diff --git a/integrations/cohere/pyproject.toml b/integrations/cohere/pyproject.toml
index 53b7d7febe..90220b2c5c 100644
--- a/integrations/cohere/pyproject.toml
+++ b/integrations/cohere/pyproject.toml
@@ -84,6 +84,7 @@ line-length = 120
 [tool.ruff.lint]
 select = [
   "A",
+  "ANN",
   "ARG",
   "B",
   "C",
@@ -124,6 +125,8 @@ ignore = [
   # Misc
   "B008",
   "S101",
+  # Allow `Any` - used legitimately for dynamic types and SDK boundaries
+  "ANN401",
 ]
 
 [tool.ruff.lint.isort]
@@ -133,8 +136,8 @@ known-first-party = ["haystack_integrations"]
 ban-relative-imports = "parents"
 
 [tool.ruff.lint.per-file-ignores]
-# Tests can use magic values, assertions, and relative imports
-"tests/**/*" = ["PLR2004", "S101", "TID252"]
+# Tests can use magic values, assertions, relative imports, and don't need type annotations
+"tests/**/*" = ["PLR2004", "S101", "TID252", "ANN"]
 
 [tool.coverage.run]
 source = ["haystack_integrations"]
diff --git a/integrations/cohere/src/haystack_integrations/components/embedders/cohere/document_embedder.py b/integrations/cohere/src/haystack_integrations/components/embedders/cohere/document_embedder.py
index 1658219143..4edefe7597 100644
--- a/integrations/cohere/src/haystack_integrations/components/embedders/cohere/document_embedder.py
+++ b/integrations/cohere/src/haystack_integrations/components/embedders/cohere/document_embedder.py
@@ -49,7 +49,7 @@ def __init__(
         meta_fields_to_embed: list[str] | None = None,
         embedding_separator: str = "\n",
         embedding_type: EmbeddingTypes | None = None,
-    ):
+    ) -> None:
         """
         :param api_key: the Cohere API key.
         :param model: the name of the model to use. Supported Models are:
diff --git a/integrations/cohere/src/haystack_integrations/components/embedders/cohere/embedding_types.py b/integrations/cohere/src/haystack_integrations/components/embedders/cohere/embedding_types.py
index 2f11c02cb8..d64d86fe3d 100644
--- a/integrations/cohere/src/haystack_integrations/components/embedders/cohere/embedding_types.py
+++ b/integrations/cohere/src/haystack_integrations/components/embedders/cohere/embedding_types.py
@@ -21,7 +21,7 @@ class EmbeddingTypes(Enum):
     BINARY = "binary"
     UBINARY = "ubinary"
 
-    def __str__(self):
+    def __str__(self) -> str:
         return self.value
 
     @staticmethod
diff --git a/integrations/cohere/src/haystack_integrations/components/embedders/cohere/text_embedder.py b/integrations/cohere/src/haystack_integrations/components/embedders/cohere/text_embedder.py
index cb2694d3ff..f29543e533 100644
--- a/integrations/cohere/src/haystack_integrations/components/embedders/cohere/text_embedder.py
+++ b/integrations/cohere/src/haystack_integrations/components/embedders/cohere/text_embedder.py
@@ -41,7 +41,7 @@ def __init__(
         truncate: str = "END",
         timeout: float = 120.0,
         embedding_type: EmbeddingTypes | None = None,
-    ):
+    ) -> None:
         """
         :param api_key: the Cohere API key.
         :param model: the name of the model to use. Supported Models are:
diff --git a/integrations/cohere/src/haystack_integrations/components/generators/cohere/chat/chat_generator.py b/integrations/cohere/src/haystack_integrations/components/generators/cohere/chat/chat_generator.py
index 1205e6ef09..5d47d4d35c 100644
--- a/integrations/cohere/src/haystack_integrations/components/generators/cohere/chat/chat_generator.py
+++ b/integrations/cohere/src/haystack_integrations/components/generators/cohere/chat/chat_generator.py
@@ -491,7 +491,7 @@ def __init__(
         *,
         timeout: float | None = None,
         max_retries: int | None = None,
-    ):
+    ) -> None:
         """
         Initialize the CohereChatGenerator instance.
 
diff --git a/integrations/cohere/src/haystack_integrations/components/generators/cohere/generator.py b/integrations/cohere/src/haystack_integrations/components/generators/cohere/generator.py
index 9f31eff15e..a171d9984f 100644
--- a/integrations/cohere/src/haystack_integrations/components/generators/cohere/generator.py
+++ b/integrations/cohere/src/haystack_integrations/components/generators/cohere/generator.py
@@ -37,7 +37,7 @@ def __init__(
         streaming_callback: Callable | None = None,
         api_base_url: str | None = None,
         **kwargs: Any,
-    ):
+    ) -> None:
         """
         Instantiates a `CohereGenerator` component.
 
diff --git a/integrations/cohere/src/haystack_integrations/components/rankers/cohere/ranker.py b/integrations/cohere/src/haystack_integrations/components/rankers/cohere/ranker.py
index 824e1feec8..8697e5fe07 100644
--- a/integrations/cohere/src/haystack_integrations/components/rankers/cohere/ranker.py
+++ b/integrations/cohere/src/haystack_integrations/components/rankers/cohere/ranker.py
@@ -41,7 +41,7 @@ def __init__(
         meta_fields_to_embed: list[str] | None = None,
         meta_data_separator: str = "\n",
         max_tokens_per_doc: int = 4096,
-    ):
+    ) -> None:
         """
         Creates an instance of the 'CohereRanker'.