diff --git a/README.md b/README.md
index 3719f3f7c..96ffa4502 100644
--- a/README.md
+++ b/README.md
@@ -119,7 +119,7 @@ docker run --gpus all --pull always --rm -it \
 ### Install with Conda
 
 To install via conda:
-> **Note** cuSpatial is supported only on Linux or [through WSL](https://rapids.ai/wsl2.html), and with Python versions 3.9, 3.10, and 3.11.
+> **Note** cuSpatial is supported only on Linux or [through WSL](https://rapids.ai/wsl2.html), and with Python versions 3.10 and 3.11.
 
 cuSpatial can be installed with conda (miniconda, or the full Anaconda distribution) from the rapidsai channel:
 
@@ -134,7 +134,7 @@ See the [RAPIDS installation documentation](https://docs.rapids.ai/install) for
 ### Install with pip
 
 To install via pip:
-> **Note** cuSpatial is supported only on Linux or [through WSL](https://rapids.ai/wsl2.html), and with Python versions 3.9, 3.10, and 3.11.
+> **Note** cuSpatial is supported only on Linux or [through WSL](https://rapids.ai/wsl2.html), and with Python versions 3.10 and 3.11.
 
 The cuSpatial pip packages can be installed from NVIDIA's PyPI index. pip installations require using the matching wheel to the system's installed CUDA toolkit.
 - For CUDA 11 toolkits, install the `-cu11` wheels
diff --git a/conda/environments/all_cuda-118_arch-x86_64.yaml b/conda/environments/all_cuda-118_arch-x86_64.yaml
index c223ebc29..0cbe9a1f7 100644
--- a/conda/environments/all_cuda-118_arch-x86_64.yaml
+++ b/conda/environments/all_cuda-118_arch-x86_64.yaml
@@ -43,7 +43,7 @@ dependencies:
 - pytest
 - pytest-cov
 - pytest-xdist
-- python>=3.9,<3.12
+- python>=3.10,<3.12
 - rapids-build-backend>=0.3.0,<0.4.0.dev0
 - rmm==24.10.*,>=0.0.0a0
 - scikit-build-core>=0.10.0
diff --git a/conda/environments/all_cuda-125_arch-x86_64.yaml b/conda/environments/all_cuda-125_arch-x86_64.yaml
index 2795c4b2e..1001169e5 100644
--- a/conda/environments/all_cuda-125_arch-x86_64.yaml
+++ b/conda/environments/all_cuda-125_arch-x86_64.yaml
@@ -45,7 +45,7 @@ dependencies:
 - pytest
 - pytest-cov
 - pytest-xdist
-- python>=3.9,<3.12
+- python>=3.10,<3.12
 - rapids-build-backend>=0.3.0,<0.4.0.dev0
 - rmm==24.10.*,>=0.0.0a0
 - scikit-build-core>=0.10.0
diff --git a/dependencies.yaml b/dependencies.yaml
index 25fe6170f..3b4bee329 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -353,10 +353,6 @@ dependencies:
     specific:
       - output_types: conda
         matrices:
-          - matrix:
-              py: "3.9"
-            packages:
-              - python=3.9
           - matrix:
               py: "3.10"
             packages:
@@ -367,7 +363,7 @@ dependencies:
               - python=3.11
           - matrix:
             packages:
-              - python>=3.9,<3.12
+              - python>=3.10,<3.12
   run_python_cuspatial:
     common:
       - output_types: [conda, requirements, pyproject]
diff --git a/pyproject.toml b/pyproject.toml
index 9b073cb98..0de7433bd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,8 @@
+# Copyright (c) 2019-2024, NVIDIA CORPORATION.
+
 [tool.black]
 line-length = 79
-target-version = ["py39"]
+target-version = ["py310"]
 include = '\.py?$'
 force-exclude = '''
 /(
diff --git a/python/cuproj/pyproject.toml b/python/cuproj/pyproject.toml
index 9d63f41e4..7625a01f9 100644
--- a/python/cuproj/pyproject.toml
+++ b/python/cuproj/pyproject.toml
@@ -26,7 +26,7 @@ description = "cuProj: GPU-Accelerated Coordinate Projection"
 readme = { file = "README.md", content-type = "text/markdown" }
 authors = [{ name = "NVIDIA Corporation" }]
 license = { text = "Apache 2.0" }
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "cupy-cuda11x>=12.0.0",
     "rmm==24.10.*,>=0.0.0a0",
@@ -37,7 +37,6 @@ classifiers = [
     "Topic :: Scientific/Engineering",
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
 ]
diff --git a/python/cuspatial/pyproject.toml b/python/cuspatial/pyproject.toml
index 05d278f39..80f436ea6 100644
--- a/python/cuspatial/pyproject.toml
+++ b/python/cuspatial/pyproject.toml
@@ -28,7 +28,7 @@ authors = [
     { name = "NVIDIA Corporation" },
 ]
 license = { text = "Apache 2.0" }
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "cudf==24.10.*,>=0.0.0a0",
     "geopandas>=0.11.0",
@@ -41,7 +41,6 @@ classifiers = [
     "Topic :: Scientific/Engineering",
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
 ]