diff --git a/server/poetry.lock b/server/poetry.lock
index eef712c7d..80e463e1c 100644
--- a/server/poetry.lock
+++ b/server/poetry.lock
@@ -3050,29 +3050,29 @@ pyasn1 = ">=0.1.3"
 
 [[package]]
 name = "ruff"
-version = "0.8.6"
+version = "0.9.1"
 description = "An extremely fast Python linter and code formatter, written in Rust."
 optional = false
 python-versions = ">=3.7"
 files = [
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-    {file = "ruff-0.8.6-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:54799ca3d67ae5e0b7a7ac234baa657a9c1784b48ec954a094da7c206e0365b1"},
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-    {file = "ruff-0.8.6-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:7ae4478b1471fc0c44ed52a6fb787e641a2ac58b1c1f91763bafbc2faddc5117"},
-    {file = "ruff-0.8.6-py3-none-musllinux_1_2_aarch64.whl", hash = "sha256:0c000a471d519b3e6cfc9c6680025d923b4ca140ce3e4612d1a2ef58e11f11fe"},
-    {file = "ruff-0.8.6-py3-none-musllinux_1_2_armv7l.whl", hash = "sha256:9257aa841e9e8d9b727423086f0fa9a86b6b420fbf4bf9e1465d1250ce8e4d8d"},
-    {file = "ruff-0.8.6-py3-none-musllinux_1_2_i686.whl", hash = "sha256:45a56f61b24682f6f6709636949ae8cc82ae229d8d773b4c76c09ec83964a95a"},
-    {file = "ruff-0.8.6-py3-none-musllinux_1_2_x86_64.whl", hash = "sha256:496dd38a53aa173481a7d8866bcd6451bd934d06976a2505028a50583e001b76"},
-    {file = "ruff-0.8.6-py3-none-win32.whl", hash = "sha256:e169ea1b9eae61c99b257dc83b9ee6c76f89042752cb2d83486a7d6e48e8f764"},
-    {file = "ruff-0.8.6-py3-none-win_amd64.whl", hash = "sha256:f1d70bef3d16fdc897ee290d7d20da3cbe4e26349f62e8a0274e7a3f4ce7a905"},
-    {file = "ruff-0.8.6-py3-none-win_arm64.whl", hash = "sha256:7d7fc2377a04b6e04ffe588caad613d0c460eb2ecba4c0ccbbfe2bc973cbc162"},
-    {file = "ruff-0.8.6.tar.gz", hash = "sha256:dcad24b81b62650b0eb8814f576fc65cfee8674772a6e24c9b747911801eeaa5"},
+    {file = "ruff-0.9.1-py3-none-linux_armv6l.whl", hash = "sha256:84330dda7abcc270e6055551aca93fdde1b0685fc4fd358f26410f9349cf1743"},
+    {file = "ruff-0.9.1-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:3cae39ba5d137054b0e5b472aee3b78a7c884e61591b100aeb544bcd1fc38d4f"},
+    {file = "ruff-0.9.1-py3-none-macosx_11_0_arm64.whl", hash = "sha256:50c647ff96f4ba288db0ad87048257753733763b409b2faf2ea78b45c8bb7fcb"},
+    {file = "ruff-0.9.1-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:f0c8b149e9c7353cace7d698e1656ffcf1e36e50f8ea3b5d5f7f87ff9986a7ca"},
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+    {file = "ruff-0.9.1-py3-none-manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:39d0174ccc45c439093971cc06ed3ac4dc545f5e8bdacf9f067adf879544d969"},
+    {file = "ruff-0.9.1-py3-none-manylinux_2_17_ppc64.manylinux2014_ppc64.whl", hash = "sha256:69572926c0f0c9912288915214ca9b2809525ea263603370b9e00bed2ba56dbd"},
+    {file = "ruff-0.9.1-py3-none-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:937267afce0c9170d6d29f01fcd1f4378172dec6760a9f4dface48cdabf9610a"},
+    {file = "ruff-0.9.1-py3-none-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:186c2313de946f2c22bdf5954b8dd083e124bcfb685732cfb0beae0c47233d9b"},
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+    {file = "ruff-0.9.1-py3-none-musllinux_1_2_aarch64.whl", hash = "sha256:728d791b769cc28c05f12c280f99e8896932e9833fef1dd8756a6af2261fd1ab"},
+    {file = "ruff-0.9.1-py3-none-musllinux_1_2_armv7l.whl", hash = "sha256:2f312c86fb40c5c02b44a29a750ee3b21002bd813b5233facdaf63a51d9a85e1"},
+    {file = "ruff-0.9.1-py3-none-musllinux_1_2_i686.whl", hash = "sha256:ae017c3a29bee341ba584f3823f805abbe5fe9cd97f87ed07ecbf533c4c88366"},
+    {file = "ruff-0.9.1-py3-none-musllinux_1_2_x86_64.whl", hash = "sha256:5dc40a378a0e21b4cfe2b8a0f1812a6572fc7b230ef12cd9fac9161aa91d807f"},
+    {file = "ruff-0.9.1-py3-none-win32.whl", hash = "sha256:46ebf5cc106cf7e7378ca3c28ce4293b61b449cd121b98699be727d40b79ba72"},
+    {file = "ruff-0.9.1-py3-none-win_amd64.whl", hash = "sha256:342a824b46ddbcdddd3abfbb332fa7fcaac5488bf18073e841236aadf4ad5c19"},
+    {file = "ruff-0.9.1-py3-none-win_arm64.whl", hash = "sha256:1cd76c7f9c679e6e8f2af8f778367dca82b95009bc7b1a85a47f1521ae524fa7"},
+    {file = "ruff-0.9.1.tar.gz", hash = "sha256:fd2b25ecaf907d6458fa842675382c8597b3c746a2dde6717fe3415425df0c17"},
 ]
 
 [[package]]
@@ -3682,4 +3682,4 @@ pypika = ["PyPika"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.11, <3.13"
-content-hash = "8959e4d9688a642b3b826467cdbfd9123fdf635d46ee81d7d86a761d86bcf15e"
+content-hash = "2de8d793a0a166c63ab738b88d1d56590e35ecd831d695f7e5e07924db1da1ac"
diff --git a/server/pyproject.toml b/server/pyproject.toml
index a20a5c768..460d08a42 100644
--- a/server/pyproject.toml
+++ b/server/pyproject.toml
@@ -75,7 +75,7 @@ psycopg2 = "^2.9.7"
 pymongo = ">=4.2.0"
 PyYAML = "^6.0"
 redshift-connector = "^2.1.3"
-ruff = ">=0.5.0,<0.9"
+ruff = ">=0.5.0,<0.10"
 pre-commit = ">=3.4,<5.0"
 tenacity = ">=8.4.2,<10.0.0"
 
diff --git a/server/src/weaverbird/backends/mongo_translator/steps/percentage.py b/server/src/weaverbird/backends/mongo_translator/steps/percentage.py
index 63dccd1cd..970671f16 100644
--- a/server/src/weaverbird/backends/mongo_translator/steps/percentage.py
+++ b/server/src/weaverbird/backends/mongo_translator/steps/percentage.py
@@ -8,7 +8,7 @@ def translate_percentage(step: PercentageStep) -> list[MongoStep]:
             "$group": {
                 "_id": {g: f"${g}" for g in step.group} if step.group else None,
                 "_vqbAppArray": {"$push": "$$ROOT"},
-                "_vqbTotalDenum": {"$sum": f"${step.column }"},
+                "_vqbTotalDenum": {"$sum": f"${step.column}"},
             },
         },
         {"$unwind": "$_vqbAppArray"},
diff --git a/server/src/weaverbird/backends/mongo_translator/steps/todate.py b/server/src/weaverbird/backends/mongo_translator/steps/todate.py
index 3bad4d82a..106f8cfd0 100644
--- a/server/src/weaverbird/backends/mongo_translator/steps/todate.py
+++ b/server/src/weaverbird/backends/mongo_translator/steps/todate.py
@@ -179,7 +179,7 @@ def translate_todate(step: ToDateStep) -> list[MongoStep]:
 
 MONTH_REPLACEMENT_STEP: MongoStep = {
     "$addFields": {
-        "_vqbTempMonth" "$switch": {
+        "_vqbTempMonth$switch": {
             "branches": [
                 {
                     "case": {"$in": month_names},
diff --git a/server/src/weaverbird/backends/pypika_translator/translators/base.py b/server/src/weaverbird/backends/pypika_translator/translators/base.py
index cb42d269d..ab6588912 100644
--- a/server/src/weaverbird/backends/pypika_translator/translators/base.py
+++ b/server/src/weaverbird/backends/pypika_translator/translators/base.py
@@ -348,9 +348,9 @@ def get_query_builder(
     ) -> QueryBuilderContext:
         if len(steps) <= 0:
             raise ValueError("No steps provided")
-        assert (
-            steps[0].name == "domain" or steps[0].name == "customsql"
-        ), f"First step must be one of domain or customsql step, got '{steps[0].name}'"
+        assert steps[0].name == "domain" or steps[0].name == "customsql", (
+            f"First step must be one of domain or customsql step, got '{steps[0].name}'"
+        )
         self._step_count = 0
 
         # A single custom SQL step must always be wrapped in a CTE, as we cannot apply offset and
diff --git a/server/tests/backends/mongo_translator/steps/test_evolution.py b/server/tests/backends/mongo_translator/steps/test_evolution.py
index 55c88eb35..147204673 100644
--- a/server/tests/backends/mongo_translator/steps/test_evolution.py
+++ b/server/tests/backends/mongo_translator/steps/test_evolution.py
@@ -65,7 +65,7 @@ def test_translate_evolution() -> None:
                 "bar_EVOL_ABS": {
                     "$cond": [
                         {"$eq": ["$_VQB_VALUE_PREV", "Error"]},
-                        "Error: More than one previous " "date found for the specified " "index columns",
+                        "Error: More than one previous date found for the specified index columns",
                         {"$subtract": ["$bar", "$_VQB_VALUE_PREV"]},
                     ]
                 }
diff --git a/server/tests/backends/sql_translator_integration_tests/test_sql_mysql_translator_steps.py b/server/tests/backends/sql_translator_integration_tests/test_sql_mysql_translator_steps.py
index 0dc66ef32..391fc4b37 100644
--- a/server/tests/backends/sql_translator_integration_tests/test_sql_mysql_translator_steps.py
+++ b/server/tests/backends/sql_translator_integration_tests/test_sql_mysql_translator_steps.py
@@ -29,7 +29,7 @@
     "port": 3306,
     "database": "mysql_db",
 }
-_CONNECTION_STRING = f'mysql+pymysql://{_CON_PARAMS["user"]}:{_CON_PARAMS["password"]}@{_CON_PARAMS["host"]}:{_CON_PARAMS["port"]}/{_CON_PARAMS["database"]}'
+_CONNECTION_STRING = f"mysql+pymysql://{_CON_PARAMS['user']}:{_CON_PARAMS['password']}@{_CON_PARAMS['host']}:{_CON_PARAMS['port']}/{_CON_PARAMS['database']}"
 
 
 @pytest.fixture(scope="module")
diff --git a/server/tests/backends/sql_translator_integration_tests/test_sql_postgres_translator_steps.py b/server/tests/backends/sql_translator_integration_tests/test_sql_postgres_translator_steps.py
index e5d660c21..7672c45a4 100644
--- a/server/tests/backends/sql_translator_integration_tests/test_sql_postgres_translator_steps.py
+++ b/server/tests/backends/sql_translator_integration_tests/test_sql_postgres_translator_steps.py
@@ -29,7 +29,7 @@
     "port": 5432,
     "database": "pg_db",
 }
-connection_string = f'postgresql://{con_params["user"]}:{con_params["password"]}@{con_params["host"]}:{con_params["port"]}/{con_params["database"]}'
+connection_string = f"postgresql://{con_params['user']}:{con_params['password']}@{con_params['host']}:{con_params['port']}/{con_params['database']}"
 
 
 @pytest.fixture(scope="module")
diff --git a/server/tests/steps/test_top.py b/server/tests/steps/test_top.py
index ce9d4a038..72882eaea 100644
--- a/server/tests/steps/test_top.py
+++ b/server/tests/steps/test_top.py
@@ -13,7 +13,7 @@
 def sample_df():
     return DataFrame(
         {
-            "Label": [f"Label {i+1}" for i in range(6)],
+            "Label": [f"Label {i + 1}" for i in range(6)],
             "Group": ["Group 1"] * 3 + ["Group 2"] * 3,
             "Value": [13, 7, 20, 1, 10, 5],
         }