diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ac1a8a7d3..dccc64adb 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -17,7 +17,7 @@ repos:
         args: [--markdown-linebreak-ext=md]
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.9.2
+    rev: v0.11.0
     hooks:
       - id: ruff
       - id: ruff-format
diff --git a/haystack/components/converters/output_adapter.py b/haystack/components/converters/output_adapter.py
index 50ffd5391..8fb48c1fc 100644
--- a/haystack/components/converters/output_adapter.py
+++ b/haystack/components/converters/output_adapter.py
@@ -95,7 +95,7 @@ class OutputAdapter:
         input_types.update(route_input_names)
 
         # the env is not needed, discarded automatically
-        component.set_input_types(self, **{var: Any for var in input_types})
+        component.set_input_types(self, **dict.fromkeys(input_types, Any))
         component.set_output_types(self, **{"output": output_type})
         self.output_type = output_type
 
diff --git a/haystack/components/embedders/azure_document_embedder.py b/haystack/components/embedders/azure_document_embedder.py
index 668b50d65..6eeb6dcea 100644
--- a/haystack/components/embedders/azure_document_embedder.py
+++ b/haystack/components/embedders/azure_document_embedder.py
@@ -124,8 +124,8 @@ class AzureOpenAIDocumentEmbedder:
         self.progress_bar = progress_bar
         self.meta_fields_to_embed = meta_fields_to_embed or []
         self.embedding_separator = embedding_separator
-        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", 30.0))
-        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", "30.0"))
+        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", "5"))
         self.default_headers = default_headers or {}
 
         self._client = AzureOpenAI(
diff --git a/haystack/components/embedders/azure_text_embedder.py b/haystack/components/embedders/azure_text_embedder.py
index c37bf2338..384fcbf5d 100644
--- a/haystack/components/embedders/azure_text_embedder.py
+++ b/haystack/components/embedders/azure_text_embedder.py
@@ -104,8 +104,8 @@ class AzureOpenAITextEmbedder:
         self.azure_deployment = azure_deployment
         self.dimensions = dimensions
         self.organization = organization
-        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", 30.0))
-        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", "30.0"))
+        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", "5"))
         self.prefix = prefix
         self.suffix = suffix
         self.default_headers = default_headers or {}
diff --git a/haystack/components/embedders/openai_document_embedder.py b/haystack/components/embedders/openai_document_embedder.py
index fca5e2cfd..b45b3521d 100644
--- a/haystack/components/embedders/openai_document_embedder.py
+++ b/haystack/components/embedders/openai_document_embedder.py
@@ -108,9 +108,9 @@ class OpenAIDocumentEmbedder:
         self.embedding_separator = embedding_separator
 
         if timeout is None:
-            timeout = float(os.environ.get("OPENAI_TIMEOUT", 30.0))
+            timeout = float(os.environ.get("OPENAI_TIMEOUT", "30.0"))
         if max_retries is None:
-            max_retries = int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+            max_retries = int(os.environ.get("OPENAI_MAX_RETRIES", "5"))
 
         self.client = OpenAI(
             api_key=api_key.resolve_value(),
diff --git a/haystack/components/embedders/openai_text_embedder.py b/haystack/components/embedders/openai_text_embedder.py
index 32b2f6da3..5cb8ccd9b 100644
--- a/haystack/components/embedders/openai_text_embedder.py
+++ b/haystack/components/embedders/openai_text_embedder.py
@@ -90,9 +90,9 @@ class OpenAITextEmbedder:
         self.api_key = api_key
 
         if timeout is None:
-            timeout = float(os.environ.get("OPENAI_TIMEOUT", 30.0))
+            timeout = float(os.environ.get("OPENAI_TIMEOUT", "30.0"))
         if max_retries is None:
-            max_retries = int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+            max_retries = int(os.environ.get("OPENAI_MAX_RETRIES", "5"))
 
         self.client = OpenAI(
             api_key=api_key.resolve_value(),
diff --git a/haystack/components/generators/azure.py b/haystack/components/generators/azure.py
index f51a08989..f52599ce6 100644
--- a/haystack/components/generators/azure.py
+++ b/haystack/components/generators/azure.py
@@ -136,8 +136,8 @@ class AzureOpenAIGenerator(OpenAIGenerator):
         self.azure_deployment = azure_deployment
         self.organization = organization
         self.model: str = azure_deployment or "gpt-4o-mini"
-        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", 30.0))
-        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", "30.0"))
+        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", "5"))
         self.default_headers = default_headers or {}
 
         self.client = AzureOpenAI(
diff --git a/haystack/components/generators/chat/azure.py b/haystack/components/generators/chat/azure.py
index c18baca21..6ccab312c 100644
--- a/haystack/components/generators/chat/azure.py
+++ b/haystack/components/generators/chat/azure.py
@@ -146,8 +146,8 @@ class AzureOpenAIChatGenerator(OpenAIChatGenerator):
         self.azure_deployment = azure_deployment
         self.organization = organization
         self.model = azure_deployment or "gpt-4o-mini"
-        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", 30.0))
-        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", "30.0"))
+        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", "5"))
         self.default_headers = default_headers or {}
 
         _check_duplicate_tool_names(tools)
diff --git a/haystack/components/generators/chat/openai.py b/haystack/components/generators/chat/openai.py
index a671a81a1..2fe48d8bf 100644
--- a/haystack/components/generators/chat/openai.py
+++ b/haystack/components/generators/chat/openai.py
@@ -146,9 +146,9 @@ class OpenAIChatGenerator:
         _check_duplicate_tool_names(tools)
 
         if timeout is None:
-            timeout = float(os.environ.get("OPENAI_TIMEOUT", 30.0))
+            timeout = float(os.environ.get("OPENAI_TIMEOUT", "30.0"))
         if max_retries is None:
-            max_retries = int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+            max_retries = int(os.environ.get("OPENAI_MAX_RETRIES", "5"))
 
         client_args: Dict[str, Any] = {
             "api_key": api_key.resolve_value(),
diff --git a/haystack/components/generators/openai.py b/haystack/components/generators/openai.py
index 3a87b8c06..c0262460f 100644
--- a/haystack/components/generators/openai.py
+++ b/haystack/components/generators/openai.py
@@ -112,9 +112,9 @@ class OpenAIGenerator:
         self.organization = organization
 
         if timeout is None:
-            timeout = float(os.environ.get("OPENAI_TIMEOUT", 30.0))
+            timeout = float(os.environ.get("OPENAI_TIMEOUT", "30.0"))
         if max_retries is None:
-            max_retries = int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+            max_retries = int(os.environ.get("OPENAI_MAX_RETRIES", "5"))
 
         self.client = OpenAI(
             api_key=api_key.resolve_value(),
diff --git a/haystack/components/generators/openai_dalle.py b/haystack/components/generators/openai_dalle.py
index 8b60c13c8..603a56b63 100644
--- a/haystack/components/generators/openai_dalle.py
+++ b/haystack/components/generators/openai_dalle.py
@@ -71,8 +71,8 @@ class DALLEImageGenerator:
         self.api_base_url = api_base_url
         self.organization = organization
 
-        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", 30.0))
-        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+        self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", "30.0"))
+        self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", "5"))
 
         self.client: Optional[OpenAI] = None
 
diff --git a/haystack/components/routers/conditional_router.py b/haystack/components/routers/conditional_router.py
index 6a1a983a7..048a62ce9 100644
--- a/haystack/components/routers/conditional_router.py
+++ b/haystack/components/routers/conditional_router.py
@@ -225,7 +225,7 @@ class ConditionalRouter:
             logger.warning(msg)
 
         # add mandatory input types
-        component.set_input_types(self, **{var: Any for var in mandatory_input_types})
+        component.set_input_types(self, **dict.fromkeys(mandatory_input_types, Any))
 
         # now add optional input types
         for optional_var_name in self.optional_variables:
diff --git a/haystack/components/routers/file_type_router.py b/haystack/components/routers/file_type_router.py
index 626c8693a..c1a2ad4dd 100644
--- a/haystack/components/routers/file_type_router.py
+++ b/haystack/components/routers/file_type_router.py
@@ -96,7 +96,7 @@ class FileTypeRouter:
         component.set_output_types(
             self,
             unclassified=List[Union[str, Path, ByteStream]],
-            **{mime_type: List[Union[str, Path, ByteStream]] for mime_type in mime_types},
+            **dict.fromkeys(mime_types, List[Union[str, Path, ByteStream]]),
         )
         self.mime_types = mime_types
         self._additional_mimetypes = additional_mimetypes
diff --git a/haystack/components/routers/metadata_router.py b/haystack/components/routers/metadata_router.py
index f0604d912..e7958b262 100644
--- a/haystack/components/routers/metadata_router.py
+++ b/haystack/components/routers/metadata_router.py
@@ -81,7 +81,7 @@ class MetadataRouter:
                 raise ValueError(
                     "Invalid filter syntax. See https://docs.haystack.deepset.ai/docs/metadata-filtering for details."
                 )
-        component.set_output_types(self, unmatched=List[Document], **{edge: List[Document] for edge in rules})
+        component.set_output_types(self, unmatched=List[Document], **dict.fromkeys(rules, List[Document]))
 
     def run(self, documents: List[Document]):
         """
diff --git a/haystack/components/routers/text_language_router.py b/haystack/components/routers/text_language_router.py
index 2c517df2f..bcf6cbc1d 100644
--- a/haystack/components/routers/text_language_router.py
+++ b/haystack/components/routers/text_language_router.py
@@ -59,7 +59,7 @@ class TextLanguageRouter:
         if not languages:
             languages = ["en"]
         self.languages = languages
-        component.set_output_types(self, unmatched=str, **{language: str for language in languages})
+        component.set_output_types(self, unmatched=str, **dict.fromkeys(languages, str))
 
     def run(self, text: str) -> Dict[str, str]:
         """
diff --git a/haystack/components/routers/transformers_text_router.py b/haystack/components/routers/transformers_text_router.py
index 61b3dc9ce..ea289de0d 100644
--- a/haystack/components/routers/transformers_text_router.py
+++ b/haystack/components/routers/transformers_text_router.py
@@ -116,7 +116,7 @@ class TransformersTextRouter:
             self.labels = list(config.label2id.keys())
         else:
             self.labels = labels
-        component.set_output_types(self, **{label: str for label in self.labels})
+        component.set_output_types(self, **dict.fromkeys(self.labels, str))
 
         self.pipeline = None
 
diff --git a/haystack/components/routers/zero_shot_text_router.py b/haystack/components/routers/zero_shot_text_router.py
index 7c551b5dc..2dd0db47b 100644
--- a/haystack/components/routers/zero_shot_text_router.py
+++ b/haystack/components/routers/zero_shot_text_router.py
@@ -128,7 +128,7 @@ class TransformersZeroShotTextRouter:
         self.token = token
         self.labels = labels
         self.multi_label = multi_label
-        component.set_output_types(self, **{label: str for label in labels})
+        component.set_output_types(self, **dict.fromkeys(labels, str))
 
         huggingface_pipeline_kwargs = resolve_hf_pipeline_kwargs(
             huggingface_pipeline_kwargs=huggingface_pipeline_kwargs or {},
diff --git a/haystack/core/pipeline/async_pipeline.py b/haystack/core/pipeline/async_pipeline.py
index 9307b9278..72774ae1a 100644
--- a/haystack/core/pipeline/async_pipeline.py
+++ b/haystack/core/pipeline/async_pipeline.py
@@ -143,7 +143,7 @@ class AsyncPipeline(PipelineBase):
         # For quick lookup of downstream receivers
         ordered_names = sorted(self.graph.nodes.keys())
         cached_receivers = {n: self._find_receivers_from(n) for n in ordered_names}
-        component_visits = {component_name: 0 for component_name in ordered_names}
+        component_visits = dict.fromkeys(ordered_names, 0)
         cached_topological_sort = None
 
         # We fill the queue once and raise if all components are BLOCKED
diff --git a/haystack/core/pipeline/pipeline.py b/haystack/core/pipeline/pipeline.py
index e50d2b752..0a1f7e642 100644
--- a/haystack/core/pipeline/pipeline.py
+++ b/haystack/core/pipeline/pipeline.py
@@ -202,7 +202,7 @@ class Pipeline(PipelineBase):
         ordered_component_names = sorted(self.graph.nodes.keys())
 
         # We track component visits to decide if a component can run.
-        component_visits = {component_name: 0 for component_name in ordered_component_names}
+        component_visits = dict.fromkeys(ordered_component_names, 0)
 
         # We need to access a component's receivers multiple times during a pipeline run.
         # We store them here for easy access.
diff --git a/haystack/testing/factory.py b/haystack/testing/factory.py
index 94ee5da85..9e5c2d61c 100644
--- a/haystack/testing/factory.py
+++ b/haystack/testing/factory.py
@@ -214,7 +214,7 @@ def component_class(  # pylint: disable=too-many-positional-arguments
     def run(self, **kwargs):  # pylint: disable=unused-argument
         if output is not None:
             return output
-        return {name: None for name in output_types.keys()}
+        return dict.fromkeys(output_types.keys())
 
     def to_dict(self):
         return default_to_dict(self)
diff --git a/haystack/testing/sample_components/fstring.py b/haystack/testing/sample_components/fstring.py
index a95bc3f41..f128c0955 100644
--- a/haystack/testing/sample_components/fstring.py
+++ b/haystack/testing/sample_components/fstring.py
@@ -18,7 +18,7 @@ class FString:
         self.variables = variables or []
         if "template" in self.variables:
             raise ValueError("The variable name 'template' is reserved and cannot be used.")
-        component.set_input_types(self, **{variable: Any for variable in self.variables})
+        component.set_input_types(self, **dict.fromkeys(self.variables, Any))
 
     @component.output_types(string=str)
     def run(self, template: Optional[str] = None, **kwargs):
diff --git a/haystack/testing/sample_components/repeat.py b/haystack/testing/sample_components/repeat.py
index 5cc41d742..744654743 100644
--- a/haystack/testing/sample_components/repeat.py
+++ b/haystack/testing/sample_components/repeat.py
@@ -11,10 +11,10 @@ from haystack.core.component import component
 class Repeat:
     def __init__(self, outputs: List[str]):
         self._outputs = outputs
-        component.set_output_types(self, **{k: int for k in outputs})
+        component.set_output_types(self, **dict.fromkeys(outputs, int))
 
     def run(self, value: int):
         """
         :param value: the value to repeat.
         """
-        return {val: value for val in self._outputs}
+        return dict.fromkeys(self._outputs, value)
diff --git a/pyproject.toml b/pyproject.toml
index a44d10a6e..d1e49d5c8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,7 +64,7 @@ dependencies = [
 installer = "uv"
 dependencies = [
   "pre-commit",
-  "ruff<0.10.0",
+  "ruff",
   "toml",
   "reno",
   # dulwich is a reno dependency, they pin it at >=0.15.0 so pip takes ton of time to resolve the dependency tree.