diff --git a/conda/dev-environment-unix.yml b/conda/dev-environment-unix.yml
index 7da921392..60b77eba4 100644
--- a/conda/dev-environment-unix.yml
+++ b/conda/dev-environment-unix.yml
@@ -30,7 +30,7 @@ dependencies:
  - pillow
  - polars
  - psutil
- - pyarrow>=7,<19
+ - pyarrow>=15,<19
  - pydantic>=2
  - pytest
  - pytest-asyncio
diff --git a/pyproject.toml b/pyproject.toml
index f8129fe2d..df6dce3ce 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ requires = [
     "cmake",
     "deprecated",  # Because used in csp.impl.struct, which is used in autogen
     "oldest-supported-numpy",
-    "pyarrow>=7,<19",
+    "pyarrow>=15,<19",
     "ruamel.yaml",
     "scikit-build",
     "setuptools>=69,<74",
@@ -25,7 +25,8 @@ dependencies = [
     "packaging",
     "pandas",
     "psutil",
-    "pyarrow>=7,<19",
+    "pyarrow>=15,<19",
+    "pydantic>=2",
     "pytz",
     "ruamel.yaml",
     "sqlalchemy",
@@ -85,8 +86,6 @@ develop = [
     "threadpoolctl",  # test_random
     "tornado",  # profiler, perspective, websocket
     "python-rapidjson", # websocket
-    # type checking
-    "pydantic>=2",
 ]
 showgraph = [
     "graphviz",
@@ -103,7 +102,6 @@ test = [
     "perspective-python",
     "polars",
     "psutil",
-    "pydantic>=2",
     "requests",
     "slack-sdk>=3",
     "sqlalchemy",