diff --git a/conda.recipe/meta.yaml b/conda.recipe/meta.yaml
index 60028ed73..d618a778f 100755
--- a/conda.recipe/meta.yaml
+++ b/conda.recipe/meta.yaml
@@ -8,7 +8,7 @@ build:
 
 requirements:
   build:
-    - "python>=3.9, <3.13"
+    - "python>=3.10, <3.13"
     - "numpy>=1.26,<1.27"
     - "pandas>=2.2"
     - "bokeh>=2.4"
@@ -19,7 +19,7 @@ requirements:
     - behresp
 
   run:
-    - "python>=3.9, <3.13"
+    - "python>=3.10, <3.13"
     - "numpy>=1.26,<1.27"
     - "pandas>=2.2"
     - "bokeh>=2.4"
diff --git a/environment.yml b/environment.yml
index e848d0284..8032c1e8d 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,7 +2,7 @@ name: taxcalc-dev
 channels:
   - conda-forge
 dependencies:
-- "python>=3.9, <3.13"
+- "python>=3.10, <3.13"
 - "numpy>=1.26,<1.27"
 - "pandas>=2.2"
 - "bokeh>=2.4"
diff --git a/setup.py b/setup.py
index 3147899bd..edc1094e1 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,6 @@
         "Operating System :: OS Independent",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",