diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 1fd11f86d..06401f051 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -49,8 +49,6 @@ repos:
           - types-requests
           - types-python-dateutil
           - types-croniter
-          - types-aiobotocore[essential]
-          - boto3-stubs[essential]
         exclude: ^(diracx-client/src/diracx/client/_generated|diracx-[a-z]+/tests/|diracx-testing/|build|extensions/gubbins/gubbins-client/src/gubbins/client/_generated)
 
   - repo: https://github.com/hukkin/mdformat
diff --git a/diracx-core/pyproject.toml b/diracx-core/pyproject.toml
index 720968401..4e31ab77e 100644
--- a/diracx-core/pyproject.toml
+++ b/diracx-core/pyproject.toml
@@ -13,8 +13,6 @@ classifiers = [
     "Topic :: System :: Distributed Computing",
 ]
 dependencies = [
-    "aiobotocore>=2.15",
-    "botocore>=1.35",
     "cachetools",
     "email_validator",
     "gitpython",
@@ -23,6 +21,7 @@ dependencies = [
     "pydantic-settings",
     "pyyaml",
     "sh",
+    "signurlarity >=0.2.2",
     "diraccommon >=9.0.18",
 ]
 dynamic = ["version"]
@@ -33,9 +32,6 @@ testing = [
     "moto[server]",
 ]
 types = [
-    "botocore-stubs",
-    "types-aiobotocore[essential]",
-    "types-aiobotocore-s3",
     "types-cachetools",
     "types-PyYAML",
 ]
diff --git a/diracx-core/src/diracx/core/s3.py b/diracx-core/src/diracx/core/s3.py
index afc0c9d20..bcebf5f9f 100644
--- a/diracx-core/src/diracx/core/s3.py
+++ b/diracx-core/src/diracx/core/s3.py
@@ -13,14 +13,14 @@
 import base64
 from typing import TYPE_CHECKING, TypedDict, cast
 
-from botocore.errorfactory import ClientError
+from signurlarity.exceptions import NoSuchBucketError, PresignError
 
 from .models.sandbox import ChecksumAlgorithm
 
 if TYPE_CHECKING:
     from typing import TypedDict
 
-    from types_aiobotocore_s3.client import S3Client
+    from signurlarity.aio.client import AsyncClient
 
     class S3Object(TypedDict):
         Key: str
@@ -31,12 +31,12 @@ class S3PresignedPostInfo(TypedDict):
     fields: dict[str, str]
 
 
-async def s3_bucket_exists(s3_client: S3Client, bucket_name: str) -> bool:
+async def s3_bucket_exists(s3_client: AsyncClient, bucket_name: str) -> bool:
     """Check if a bucket exists in S3."""
     return await _s3_exists(s3_client.head_bucket, Bucket=bucket_name)
 
 
-async def s3_object_exists(s3_client: S3Client, bucket_name: str, key: str) -> bool:
+async def s3_object_exists(s3_client: AsyncClient, bucket_name: str, key: str) -> bool:
     """Check if an object exists in an S3 bucket."""
     return await _s3_exists(s3_client.head_object, Bucket=bucket_name, Key=key)
 
@@ -44,16 +44,46 @@ async def s3_object_exists(s3_client: S3Client, bucket_name: str, key: str) -> b
 async def _s3_exists(method, **kwargs: str) -> bool:
     try:
         await method(**kwargs)
-    except ClientError as e:
-        if e.response["Error"]["Code"] != "404":
-            raise
+    except (NoSuchBucketError, PresignError):
+        # if e.response["Error"]["Code"] != "404":
+        #     raise
         return False
     else:
         return True
 
 
 async def generate_presigned_upload(
-    s3_client: S3Client,
+    s3_client: AsyncClient,
+    bucket_name: str,
+    key: str,
+    checksum_algorithm: ChecksumAlgorithm,
+    checksum: str,
+    size: int,
+    validity_seconds: int,
+) -> S3PresignedPostInfo:
+    """Generate a presigned URL and fields for uploading a file to S3.
+
+    The signature is restricted to only accept data with the given checksum and size.
+    """
+    fields = {
+        "x-amz-checksum-algorithm": checksum_algorithm,
+        f"x-amz-checksum-{checksum_algorithm}": b16_to_b64(checksum),
+    }
+    conditions = [["content-length-range", size, size]] + [
+        {k: v} for k, v in fields.items()
+    ]
+    result = await s3_client.generate_presigned_post(
+        Bucket=bucket_name,
+        Key=key,
+        Fields=fields,
+        Conditions=conditions,
+        ExpiresIn=validity_seconds,
+    )
+    return cast(S3PresignedPostInfo, result)
+
+
+async def generate_presigned_download(
+    s3_client: AsyncClient,
     bucket_name: str,
     key: str,
     checksum_algorithm: ChecksumAlgorithm,
@@ -126,7 +156,7 @@ async def _s3_delete_chunk_with_retry(
                 Bucket=bucket,
                 Delete={"Objects": remaining, "Quiet": True},
             )
-        except ClientError:
+        except NoSuchBucketError:
             if attempt == max_attempts:
                 return {obj["Key"] for obj in remaining}
             await asyncio.sleep(delay)
diff --git a/diracx-core/src/diracx/core/settings.py b/diracx-core/src/diracx/core/settings.py
index 40c75afd2..93a292975 100644
--- a/diracx-core/src/diracx/core/settings.py
+++ b/diracx-core/src/diracx/core/settings.py
@@ -18,9 +18,6 @@
 from pathlib import Path
 from typing import TYPE_CHECKING, Annotated, Any, Self, TypeVar, cast
 
-from aiobotocore.session import get_session
-from botocore.config import Config
-from botocore.errorfactory import ClientError
 from cryptography.fernet import Fernet
 from joserfc.jwk import KeySet, KeySetSerialization
 from pydantic import (
@@ -35,9 +32,11 @@
     model_validator,
 )
 from pydantic_settings import BaseSettings, SettingsConfigDict
+from signurlarity.aio.client import AsyncClient
+from signurlarity.exceptions import NoSuchBucketError
 
 if TYPE_CHECKING:
-    from types_aiobotocore_s3.client import S3Client
+    from signurlarity.aio.client import AsyncClient
 
 T = TypeVar("T")
 
@@ -324,17 +323,12 @@ class SandboxStoreSettings(ServiceSettingsBase):
     Controls parallelism of database DELETE operations.
     """
 
-    _client: S3Client = PrivateAttr()
+    _client: AsyncClient = PrivateAttr()
 
     @contextlib.asynccontextmanager
     async def lifetime_function(self) -> AsyncIterator[None]:
-        async with get_session().create_client(
-            "s3",
+        async with AsyncClient(
             **self.s3_client_kwargs,
-            config=Config(
-                signature_version="v4",
-                max_pool_connections=self.s3_max_pool_connections,
-            ),
         ) as self._client:  # type: ignore
             if not await s3_bucket_exists(self._client, self.bucket_name):
                 if not self.auto_create_bucket:
@@ -343,7 +337,7 @@ async def lifetime_function(self) -> AsyncIterator[None]:
                     )
                 try:
                     await self._client.create_bucket(Bucket=self.bucket_name)
-                except ClientError as e:
+                except NoSuchBucketError as e:
                     raise ValueError(
                         f"Failed to create bucket {self.bucket_name}"
                     ) from e
@@ -351,7 +345,7 @@ async def lifetime_function(self) -> AsyncIterator[None]:
             yield
 
     @property
-    def s3_client(self) -> S3Client:
+    def s3_client(self) -> AsyncClient:
         if self._client is None:
             raise RuntimeError("S3 client accessed before lifetime function")
         return self._client
diff --git a/diracx-core/tests/test_s3.py b/diracx-core/tests/test_s3.py
index 42f6ea022..c7b44e764 100644
--- a/diracx-core/tests/test_s3.py
+++ b/diracx-core/tests/test_s3.py
@@ -7,7 +7,7 @@
 
 import httpx
 import pytest
-from aiobotocore.session import get_session
+from signurlarity.aio.client import AsyncClient
 
 from diracx.core.s3 import (
     b16_to_b64,
@@ -52,7 +52,7 @@ async def moto_s3(aio_moto):
     Note that this is not a complete S3 backend, in particular authentication
     and validation of requests is not implemented.
     """
-    async with get_session().create_client("s3", **aio_moto) as client:
+    async with AsyncClient(**aio_moto) as client:
         await client.create_bucket(Bucket=BUCKET_NAME)
         await client.create_bucket(Bucket=OTHER_BUCKET_NAME)
         yield client
@@ -92,15 +92,23 @@ async def test_presigned_upload_moto(moto_s3):
     assert r.status_code == 204, r.text
 
     # Make sure the object is actually there
-    obj = await moto_s3.get_object(Bucket=BUCKET_NAME, Key=key)
-    assert (await obj["Body"].read()) == file_content
+    url = await moto_s3.generate_presigned_url(
+        "get_object",
+        Params={"Bucket": BUCKET_NAME, "Key": key},
+        ExpiresIn=3600,
+    )
+    async with httpx.AsyncClient() as client:
+        r = await client.get(
+            url,
+        )
+
+    assert r.content == file_content
 
 
 @pytest.fixture(scope="function")
 async def minio_client(demo_urls):
     """Create a S3 client that uses minio from the demo as backend."""
-    async with get_session().create_client(
-        "s3",
+    async with AsyncClient(
         endpoint_url=demo_urls["minio"],
         aws_access_key_id="console",
         aws_secret_access_key="console123",
@@ -115,8 +123,14 @@ async def test_bucket(minio_client):
     await minio_client.create_bucket(Bucket=bucket_name)
     yield bucket_name
     objects = await minio_client.list_objects(Bucket=bucket_name)
-    for obj in objects.get("Contents", []):
-        await minio_client.delete_object(Bucket=bucket_name, Key=obj["Key"])
+    if objects.get("Contents", []):
+        await minio_client.delete_objects(
+            Bucket=bucket_name,
+            Delete={
+                "Objects": [{"Key": obj["Key"]} for obj in objects.get("Contents", [])]
+            },
+        )
+
     await minio_client.delete_bucket(Bucket=bucket_name)
 
 
diff --git a/diracx-logic/tests/jobs/test_sandboxes.py b/diracx-logic/tests/jobs/test_sandboxes.py
index 6dc59197d..0dc3ddce9 100644
--- a/diracx-logic/tests/jobs/test_sandboxes.py
+++ b/diracx-logic/tests/jobs/test_sandboxes.py
@@ -6,10 +6,10 @@
 from io import BytesIO
 from typing import AsyncGenerator, Generator
 
-import botocore.exceptions
 import freezegun
 import httpx
 import pytest
+import signurlarity.exceptions
 import sqlalchemy
 
 from diracx.core.exceptions import SandboxNotFoundError
@@ -142,7 +142,10 @@ async def test_upload_and_clean(
     await clean_sandboxes(sandbox_metadata_db, sandbox_settings)
 
     # Check that the sandbox was actually removed from the bucket
-    with pytest.raises(botocore.exceptions.ClientError, match="Not Found"):
+    with pytest.raises(
+        signurlarity.exceptions.PresignError,
+        match="does not exist or is not accessible",
+    ):
         await sandbox_settings.s3_client.head_object(
             Bucket=sandbox_settings.bucket_name, Key=key
         )
diff --git a/extensions/gubbins/gubbins-logic/pyproject.toml b/extensions/gubbins/gubbins-logic/pyproject.toml
index af465c4b2..4f7c9a3de 100644
--- a/extensions/gubbins/gubbins-logic/pyproject.toml
+++ b/extensions/gubbins/gubbins-logic/pyproject.toml
@@ -23,9 +23,6 @@ dynamic = ["version"]
 [project.optional-dependencies]
 testing = []
 types = [
-    "boto3-stubs",
-    "types-aiobotocore[essential]",
-    "types-aiobotocore-s3",
     "types-cachetools",
     "types-python-dateutil",
     "types-PyYAML",
diff --git a/extensions/gubbins/gubbins-routers/pyproject.toml b/extensions/gubbins/gubbins-routers/pyproject.toml
index ffc5313e4..e339729e1 100644
--- a/extensions/gubbins/gubbins-routers/pyproject.toml
+++ b/extensions/gubbins/gubbins-routers/pyproject.toml
@@ -23,9 +23,6 @@ dynamic = ["version"]
 [project.optional-dependencies]
 testing = ["diracx-testing", "moto[server]", "pytest-httpx"]
 types = [
-    "boto3-stubs",
-    "types-aiobotocore[essential]",
-    "types-aiobotocore-s3",
     "types-cachetools",
     "types-python-dateutil",
     "types-PyYAML",