diff --git a/docs/create_tasks_table.py b/docs/create_tasks_table.py
index ac16f0313d..6ee4bee7ab 100644
--- a/docs/create_tasks_table.py
+++ b/docs/create_tasks_table.py
@@ -79,7 +79,7 @@ def create_task_lang_table(tasks: list[mteb.AbsTask], sort_by_sum=False) -> str:
             if lang in PROGRAMMING_LANGS:
                 lang = "code"
             if table_dict.get(lang) is None:
-                table_dict[lang] = {k: 0 for k in sorted(get_args(TASK_TYPE))}
+                table_dict[lang] = dict.fromkeys(sorted(get_args(TASK_TYPE)), 0)
             table_dict[lang][task.metadata.type] += 1
 
     ## Wrangle for polars
diff --git a/mteb/abstasks/stratification.py b/mteb/abstasks/stratification.py
index b7e93b7d2e..9df608fa8a 100644
--- a/mteb/abstasks/stratification.py
+++ b/mteb/abstasks/stratification.py
@@ -216,7 +216,7 @@ def _prepare_stratification(self, y: np.ndarray) -> tuple:
             [self.percentage_per_fold[i] * self.n_samples for i in range(self.n_splits)]
         )
         rows = sp.lil_matrix(y).rows
-        rows_used = {i: False for i in range(self.n_samples)}
+        rows_used = dict.fromkeys(range(self.n_samples), False)
         all_combinations = []
         per_row_combinations = [[] for i in range(self.n_samples)]
         samples_with_combination = {}
diff --git a/mteb/evaluation/evaluators/RetrievalEvaluator.py b/mteb/evaluation/evaluators/RetrievalEvaluator.py
index cdf497e5a6..69034b1741 100644
--- a/mteb/evaluation/evaluators/RetrievalEvaluator.py
+++ b/mteb/evaluation/evaluators/RetrievalEvaluator.py
@@ -261,7 +261,7 @@ def search_cross_encoder(
                 logging.info(
                     f"previous_results is None. Using all the documents to rerank: {len(corpus)}"
                 )
-                q_results = {doc_id: 0.0 for doc_id in corpus.keys()}
+                q_results = dict.fromkeys(corpus.keys(), 0.0)
             else:
                 q_results = self.previous_results[qid]
             # take the top-k only
diff --git a/mteb/leaderboard/table.py b/mteb/leaderboard/table.py
index fbc01496e8..5286680dc9 100644
--- a/mteb/leaderboard/table.py
+++ b/mteb/leaderboard/table.py
@@ -258,7 +258,7 @@ def apply_styling(
     joint_table[score_columns] = joint_table[score_columns].map(format_scores)
     joint_table_style = joint_table.style.format(
         {
-            **{column: "{:.2f}" for column in score_columns},
+            **dict.fromkeys(score_columns, "{:.2f}"),
             "Rank (Borda)": "{:.0f}",
         },
         na_rep="",
diff --git a/mteb/task_aggregation.py b/mteb/task_aggregation.py
index e5ce47a4d0..d380333e12 100644
--- a/mteb/task_aggregation.py
+++ b/mteb/task_aggregation.py
@@ -109,8 +109,7 @@ def borda_count(
     results = results.to_legacy_dict()
     n_candidates = sum(len(revs) for revs in results.values())
     candidate_scores = {
-        model: {revision: 0.0 for revision in revisions}
-        for model, revisions in results.items()
+        model: dict.fromkeys(revisions, 0.0) for model, revisions in results.items()
     }
 
     tasks = defaultdict(list)  # {task_name: [(model, revision, score), ...]}
diff --git a/mteb/tasks/Image/Any2AnyRetrieval/multilingual/WITT2IRetrieval.py b/mteb/tasks/Image/Any2AnyRetrieval/multilingual/WITT2IRetrieval.py
index b67c2c0262..9ae6f30c00 100644
--- a/mteb/tasks/Image/Any2AnyRetrieval/multilingual/WITT2IRetrieval.py
+++ b/mteb/tasks/Image/Any2AnyRetrieval/multilingual/WITT2IRetrieval.py
@@ -24,9 +24,9 @@
 def _load_wit_data(
     path: str, langs: list, splits: str, cache_dir: str = None, revision: str = None
 ):
-    corpus = {lang: {split: None for split in splits} for lang in langs}
-    queries = {lang: {split: None for split in splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(splits) for lang in langs}
+    queries = {lang: dict.fromkeys(splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(splits) for lang in langs}
 
     split = "test"
 
diff --git a/mteb/tasks/Image/Any2AnyRetrieval/multilingual/XFlickr30kCoT2IRetrieval.py b/mteb/tasks/Image/Any2AnyRetrieval/multilingual/XFlickr30kCoT2IRetrieval.py
index 0e08df2b9d..c5d373568a 100644
--- a/mteb/tasks/Image/Any2AnyRetrieval/multilingual/XFlickr30kCoT2IRetrieval.py
+++ b/mteb/tasks/Image/Any2AnyRetrieval/multilingual/XFlickr30kCoT2IRetrieval.py
@@ -21,9 +21,9 @@
 def _load_xflickrco_data(
     path: str, langs: list, splits: str, cache_dir: str = None, revision: str = None
 ):
-    corpus = {lang: {split: None for split in splits} for lang in langs}
-    queries = {lang: {split: None for split in splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(splits) for lang in langs}
+    queries = {lang: dict.fromkeys(splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(splits) for lang in langs}
 
     split = "test"
 
diff --git a/mteb/tasks/Image/Any2AnyRetrieval/multilingual/XM3600T2IRetrieval.py b/mteb/tasks/Image/Any2AnyRetrieval/multilingual/XM3600T2IRetrieval.py
index 17136c8e3a..d05758b6d6 100644
--- a/mteb/tasks/Image/Any2AnyRetrieval/multilingual/XM3600T2IRetrieval.py
+++ b/mteb/tasks/Image/Any2AnyRetrieval/multilingual/XM3600T2IRetrieval.py
@@ -49,9 +49,9 @@
 def _load_xm3600_data(
     path: str, langs: list, splits: str, cache_dir: str = None, revision: str = None
 ):
-    corpus = {lang: {split: None for split in splits} for lang in langs}
-    queries = {lang: {split: None for split in splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(splits) for lang in langs}
+    queries = {lang: dict.fromkeys(splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(splits) for lang in langs}
 
     split = "test"
 
diff --git a/mteb/tasks/Retrieval/dan/TwitterHjerneRetrieval.py b/mteb/tasks/Retrieval/dan/TwitterHjerneRetrieval.py
index 198d1bc1b5..ae9ec81117 100644
--- a/mteb/tasks/Retrieval/dan/TwitterHjerneRetrieval.py
+++ b/mteb/tasks/Retrieval/dan/TwitterHjerneRetrieval.py
@@ -87,9 +87,7 @@ def dataset_transform(self) -> None:
                         answer_id = str(text2id[a])
                     answer_ids.append(answer_id)
 
-                self.relevant_docs[split][query_id] = {
-                    answer_id: 1 for answer_id in answer_ids
-                }
+                self.relevant_docs[split][query_id] = dict.fromkeys(answer_ids, 1)
 
 
 def answers_to_list(example: dict) -> dict:
diff --git a/mteb/tasks/Retrieval/deu/GerDaLIRRetrieval.py b/mteb/tasks/Retrieval/deu/GerDaLIRRetrieval.py
index 380f30dcdf..189641f271 100644
--- a/mteb/tasks/Retrieval/deu/GerDaLIRRetrieval.py
+++ b/mteb/tasks/Retrieval/deu/GerDaLIRRetrieval.py
@@ -74,7 +74,8 @@ def load_data(self, **kwargs):
         self.corpus = {self._EVAL_SPLIT: {row["_id"]: row for row in corpus_rows}}
         self.relevant_docs = {
             self._EVAL_SPLIT: {
-                row["_id"]: {v: 1 for v in row["text"].split(" ")} for row in qrels_rows
+                row["_id"]: dict.fromkeys(row["text"].split(" "), 1)
+                for row in qrels_rows
             }
         }
 
diff --git a/mteb/tasks/Retrieval/deu/GermanDPRRetrieval.py b/mteb/tasks/Retrieval/deu/GermanDPRRetrieval.py
index 9b280aaecf..0083fcff9e 100644
--- a/mteb/tasks/Retrieval/deu/GermanDPRRetrieval.py
+++ b/mteb/tasks/Retrieval/deu/GermanDPRRetrieval.py
@@ -84,7 +84,7 @@ def load_data(self, **kwargs):
                 existing_docs=all_docs,
             )
             corpus.update(neg_docs)
-            relevant_docs[q_id] = {k: 1 for k in pos_docs}
+            relevant_docs[q_id] = dict.fromkeys(pos_docs, 1)
         corpus = {
             key: doc.get("title", "") + " " + doc["text"] for key, doc in corpus.items()
         }
diff --git a/mteb/tasks/Retrieval/eng/BrightRetrieval.py b/mteb/tasks/Retrieval/eng/BrightRetrieval.py
index 35b5b2e0bb..4b91c24729 100644
--- a/mteb/tasks/Retrieval/eng/BrightRetrieval.py
+++ b/mteb/tasks/Retrieval/eng/BrightRetrieval.py
@@ -37,11 +37,9 @@ def load_bright_data(
     cache_dir: str | None = None,
     revision: str | None = None,
 ):
-    corpus = {domain: {split: None for split in eval_splits} for domain in DOMAINS}
-    queries = {domain: {split: None for split in eval_splits} for domain in DOMAINS}
-    relevant_docs = {
-        domain: {split: None for split in eval_splits} for domain in DOMAINS
-    }
+    corpus = {domain: dict.fromkeys(eval_splits) for domain in DOMAINS}
+    queries = {domain: dict.fromkeys(eval_splits) for domain in DOMAINS}
+    relevant_docs = {domain: dict.fromkeys(eval_splits) for domain in DOMAINS}
 
     for domain in domains:
         domain_corpus = datasets.load_dataset(
diff --git a/mteb/tasks/Retrieval/multilingual/CUREv1Retrieval.py b/mteb/tasks/Retrieval/multilingual/CUREv1Retrieval.py
index 6e97786a77..1492123e0c 100644
--- a/mteb/tasks/Retrieval/multilingual/CUREv1Retrieval.py
+++ b/mteb/tasks/Retrieval/multilingual/CUREv1Retrieval.py
@@ -120,15 +120,9 @@ def load_data(self, **kwargs):
         cache_dir = kwargs.get("cache_dir", None)
 
         # Iterate over splits and languages
-        corpus = {
-            language: {split: None for split in eval_splits} for language in languages
-        }
-        queries = {
-            language: {split: None for split in eval_splits} for language in languages
-        }
-        relevant_docs = {
-            language: {split: None for split in eval_splits} for language in languages
-        }
+        corpus = {language: dict.fromkeys(eval_splits) for language in languages}
+        queries = {language: dict.fromkeys(eval_splits) for language in languages}
+        relevant_docs = {language: dict.fromkeys(eval_splits) for language in languages}
         for split in eval_splits:
             # Since this is a cross-lingual dataset, the corpus and the relevant documents do not depend on the language
             split_corpus = self._load_corpus(split=split, cache_dir=cache_dir)
diff --git a/mteb/tasks/Retrieval/multilingual/MIRACLRetrieval.py b/mteb/tasks/Retrieval/multilingual/MIRACLRetrieval.py
index d32d4d4cbd..2942593b28 100644
--- a/mteb/tasks/Retrieval/multilingual/MIRACLRetrieval.py
+++ b/mteb/tasks/Retrieval/multilingual/MIRACLRetrieval.py
@@ -39,9 +39,9 @@ def _load_miracl_data(
     revision: str | None = None,
     trust_remote_code: bool = False,
 ):
-    corpus = {lang: {split: None for split in splits} for lang in langs}
-    queries = {lang: {split: None for split in splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(splits) for lang in langs}
+    queries = {lang: dict.fromkeys(splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(splits) for lang in langs}
 
     split = _EVAL_SPLIT
 
@@ -170,9 +170,9 @@ def _load_miracl_data_hard_negatives(
     revision: str | None = None,
     trust_remote_code: bool = False,
 ) -> tuple:
-    corpus = {lang: {split: None for split in splits} for lang in langs}
-    queries = {lang: {split: None for split in splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(splits) for lang in langs}
+    queries = {lang: dict.fromkeys(splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(splits) for lang in langs}
 
     split = _EVAL_SPLIT
 
diff --git a/mteb/tasks/Retrieval/multilingual/MultiLongDocRetrieval.py b/mteb/tasks/Retrieval/multilingual/MultiLongDocRetrieval.py
index e143dac611..17943d14ac 100644
--- a/mteb/tasks/Retrieval/multilingual/MultiLongDocRetrieval.py
+++ b/mteb/tasks/Retrieval/multilingual/MultiLongDocRetrieval.py
@@ -32,9 +32,9 @@ def load_mldr_data(
     cache_dir: str = None,
     revision: str = None,
 ):
-    corpus = {lang: {split: None for split in eval_splits} for lang in langs}
-    queries = {lang: {split: None for split in eval_splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in eval_splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    queries = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(eval_splits) for lang in langs}
 
     for lang in langs:
         lang_corpus = datasets.load_dataset(
diff --git a/mteb/tasks/Retrieval/multilingual/NeuCLIR2022Retrieval.py b/mteb/tasks/Retrieval/multilingual/NeuCLIR2022Retrieval.py
index 865473c0dc..efb55a0ea2 100644
--- a/mteb/tasks/Retrieval/multilingual/NeuCLIR2022Retrieval.py
+++ b/mteb/tasks/Retrieval/multilingual/NeuCLIR2022Retrieval.py
@@ -24,9 +24,9 @@ def load_neuclir_data(
     cache_dir: str | None = None,
     revision: str | None = None,
 ):
-    corpus = {lang: {split: None for split in eval_splits} for lang in langs}
-    queries = {lang: {split: None for split in eval_splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in eval_splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    queries = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(eval_splits) for lang in langs}
 
     for lang in langs:
         lang_corpus = datasets.load_dataset(
@@ -112,9 +112,9 @@ def load_neuclir_data_hard_negatives(
     revision: str | None = None,
 ):
     split = "test"
-    corpus = {lang: {split: None for split in eval_splits} for lang in langs}
-    queries = {lang: {split: None for split in eval_splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in eval_splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    queries = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(eval_splits) for lang in langs}
 
     for lang in langs:
         corpus_identifier = f"corpus-{lang}"
diff --git a/mteb/tasks/Retrieval/multilingual/NeuCLIR2023Retrieval.py b/mteb/tasks/Retrieval/multilingual/NeuCLIR2023Retrieval.py
index f28198b474..7786d95f35 100644
--- a/mteb/tasks/Retrieval/multilingual/NeuCLIR2023Retrieval.py
+++ b/mteb/tasks/Retrieval/multilingual/NeuCLIR2023Retrieval.py
@@ -24,9 +24,9 @@ def load_neuclir_data(
     cache_dir: str | None = None,
     revision: str | None = None,
 ):
-    corpus = {lang: {split: None for split in eval_splits} for lang in langs}
-    queries = {lang: {split: None for split in eval_splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in eval_splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    queries = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(eval_splits) for lang in langs}
 
     for lang in langs:
         lang_corpus = datasets.load_dataset(
@@ -113,9 +113,9 @@ def load_neuclir_data_hard_negatives(
     revision: str | None = None,
 ):
     split = "test"
-    corpus = {lang: {split: None for split in eval_splits} for lang in langs}
-    queries = {lang: {split: None for split in eval_splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in eval_splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    queries = {lang: dict.fromkeys(eval_splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(eval_splits) for lang in langs}
 
     for lang in langs:
         corpus_identifier = f"corpus-{lang}"
diff --git a/mteb/tasks/Retrieval/multilingual/WebFAQRetrieval.py b/mteb/tasks/Retrieval/multilingual/WebFAQRetrieval.py
index 64e5646396..635de330b7 100644
--- a/mteb/tasks/Retrieval/multilingual/WebFAQRetrieval.py
+++ b/mteb/tasks/Retrieval/multilingual/WebFAQRetrieval.py
@@ -65,9 +65,9 @@
 def _load_webfaq_data(
     path: str, langs: list, splits: str, cache_dir: str = None, revision: str = None
 ):
-    corpus = {lang: {split: None for split in splits} for lang in langs}
-    queries = {lang: {split: None for split in splits} for lang in langs}
-    relevant_docs = {lang: {split: None for split in splits} for lang in langs}
+    corpus = {lang: dict.fromkeys(splits) for lang in langs}
+    queries = {lang: dict.fromkeys(splits) for lang in langs}
+    relevant_docs = {lang: dict.fromkeys(splits) for lang in langs}
 
     split = _EVAL_SPLIT
 
diff --git a/mteb/tasks/Retrieval/multilingual/XMarketRetrieval.py b/mteb/tasks/Retrieval/multilingual/XMarketRetrieval.py
index f630009419..4dee4bad61 100644
--- a/mteb/tasks/Retrieval/multilingual/XMarketRetrieval.py
+++ b/mteb/tasks/Retrieval/multilingual/XMarketRetrieval.py
@@ -54,7 +54,7 @@ def _load_xmarket_data(
         corpus[lang][split] = {row["_id"]: row for row in corpus_rows}
         queries[lang][split] = {row["_id"]: row["text"] for row in query_rows}
         relevant_docs[lang][split] = {
-            row["_id"]: {v: 1 for v in row["text"].split(" ")} for row in qrels_rows
+            row["_id"]: dict.fromkeys(row["text"].split(" "), 1) for row in qrels_rows
         }
 
     corpus = datasets.DatasetDict(corpus)
diff --git a/mteb/tasks/Retrieval/spa/SpanishPassageRetrievalS2P.py b/mteb/tasks/Retrieval/spa/SpanishPassageRetrievalS2P.py
index 79e0f59d01..7685bc0bf7 100644
--- a/mteb/tasks/Retrieval/spa/SpanishPassageRetrievalS2P.py
+++ b/mteb/tasks/Retrieval/spa/SpanishPassageRetrievalS2P.py
@@ -83,7 +83,8 @@ def load_data(self, **kwargs):
         self.corpus = {"test": {row["_id"]: row for row in corpus_rows}}
         self.relevant_docs = {
             "test": {
-                row["_id"]: {v: 1 for v in row["text"].split(" ")} for row in qrels_rows
+                row["_id"]: dict.fromkeys(row["text"].split(" "), 1)
+                for row in qrels_rows
             }
         }
 
diff --git a/mteb/tasks/Retrieval/spa/SpanishPassageRetrievalS2S.py b/mteb/tasks/Retrieval/spa/SpanishPassageRetrievalS2S.py
index f22739e2a1..31ada1167c 100644
--- a/mteb/tasks/Retrieval/spa/SpanishPassageRetrievalS2S.py
+++ b/mteb/tasks/Retrieval/spa/SpanishPassageRetrievalS2S.py
@@ -80,7 +80,8 @@ def load_data(self, **kwargs):
         self.corpus = {"test": {row["_id"]: row for row in corpus_rows}}
         self.relevant_docs = {
             "test": {
-                row["_id"]: {v: 1 for v in row["text"].split(" ")} for row in qrels_rows
+                row["_id"]: dict.fromkeys(row["text"].split(" "), 1)
+                for row in qrels_rows
             }
         }
 
diff --git a/pyproject.toml b/pyproject.toml
index 89c221d1d0..e2cf0da12c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,7 +54,7 @@ mteb = "mteb.cli:main"
 [project.optional-dependencies]
 image = ["torchvision>0.2.1"]
 dev = [
-"ruff==0.9.7", # locked so we don't get PRs which fail only due to a lint update
+"ruff==0.11.13", # locked so we don't get PRs which fail only due to a lint update
 "pytest>=8.3.4",
 "pytest-xdist>=3.6.1",
 "pytest-coverage>=0.0",
diff --git a/tests/test_reproducible_workflow.py b/tests/test_reproducible_workflow.py
index ffc892c44b..d584a98852 100644
--- a/tests/test_reproducible_workflow.py
+++ b/tests/test_reproducible_workflow.py
@@ -55,7 +55,7 @@ def test_validate_task_to_prompt_name(task_name: str | mteb.AbsTask):
     else:
         task_names = [task_name]
 
-    model_prompts = {task_name: "prompt_name" for task_name in task_names}
+    model_prompts = dict.fromkeys(task_names, "prompt_name")
     model_prompts |= {task_name + "-query": "prompt_name" for task_name in task_names}
     model_prompts |= {task_name + "-passage": "prompt_name" for task_name in task_names}
     model_prompts |= {