diff --git a/DEVELOPER.md b/DEVELOPER.md
index dbb07fd77..20aa2490c 100644
--- a/DEVELOPER.md
+++ b/DEVELOPER.md
@@ -53,7 +53,7 @@ GitHub's  [Guide to Installing Git](https://help.github.com/articles/set-up-git)
 
 FloPy supports several recent versions of Python, loosely following [NEP 29](https://numpy.org/neps/nep-0029-deprecation_policy.html#implementation).
 
-Install Python 3.9-3.12 via [standalone download](https://www.python.org/downloads/) or a distribution like [Anaconda](https://www.anaconda.com/products/individual) or [miniconda](https://docs.conda.io/en/latest/miniconda.html).
+Install Python >=3.9 via [standalone download](https://www.python.org/downloads/) or a distribution like [Anaconda](https://www.anaconda.com/products/individual) or [miniconda](https://docs.conda.io/en/latest/miniconda.html).
 
 Then install FloPy and core dependencies from the project root:
 
diff --git a/README.md b/README.md
index 327b9b012..e22f58134 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ Documentation
 Installation
 -----------------------------------------------
 
-FloPy requires **Python** 3.9-3.12 with: 
+FloPy requires **Python** 3.9+ with:
 
 ```
 numpy >=1.20.3
diff --git a/etc/environment.yml b/etc/environment.yml
index 6e03d5676..12163818a 100644
--- a/etc/environment.yml
+++ b/etc/environment.yml
@@ -5,7 +5,7 @@ dependencies:
   - pip
 
   # required
-  - python>=3.9,<3.13
+  - python>=3.9
   - numpy>=1.20.3
   - matplotlib>=1.4.0
   - pandas>=2.0.0
diff --git a/pyproject.toml b/pyproject.toml
index 99e195167..4d1ae3f9c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,9 +24,10 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Scientific/Engineering :: Hydrology",
 ]
-requires-python = ">=3.9,<3.13"
+requires-python = ">=3.9"
 dependencies = [
     "numpy>=1.20.3",
     "matplotlib >=1.4.0",
@@ -69,12 +70,12 @@ optional = [
     "pymetis ; platform_system != 'Windows'",
     "pyproj",
     "pyshp",
-    "pyvista",
+    "pyvista ; python_version <'3.13'",
     "rasterio",
     "rasterstats",
     "scipy",
     "shapely >=1.8",
-    "vtk",
+    "vtk ; python_version <'3.13'",
     "xmipy",
 ]
 doc = [