toml
index f72ef53535..4f98d541ca 100644
--- a/integrations/firecrawl/pyproject.toml
+++ b/integrations/firecrawl/pyproject.toml
@@ -88,6 +88,7 @@ line-length = 120
 [tool.ruff.lint]
 select = [
     "A",
+    "ANN",
     "ARG",
     "B",
     "C",
@@ -123,6 +124,8 @@ ignore = [
     "S105",
     "S106",
     "S107",
+    # Allow `Any` - used legitimately for dynamic types and SDK boundaries
+    "ANN401",
     # Ignore complexity
     "C901",
     "PLR0911",
@@ -143,7 +146,7 @@ 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"]
 
 [tool.coverage.run]
 source = ["haystack_integrations"]
diff --git a/integrations/github/pyproject.toml b/integrations/github/pyproject.toml
index 2b8bf9d2a9..19de81b37d 100644
--- a/integrations/github/pyproject.toml
+++ b/integrations/github/pyproject.toml
@@ -81,6 +81,7 @@ line-length = 120
 [tool.ruff.lint]
 select = [
   "A",
+  "ANN",
   "ARG",
   "B",
   "C",
@@ -121,6 +122,8 @@ ignore = [
   # Misc
   "B008",
   "S101",
+  # Allow `Any` - used legitimately for dynamic types and SDK boundaries
+  "ANN401",
 ]
 
 [tool.ruff.lint.isort]
@@ -131,7 +134,7 @@ 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"]
 # Ignore RUF001 for all files in the prompts directory
 "src/haystack_integrations/components/prompts/**/*" = ["RUF001"]
 
diff --git a/integrations/github/src/haystack_integrations/components/connectors/github/file_editor.py b/integrations/github/src/haystack_integrations/components/connectors/github/file_editor.py
index 9b72214dde..eb17606f2b 100644
--- a/integrations/github/src/haystack_integrations/components/connectors/github/file_editor.py
+++ b/integrations/github/src/haystack_integrations/components/connectors/github/file_editor.py
@@ -82,7 +82,7 @@ def __init__(
         repo: str | None = None,
         branch: str = "main",
         raise_on_failure: bool = True,
-    ):
+    ) -> None:
         """
         Initialize the component.
 
diff --git a/integrations/github/src/haystack_integrations/components/connectors/github/issue_commenter.py b/integrations/github/src/haystack_integrations/components/connectors/github/issue_commenter.py
index 9f3eaca6ab..c422be8fbd 100644
--- a/integrations/github/src/haystack_integrations/components/connectors/github/issue_commenter.py
+++ b/integrations/github/src/haystack_integrations/components/connectors/github/issue_commenter.py
@@ -41,7 +41,7 @@ def __init__(
         github_token: Secret = Secret.from_env_var("GITHUB_TOKEN"),
         raise_on_failure: bool = True,
         retry_attempts: int = 2,
-    ):
+    ) -> None:
         """
         Initialize the component.
 
diff --git a/integrations/github/src/haystack_integrations/components/connectors/github/issue_viewer.py b/integrations/github/src/haystack_integrations/components/connectors/github/issue_viewer.py
index 83e90c5edd..dd513ff2cf 100644
--- a/integrations/github/src/haystack_integrations/components/connectors/github/issue_viewer.py
+++ b/integrations/github/src/haystack_integrations/components/connectors/github/issue_viewer.py
@@ -40,7 +40,7 @@ def __init__(
         github_token: Secret | None = None,
         raise_on_failure: bool = True,
         retry_attempts: int = 2,
-    ):
+    ) -> None:
         """
         Initialize the component.
 
diff --git a/integrations/github/src/haystack_integrations/components/connectors/github/pr_creator.py b/integrations/github/src/haystack_integrations/components/connectors/github/pr_creator.py
index 2c2e8d8eda..319d8cffe2 100644
--- a/integrations/github/src/haystack_integrations/components/connectors/github/pr_creator.py
+++ b/integrations/github/src/haystack_integrations/components/connectors/github/pr_creator.py
@@ -38,7 +38,12 @@ class GitHubPRCreator:
     ```
     """
 
-    def __init__(self, *, github_token: Secret = Secret.from_env_var("GITHUB_TOKEN"), raise_on_failure: bool = True):
+    def __init__(
+        self,
+        *,
+        github_token: Secret = Secret.from_env_var("GITHUB_TOKEN"),
+        raise_on_failure: bool = True,
+    ) -> None:
         """
         Initialize the component.
 
diff --git a/integrations/github/src/haystack_integrations/components/connectors/github/repo_forker.py b/integrations/github/src/haystack_integrations/components/connectors/github/repo_forker.py
index 725a3e18b8..34af08d76f 100644
--- a/integrations/github/src/haystack_integrations/components/connectors/github/repo_forker.py
+++ b/integrations/github/src/haystack_integrations/components/connectors/github/repo_forker.py
@@ -48,7 +48,7 @@ def __init__(
         poll_interval: int = 2,
         auto_sync: bool = True,
         create_branch: bool = True,
-    ):
+    ) -> None:
         """
         Initialize the component.
 
diff --git a/integrations/github/src/haystack_integrations/components/connectors/github/repo_viewer.py b/integrations/github/src/haystack_integrations/components/connectors/github/repo_viewer.py
index edf6a8a50e..0fcae77e25 100644
--- a/integrations/github/src/haystack_integrations/components/connectors/github/repo_viewer.py
+++ b/integrations/github/src/haystack_integrations/components/connectors/github/repo_viewer.py
@@ -76,7 +76,7 @@ def __init__(
         max_file_size: int = 1_000_000,  # 1MB default limit
         repo: str | None = None,
         branch: str = "main",
-    ):
+    ) -> None:
         """
         Initialize the component.
 
diff --git a/integrations/github/src/haystack_integrations/tools/github/file_editor_tool.py b/integrations/github/src/haystack_integrations/tools/github/file_editor_tool.py
index 3254c02deb..60181b1d2b 100644
--- a/integrations/github/src/haystack_integrations/tools/github/file_editor_tool.py
+++ b/integrations/github/src/haystack_integrations/tools/github/file_editor_tool.py
@@ -31,7 +31,7 @@ def __init__(
         outputs_to_string: dict[str, str | Callable[[Any], str]] | None = None,
         inputs_from_state: dict[str, str] | None = None,
         outputs_to_state: dict[str, dict[str, str | Callable]] | None = None,
-    ):
+    ) -> None:
         """
         Initialize the GitHub file editor tool.
 
diff --git a/integrations/github/src/haystack_integrations/tools/github/issue_commenter_tool.py b/integrations/github/src/haystack_integrations/tools/github/issue_commenter_tool.py
index eb89c67397..bec2387466 100644
--- a/integrations/github/src/haystack_integrations/tools/github/issue_commenter_tool.py
+++ b/integrations/github/src/haystack_integrations/tools/github/issue_commenter_tool.py
@@ -30,7 +30,7 @@ def __init__(
         outputs_to_string: dict[str, str | Callable[[Any], str]] | None = None,
         inputs_from_state: dict[str, str] | None = None,
         outputs_to_state: dict[str, dict[str, str | Callable]] | None = None,
-    ):
+    ) -> None:
         """
         Initialize the GitHub issue commenter tool.
 
diff --git a/integrations/github/src/haystack_integrations/tools/github/issue_viewer_tool.py b/integrations/github/src/haystack_integrations/tools/github/issue_viewer_tool.py
index 47326c7a71..b5bde3c734 100644
--- a/integrations/github/src/haystack_integrations/tools/github/issue_viewer_tool.py
+++ b/integrations/github/src/haystack_integrations/tools/github/issue_viewer_tool.py
@@ -30,7 +30,7 @@ def __init__(
         outputs_to_string: dict[str, str | Callable[[Any], str]] | None = None,
         inputs_from_state: dict[str, str] | None = None,
         outputs_to_state: dict[str, dict[str, str | Callable]] | None = None,
-    ):
+    ) -> None:
         """
         Initialize the GitHub issue viewer tool.
 
diff --git a/integrations/github/src/haystack_integrations/tools/github/pr_creator_tool.py b/integrations/github/src/haystack_integrations/tools/github/pr_creator_tool.py
index f076535146..208f799ce3 100644
--- a/integrations/github/src/haystack_integrations/tools/github/pr_creator_tool.py
+++ b/integrations/github/src/haystack_integrations/tools/github/pr_creator_tool.py
@@ -29,7 +29,7 @@ def __init__(
         outputs_to_string: dict[str, str | Callable[[Any], str]] | None = None,
         inputs_from_state: dict[str, str] | None = None,
         outputs_to_state: dict[str, dict[str, str | Callable]] | None = None,
-    ):
+    ) -> None:
         """
         Initialize the GitHub PR creator tool.
 
diff --git a/integrations/github/src/haystack_integrations/tools/github/repo_forker_tool.py b/integrations/github/src/haystack_integrations/tools/github/repo_forker_tool.py
index aade61ed32..4c5253dc2b 100644
--- a/integrations/github/src/haystack_integrations/tools/github/repo_forker_tool.py
+++ b/integrations/github/src/haystack_integrations/tools/github/repo_forker_tool.py
@@ -29,7 +29,7 @@ def __init__(
         outputs_to_string: dict[str, str | Callable[[Any], str]] | None = None,
         inputs_from_state: dict[str, str] | None = None,
         outputs_to_state: dict[str, dict[str, str | Callable]] | None = None,
-    ):
+    ) -> None:
         """
         Initialize the GitHub Repo Forker tool.
 
diff --git a/integrations/github/src/haystack_integrations/tools/github/repo_viewer_tool.py b/integrations/github/src/haystack_integrations/tools/github/repo_viewer_tool.py
index 91d40a0ab5..0380676775 100644
--- a/integrations/github/src/haystack_integrations/tools/github/repo_viewer_tool.py
+++ b/integrations/github/src/haystack_integrations/tools/github/repo_viewer_tool.py
@@ -32,7 +32,7 @@ def __init__(
         outputs_to_string: dict[str, str | Callable[[Any], str]] | None = None,
         inputs_from_state: dict[str, str] | None = None,
         outputs_to_state: dict[str, dict[str, str | Callable]] | None = None,
-    ):
+    ) -> None:
         """
         Initialize the GitHub repository viewer tool.
 
diff --git a/integrations/google_ai/pyproject.toml b/integrations/google_ai/pyproject.toml
index 48031728f7..0c5275fb69 100644
--- a/integrations/google_ai/pyproject.toml
+++ b/integrations/google_ai/pyproject.toml
@@ -87,6 +87,7 @@ line-length = 120
 [tool.ruff.lint]
 select = [
   "A",
+  "ANN",
   "ARG",
   "B",
   "C",
@@ -121,6 +122,8 @@ ignore = [
   "S105",
   "S106",
   "S107",
+  # Allow `Any` - used legitimately for dynamic types and SDK boundaries
+  "ANN401",
   # Ignore complexity
   "C901",
   "PLR0911",
@@ -141,7 +144,7 @@ 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"]
 
 [tool.coverage.run]
 source = ["haystack_integrations"]
diff --git a/integrations/google_ai/src/haystack_integrations/components/generators/google_ai/chat/gemini.py b/integrations/google_ai/src/haystack_integrations/components/generators/google_ai/chat/gemini.py
index 00b3a0d4d5..e0910c7444 100644
--- a/integrations/google_ai/src/haystack_integrations/components/generators/google_ai/chat/gemini.py
+++ b/integrations/google_ai/src/haystack_integrations/components/generators/google_ai/chat/gemini.py
@@ -151,7 +151,7 @@ def __init__(
         tools: Optional[list[Tool]] = None,
         tool_config: Optional[content_types.ToolConfigDict] = None,
         streaming_callback: Optional[StreamingCallbackT] = None,
-    ):
+    ) -> None:
         """
         Initializes a `GoogleAIGeminiChatGenerator` instance.
 
@@ -262,7 +262,7 @@ def run(
         streaming_callback: Optional[StreamingCallbackT] = None,
         *,
         tools: Optional[list[Tool]] = None,
-    ):
+    ) -> dict[str, list[ChatMessage]]:
         """
         Generates text based on the provided messages.
 
@@ -315,7 +315,7 @@ async def run_async(
         streaming_callback: Optional[StreamingCallbackT] = None,
         *,
         tools: Optional[list[Tool]] = None,
-    ):
+    ) -> dict[str, list[ChatMessage]]:
         """
         Async version of the run method. Generates text based on the provided messages.
 
diff --git a/integrations/google_ai/src/haystack_integrations/components/generators/google_ai/gemini.py b/integrations/google_ai/src/haystack_integrations/components/generators/google_ai/gemini.py
index 3519053d88..089be60ad8 100644
--- a/integrations/google_ai/src/haystack_integrations/components/generators/google_ai/gemini.py
+++ b/integrations/google_ai/src/haystack_integrations/components/generators/google_ai/gemini.py
@@ -62,7 +62,7 @@ class GoogleAIGeminiGenerator:
     ```
     """
 
-    def __new__(cls, *_, **kwargs):
+    def __new__(cls, *_: Any, **kwargs: Any) -> "GoogleAIGeminiGenerator":
         if "tools" in kwargs:
             msg = (
                 "GoogleAIGeminiGenerator does not support the `tools` parameter. "
@@ -80,7 +80,7 @@ def __init__(
         generation_config: Optional[Union[GenerationConfig, dict[str, Any]]] = None,
         safety_settings: Optional[dict[HarmCategory, HarmBlockThreshold]] = None,
         streaming_callback: Optional[Callable[[StreamingChunk], None]] = None,
-    ):
+    ) -> None:
         """
         Initializes a `GoogleAIGeminiGenerator` instance.
 
@@ -185,7 +185,7 @@ def run(
         self,
         parts: Variadic[Union[str, ByteStream, Part]],
         streaming_callback: Optional[Callable[[StreamingChunk], None]] = None,
-    ):
+    ) -> dict[str, list[str]]:
         """
         Generates text based on the given input parts.