diff --git a/dataframely/_compat.py b/dataframely/_compat.py
index 60e3349c..7fe418a0 100644
--- a/dataframely/_compat.py
+++ b/dataframely/_compat.py
@@ -80,10 +80,14 @@ class Dialect:  # type: ignore # noqa: N801
     from polars._typing import (  # type: ignore[attr-defined,unused-ignore]
         PartitioningScheme as PartitionSchemeOrSinkDirectory,
     )
-else:
+elif _polars_version_tuple < (1, 38):  # pragma: no cover
     from polars.io.partition import (  # type: ignore[no-redef,attr-defined,unused-ignore]
         _SinkDirectory as PartitionSchemeOrSinkDirectory,
     )
+else:
+    from polars.io.partition import (  # type: ignore[no-redef,attr-defined,unused-ignore]
+        PartitionBy as PartitionSchemeOrSinkDirectory,
+    )
 
 # ------------------------------------------------------------------------------------ #
 
diff --git a/dataframely/_storage/__init__.py b/dataframely/_storage/__init__.py
index 780ec798..25528ddc 100644
--- a/dataframely/_storage/__init__.py
+++ b/dataframely/_storage/__init__.py
@@ -2,7 +2,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
 
 from ._base import StorageBackend
+from ._fsspec import get_file_prefix
 
-__all__ = [
-    "StorageBackend",
-]
+__all__ = ["StorageBackend", "get_file_prefix"]
diff --git a/dataframely/_storage/_fsspec.py b/dataframely/_storage/_fsspec.py
new file mode 100644
index 00000000..e0aa3a4a
--- /dev/null
+++ b/dataframely/_storage/_fsspec.py
@@ -0,0 +1,18 @@
+# Copyright (c) QuantCo 2025-2026
+# SPDX-License-Identifier: BSD-3-Clause
+
+from fsspec import AbstractFileSystem
+
+
+def get_file_prefix(fs: AbstractFileSystem) -> str:
+    match fs.protocol:
+        case "file":
+            return ""
+        case str():
+            return f"{fs.protocol}://"
+        case ["file", *_]:
+            return ""
+        case [str(proto), *_]:
+            return f"{proto}://"
+        case _:
+            raise ValueError(f"Unexpected fs.protocol: {fs.protocol}")
diff --git a/dataframely/_storage/parquet.py b/dataframely/_storage/parquet.py
index fc8ba46c..655c5956 100644
--- a/dataframely/_storage/parquet.py
+++ b/dataframely/_storage/parquet.py
@@ -7,6 +7,8 @@
 import polars as pl
 from fsspec import AbstractFileSystem, url_to_fs
 
+from dataframely._storage import get_file_prefix
+
 from ._base import (
     SerializedCollection,
     SerializedRules,
@@ -79,7 +81,9 @@ def sink_collection(
         fs: AbstractFileSystem = url_to_fs(path)[0]
         for key, lf in dfs.items():
             destination = (
-                fs.sep.join([path, key])
+                # Enforce that the path ends with a separator. Otherwise
+                # polars misbehaves on Windows.
+                fs.sep.join([path, key]) + fs.sep
                 if "partition_by" in kwargs
                 else fs.sep.join([path, f"{key}.parquet"])
             )
@@ -107,7 +111,9 @@ def write_collection(
         fs: AbstractFileSystem = url_to_fs(path)[0]
         for key, lf in dfs.items():
             destination = (
-                fs.sep.join([path, key])
+                # Enforce that the path ends with a separator. Otherwise
+                # polars misbehaves on Windows.
+                fs.sep.join([path, key]) + fs.sep
                 if "partition_by" in kwargs
                 else fs.sep.join([path, f"{key}.parquet"])
             )
@@ -155,15 +161,7 @@ def _collection_from_parquet(
                 if is_file:
                     collection_types.append(_read_serialized_collection(source_path))
                 else:
-                    prefix = (
-                        ""
-                        if fs.protocol == "file"
-                        else (
-                            f"{fs.protocol}://"
-                            if isinstance(fs.protocol, str)
-                            else f"{fs.protocol[0]}://"
-                        )
-                    )
+                    prefix = get_file_prefix(fs)
                     for file in fs.glob(fs.sep.join([source_path, "**", "*.parquet"])):
                         collection_types.append(
                             _read_serialized_collection(f"{prefix}{file}")
diff --git a/dataframely/testing/storage.py b/dataframely/testing/storage.py
index e5f15593..e09c2477 100644
--- a/dataframely/testing/storage.py
+++ b/dataframely/testing/storage.py
@@ -10,6 +10,7 @@
 import dataframely as dy
 from dataframely import FailureInfo, Validation
 from dataframely._compat import deltalake
+from dataframely._storage import get_file_prefix
 from dataframely._storage.delta import _to_delta_table
 
 # ----------------------------------- Schema -------------------------------------------
@@ -190,19 +191,7 @@ def set_metadata(self, path: str, metadata: dict[str, Any]) -> None:
         metadata."""
 
     def _prefix_path(self, path: str, fs: AbstractFileSystem) -> str:
-        return f"{self._get_prefix(fs)}{path}"
-
-    @staticmethod
-    def _get_prefix(fs: AbstractFileSystem) -> str:
-        return (
-            ""
-            if fs.protocol == "file"
-            else (
-                f"{fs.protocol}://"
-                if isinstance(fs.protocol, str)
-                else f"{fs.protocol[0]}://"
-            )
-        )
+        return f"{get_file_prefix(fs)}{path}"
 
 
 class ParquetCollectionStorageTester(CollectionStorageTester):
diff --git a/pixi.lock b/pixi.lock
index d0cd283f..06db5af4 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -3,8 +3,6 @@ environments:
   build:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
-    options:
-      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -450,8 +448,6 @@ environments:
   default:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
-    options:
-      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -666,8 +662,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh145f28c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/platformdirs-4.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/linux-64/polars-runtime-32-1.36.1-py310hffdcd12_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/polars-runtime-32-1.38.0-py310hffdcd12_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-4.5.1-pyha770c72_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-hooks-5.0.0-pyhd8ed1ab_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/prettier-3.8.1-h7e4c9f4_0.conda
@@ -979,8 +975,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh145f28c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/platformdirs-4.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/polars-runtime-32-1.36.1-py310hff09b76_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/polars-runtime-32-1.38.0-py310hff09b76_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-4.5.1-pyha770c72_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-hooks-5.0.0-pyhd8ed1ab_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/prettier-3.8.1-h1e5041c_0.conda
@@ -1288,8 +1284,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh145f28c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/platformdirs-4.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/osx-64/polars-runtime-32-1.36.1-py310hfb6bc98_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-64/polars-runtime-32-1.38.0-py310had17480_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-4.5.1-pyha770c72_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-hooks-5.0.0-pyhd8ed1ab_2.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/prettier-3.8.1-h07b0e94_0.conda
@@ -1598,8 +1594,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh145f28c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/platformdirs-4.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/polars-runtime-32-1.36.1-py310h34bb384_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/polars-runtime-32-1.38.0-py310haaaf75b_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-4.5.1-pyha770c72_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-hooks-5.0.0-pyhd8ed1ab_2.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/prettier-3.8.1-h9907cc9_0.conda
@@ -1888,8 +1884,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh145f28c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/platformdirs-4.5.1-pyhcf101f3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/win-64/polars-runtime-32-1.36.1-py310hca7251b_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/polars-runtime-32-1.38.0-py310hca7251b_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-4.5.1-pyha770c72_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-hooks-5.0.0-pyhd8ed1ab_2.conda
       - conda: https://conda.anaconda.org/conda-forge/win-64/prettier-3.8.1-hc95d2ff_0.conda
@@ -1996,8 +1992,6 @@ environments:
   default-polars-minimal:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
-    options:
-      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -3542,8 +3536,6 @@ environments:
   docs:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
-    options:
-      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -4345,8 +4337,6 @@ environments:
   lint:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
-    options:
-      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -4673,8 +4663,6 @@ environments:
   nightly:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
-    options:
-      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -5681,8 +5669,6 @@ environments:
   polars-minimal:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
-    options:
-      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -6363,8 +6349,6 @@ environments:
   py310:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
-    options:
-      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -6455,8 +6439,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pathspec-1.0.4-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh8b19718_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/linux-64/polars-runtime-32-1.36.1-py310hffdcd12_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/polars-runtime-32-1.38.0-py310hffdcd12_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/propcache-0.3.1-py310h89163eb_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/psutil-7.2.2-py310h139afa4_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/py-cpuinfo-9.0.0-pyhd8ed1ab_1.conda
@@ -6596,8 +6580,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pathspec-1.0.4-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh8b19718_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/polars-runtime-32-1.36.1-py310hff09b76_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/polars-runtime-32-1.38.0-py310hff09b76_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/propcache-0.3.1-py310heeae437_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/psutil-7.2.2-py310hef25091_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/py-cpuinfo-9.0.0-pyhd8ed1ab_1.conda
@@ -6731,8 +6715,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pathspec-1.0.4-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh8b19718_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/osx-64/polars-runtime-32-1.36.1-py310hfb6bc98_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-64/polars-runtime-32-1.38.0-py310had17480_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/propcache-0.3.1-py310h8e2f543_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/psutil-7.2.2-py310h8bcfd8d_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/py-cpuinfo-9.0.0-pyhd8ed1ab_1.conda
@@ -6867,8 +6851,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pathspec-1.0.4-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh8b19718_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/polars-runtime-32-1.36.1-py310h34bb384_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-arm64/polars-runtime-32-1.38.0-py310haaaf75b_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/propcache-0.3.1-py310hc74094e_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-arm64/psutil-7.2.2-py310haea493c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/py-cpuinfo-9.0.0-pyhd8ed1ab_1.conda
@@ -7000,8 +6984,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pathspec-1.0.4-pyhd8ed1ab_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pip-26.0-pyh8b19718_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.6.0-pyhf9edf01_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.36.1-pyh6a1acc5_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/win-64/polars-runtime-32-1.36.1-py310hca7251b_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/polars-1.38.0-pyh6a1acc5_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/win-64/polars-runtime-32-1.38.0-py310hca7251b_0.conda
       - conda: https://conda.anaconda.org/conda-forge/win-64/propcache-0.3.1-py310h38315fa_0.conda
       - conda: https://conda.anaconda.org/conda-forge/win-64/psutil-7.2.2-py310h1637853_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/py-cpuinfo-9.0.0-pyhd8ed1ab_1.conda
@@ -7060,8 +7044,6 @@ environments:
   py311:
     channels:
     - url: https://conda.anaconda.org/conda-forge/
-    options:
-      pypi-prerelease-mode: if-necessary-or-explicit
     packages:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
@@ -7151,8 +7133,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/noarch/pathspec-1.0.4-pyhd8ed1ab_0.conda
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-  - polars-runtime-64 ==1.36.1
-  - polars-runtime-compat ==1.36.1
+  - polars-runtime-32 ==1.37.1
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-  - polars-runtime-64 ==1.37.1
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+  - polars-runtime-compat ==1.38.0
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-  sha256: 3ab320a6175732165f9e14c447ab766e221322bb0c74c78b4eab8b60246c7032
-  md5: a466731fdecd70299823349a913731c2
+  sha256: d1ef07dfe8647173d31165de5943be447d9da4b7a8956ebbd99b6dea2a3c1951
+  md5: 75e808381cab0c33008317fd25ba8157
   depends:
   - python
   - libcxx >=19
@@ -24054,12 +24025,12 @@ packages:
   - __osx >=10.13
   license: MIT
   license_family: MIT
-  size: 34227518
-  timestamp: 1765344423449
-- conda: https://conda.anaconda.org/conda-forge/osx-64/polars-runtime-32-1.37.1-py310had17480_0.conda
+  size: 35492736
+  timestamp: 1768303924189
+- conda: https://conda.anaconda.org/conda-forge/osx-64/polars-runtime-32-1.38.0-py310had17480_0.conda
   noarch: python
-  sha256: d1ef07dfe8647173d31165de5943be447d9da4b7a8956ebbd99b6dea2a3c1951
-  md5: 75e808381cab0c33008317fd25ba8157
+  sha256: 3bb3b212765275943f8a42a05c07d45a10e6c5a2048d4e3a9c4fed4966d71f13
+  md5: f56bc2c3eb5a827a4bb901b840565773
   depends:
   - python
   - libcxx >=19
@@ -24069,9 +24040,8 @@ packages:
   constrains:
   - __osx >=10.13
   license: MIT
-  license_family: MIT
-  size: 35492736
-  timestamp: 1768303924189
+  size: 35862455
+  timestamp: 1770222292049
 - conda: https://conda.anaconda.org/conda-forge/osx-arm64/polars-runtime-32-1.35.2-py310h34bb384_0.conda
   noarch: python
   sha256: 3f1b00a0ee4e56edfe272d60d51b3c243abeb1e0f872288182ef82d60f7c0d7b
@@ -24088,10 +24058,10 @@ packages:
   license_family: MIT
   size: 30029154
   timestamp: 1763738030442
-- conda: https://conda.anaconda.org/conda-forge/osx-arm64/polars-runtime-32-1.36.1-py310h34bb384_0.conda
+- conda: https://conda.anaconda.org/conda-forge/osx-arm64/polars-runtime-32-1.37.1-py310haaaf75b_0.conda
   noarch: python
-  sha256: e9ab1c2833fc368bcbc27c214cbc5123f16cb243dfcb07aaf0bc060638a17ea0
-  md5: 4cc0693aae853723df55150875a2d602
+  sha256: 1c79affdb6f0fcb466d1116ebeb56edb57510549f87351550a6f96f2211d5d2b
+  md5: bb3c5484e1c5376846e1b406fd63a3c4
   depends:
   - python
   - __osx >=11.0
@@ -24102,24 +24072,23 @@ packages:
   - __osx >=11.0
   license: MIT
   license_family: MIT
-  size: 31508688
-  timestamp: 1765344479373
-- conda: https://conda.anaconda.org/conda-forge/osx-arm64/polars-runtime-32-1.37.1-py310haaaf75b_0.conda
+  size: 32229626
+  timestamp: 1768303983463
+- conda: https://conda.anaconda.org/conda-forge/osx-arm64/polars-runtime-32-1.38.0-py310haaaf75b_0.conda
   noarch: python
-  sha256: 1c79affdb6f0fcb466d1116ebeb56edb57510549f87351550a6f96f2211d5d2b
-  md5: bb3c5484e1c5376846e1b406fd63a3c4
+  sha256: 74cdbb113a4cb011b1eeb9f732cf994e1360a9c9d5fbc5b3e59a43ee8261c952
+  md5: 8b597d04fb4ff61cb1a1aa2dedf20927
   depends:
   - python
-  - __osx >=11.0
   - libcxx >=19
+  - __osx >=11.0
   - _python_abi3_support 1.*
   - cpython >=3.10
   constrains:
   - __osx >=11.0
   license: MIT
-  license_family: MIT
-  size: 32229626
-  timestamp: 1768303983463
+  size: 32463915
+  timestamp: 1770222213396
 - conda: https://conda.anaconda.org/conda-forge/win-64/polars-runtime-32-1.35.2-py310hca7251b_0.conda
   noarch: python
   sha256: 03fcd84f828086be2cf658fb6250dfa665da241900f61326cae4c5d8c49642b7
@@ -24138,10 +24107,10 @@ packages:
   license_family: MIT
   size: 36375197
   timestamp: 1763738028556
-- conda: https://conda.anaconda.org/conda-forge/win-64/polars-runtime-32-1.36.1-py310hca7251b_0.conda
+- conda: https://conda.anaconda.org/conda-forge/win-64/polars-runtime-32-1.37.1-py310hca7251b_0.conda
   noarch: python
-  sha256: 8def44d2158c55bb3bd604f7744d18aef21242e487aececabb2bd14aa3b57716
-  md5: 1938c5ab40c1343a779973871b2ee04d
+  sha256: 34db578b4bae3ec365ff846c1f01b2720ab01d202e4fc6826114070673e6aeb0
+  md5: 910a4338c2ff9b850374c16fe081b1c3
   depends:
   - python
   - vc >=14.3,<15
@@ -24151,12 +24120,12 @@ packages:
   - cpython >=3.10
   license: MIT
   license_family: MIT
-  size: 38501800
-  timestamp: 1765344443861
-- conda: https://conda.anaconda.org/conda-forge/win-64/polars-runtime-32-1.37.1-py310hca7251b_0.conda
+  size: 39228824
+  timestamp: 1768303964523
+- conda: https://conda.anaconda.org/conda-forge/win-64/polars-runtime-32-1.38.0-py310hca7251b_0.conda
   noarch: python
-  sha256: 34db578b4bae3ec365ff846c1f01b2720ab01d202e4fc6826114070673e6aeb0
-  md5: 910a4338c2ff9b850374c16fe081b1c3
+  sha256: 4ca783286658ef0f6249cb0d069fa246c5635eea5029f8acf88b6cc557b584d8
+  md5: ebf071ad99f66fce0a4f75bebceba448
   depends:
   - python
   - vc >=14.3,<15
@@ -24165,9 +24134,8 @@ packages:
   - _python_abi3_support 1.*
   - cpython >=3.10
   license: MIT
-  license_family: MIT
-  size: 39228824
-  timestamp: 1768303964523
+  size: 39410095
+  timestamp: 1770222241295
 - conda: https://conda.anaconda.org/conda-forge/noarch/pre-commit-4.5.1-pyha770c72_0.conda
   sha256: 5b81b7516d4baf43d0c185896b245fa7384b25dc5615e7baa504b7fa4e07b706
   md5: 7f3ac694319c7eaf81a0325d6405e974
diff --git a/pixi.toml b/pixi.toml
index 71fcf516..855b3bc3 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -117,35 +117,35 @@ polars = "1.35.*"
 
 [feature.polars-latest.dependencies]
 # NOTE: Update docs/faq.md when updating this.
-polars = "1.36.*"
+polars = "1.38.*"
 
 [feature.nightly.tasks]
 install-polars-nightly = "pip install --pre --no-deps --upgrade --only-binary :all: polars polars-runtime-32"
 
 [environments]
 build = ["build"]
-default = ["dev", "lint", "optionals", "py314", "test", "polars-latest"]
+default = ["dev", "lint", "optionals", "polars-latest", "py314", "test"]
 docs = ["docs"]
 lint = { features = ["lint"], no-default-feature = true }
 nightly = ["nightly", "optionals", "test"]
 
 # Different python versions with the latest polars
-py310 = ["py310", "test", "polars-latest"]
-py311 = ["py311", "test", "polars-latest"]
-py312 = ["py312", "test", "polars-latest"]
-py313 = ["py313", "test", "polars-latest"]
-py314 = ["py314", "test", "polars-latest"]
+py310 = ["polars-latest", "py310", "test"]
+py311 = ["polars-latest", "py311", "test"]
+py312 = ["polars-latest", "py312", "test"]
+py313 = ["polars-latest", "py313", "test"]
+py314 = ["polars-latest", "py314", "test"]
 
 # Test with optional dependencies
-py314-optionals = ["optionals", "py314", "test", "polars-latest"]
+py314-optionals = ["optionals", "polars-latest", "py314", "test"]
 
 # Polars compatibility envs
-polars-minimal = ["py314", "test", "polars-minimal"]
 default-polars-minimal = [
   "dev",
   "lint",
   "optionals",
+  "polars-minimal",
   "py314",
   "test",
-  "polars-minimal",
 ]
+polars-minimal = ["polars-minimal", "py314", "test"]
diff --git a/tests/storage/test_fsspec.py b/tests/storage/test_fsspec.py
new file mode 100644
index 00000000..4e0d4a75
--- /dev/null
+++ b/tests/storage/test_fsspec.py
@@ -0,0 +1,26 @@
+# Copyright (c) QuantCo 2025-2026
+# SPDX-License-Identifier: BSD-3-Clause
+
+from typing import Any
+
+import pytest
+
+from dataframely._storage._fsspec import get_file_prefix
+
+
+class MockFS:
+    def __init__(self, protocol: Any) -> None:
+        self.protocol = protocol
+
+
+def test_get_file_prefix() -> None:
+    assert get_file_prefix(MockFS("file")) == ""
+    assert get_file_prefix(MockFS("s3")) == "s3://"
+    assert get_file_prefix(MockFS(["file", "whatever"])) == ""
+    assert get_file_prefix(MockFS(["s3", "whatever"])) == "s3://"
+
+
+@pytest.mark.parametrize("protocol", [5, None, [5]])
+def test_get_file_prefix_invalid(protocol: Any) -> None:
+    with pytest.raises(ValueError):
+        assert 1 == get_file_prefix(MockFS(protocol))