diff --git a/pyproject.toml b/pyproject.toml
index 2db00275b91b..fea606abd90a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,26 +40,41 @@ requires = [
     "setuptools",
     "poetry-core>=1.9.1",
     "numpy>=1.26.4",
-    "Cython==3.0.11",
+    "Cython"  # 
+    # "https://github.com/cython/cython"
 ]
+# "Cython==3.1.1",  # "Cython==3.0.11",
+
 build-backend = "poetry.core.masonry.api"
 
 [tool.poetry.build]
 script = "build.py"
 generate-setup-file = false
 
+[[tool.poetry.source]]
+name = "arrow-nightlies"
+url = "https://pypi.fury.io/arrow-nightlies/"
+priority = "supplemental"
+
 [tool.poetry.dependencies]
-python = ">=3.11,<3.13"
-cython = "==3.0.11"  # Build dependency (pinned for stability)
+python = ">=3.11,<4.0"
+
+# cython = "==3.0.11"  # Build dependency (pinned for stability)
+Cython = { git = "https://github.com/cython/cython.git" }  # , tag = "3.1.0a0"
 numpy = ">=1.26.4"  # Build dependency
 setuptools = ">=75" # Build dependency
 click = "^8.1.7"
 fsspec = "^2024.10.0"
 msgspec = "^0.18.6"
+fsspec = "==2023.6.0"  # Pinned due breaking changes
+# msgspec = "^0.18.6"
+msgspec = { git = "https://github.com/jcrist/msgspec" }
 pandas = "^2.2.3"
-pyarrow = ">=18.0.0"
+# pyarrow = ">=17.0.0"
+pyarrow = { version = "18.0.0.dev499", source = "arrow-nightlies", allow-prereleases = true }
 pytz = ">=2024.2.0"
 tqdm = "^4.67.0"
+# uvloop = {version = "^0.21.0", markers = "sys_platform != 'win32'"}
 uvloop = {version = "^0.21.0", markers = "sys_platform != 'win32'"}
 
 async-timeout = {version = "^4.0.3", optional = true}
@@ -119,7 +134,7 @@ numpydoc = "^1.8.0"
 linkify-it-py = "^2.0.3"
 myst-parser = "^3.0.1"
 sphinx_comments = "^0.0.3"
-sphinx_markdown_builder = "^0.6.6"
+# sphinx_markdown_builder = "^0.6.6"
 
 [tool.isort]  # Used by legacy isort for Cython modules
 py_version = "311"