diff --git a/.copier-answers.yml b/.copier-answers.yml
index 334f112..22615cb 100644
--- a/.copier-answers.yml
+++ b/.copier-answers.yml
@@ -1,5 +1,5 @@
 # Changes here will be overwritten by Copier
-_commit: v2.0.3
+_commit: v2.0.4
 _src_path: gh:lincc-frameworks/python-project-template
 author_email: lincc-frameworks-team@lists.lsst.org
 author_name: LINCC Frameworks
@@ -19,7 +19,6 @@ project_license: BSD
 project_name: hats_cloudtests
 project_organization: astronomy-commons
 python_versions:
-- '3.9'
 - '3.10'
 - '3.11'
 - '3.12'
diff --git a/.github/workflows/asv-main.yml b/.github/workflows/asv-main.yml
index 32c25cf..477ba59 100644
--- a/.github/workflows/asv-main.yml
+++ b/.github/workflows/asv-main.yml
@@ -8,7 +8,7 @@ on:
     branches: [ main ]
 
 env:
-  PYTHON_VERSION: "3.10"
+  PYTHON_VERSION: "3.11"
   ASV_VERSION: "0.6.4"
   WORKING_DIR: ${{github.workspace}}/benchmarks
 
diff --git a/.github/workflows/asv-nightly.yml b/.github/workflows/asv-nightly.yml
index 28b270a..ad6d162 100644
--- a/.github/workflows/asv-nightly.yml
+++ b/.github/workflows/asv-nightly.yml
@@ -9,7 +9,7 @@ on:
   workflow_dispatch:
   
 env:
-  PYTHON_VERSION: "3.10"
+  PYTHON_VERSION: "3.11"
   ASV_VERSION: "0.6.4"
   WORKING_DIR: ${{github.workspace}}/benchmarks
   NIGHTLY_HASH_FILE: nightly-hash
diff --git a/.github/workflows/asv-pr.yml b/.github/workflows/asv-pr.yml
index 4499eb9..e78bf42 100644
--- a/.github/workflows/asv-pr.yml
+++ b/.github/workflows/asv-pr.yml
@@ -15,7 +15,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  PYTHON_VERSION: "3.10"
+  PYTHON_VERSION: "3.11"
   ASV_VERSION: "0.6.4"
   WORKING_DIR: ${{github.workspace}}/benchmarks
   ARTIFACTS_DIR: ${{github.workspace}}/artifacts
diff --git a/.github/workflows/pre-commit-ci.yml b/.github/workflows/pre-commit-ci.yml
index 54cebb1..22d0f01 100644
--- a/.github/workflows/pre-commit-ci.yml
+++ b/.github/workflows/pre-commit-ci.yml
@@ -19,7 +19,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.10'
+        python-version: '3.11'
     - name: Install dependencies
       run: |
         sudo apt-get update
diff --git a/.github/workflows/smoke-test.yml b/.github/workflows/smoke-test.yml
index 482f4b5..5c3d6f4 100644
--- a/.github/workflows/smoke-test.yml
+++ b/.github/workflows/smoke-test.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.10', '3.11', '3.12']
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/testing-and-coverage.yml b/.github/workflows/testing-and-coverage.yml
index 9bc987e..5505131 100644
--- a/.github/workflows/testing-and-coverage.yml
+++ b/.github/workflows/testing-and-coverage.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.10', '3.11', '3.12']
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b17c341..df7163c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -18,7 +18,7 @@ repos:
         description: Clear output from Jupyter notebooks.
         files: \.ipynb$
         exclude: ^docs/pre_executed
-        stages: [commit]
+        stages: [pre-commit]
         language: system
         entry: jupyter nbconvert --clear-output
     # Prevents committing directly branches named 'main' and 'master'.
@@ -94,7 +94,7 @@ repos:
         # supported by your project here, or alternatively use
         # pre-commit's default_language_version, see
         # https://pre-commit.com/#top_level-default_language_version
-        language_version: python3.10
+        language_version: python3.11
     # Run unit tests, verify that they pass. Note that coverage is run against
     # the ./src directory here because that is what will be committed. In the
     # github workflow script, the coverage is run against the installed package
diff --git a/benchmarks/asv.conf.json b/benchmarks/asv.conf.json
index 700b358..96bac51 100644
--- a/benchmarks/asv.conf.json
+++ b/benchmarks/asv.conf.json
@@ -36,7 +36,7 @@
     // The Pythons you'd like to test against. If not provided, defaults
     // to the current version of Python used to run `asv`.
     "pythons": [
-        "3.10"
+        "3.11"
     ],
     // The matrix of dependencies to test. Each key is the name of a
     // package (in PyPI) and the values are version numbers.  An empty
diff --git a/pyproject.toml b/pyproject.toml
index 4f49fe8..28da5c4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ classifiers = [
     "Programming Language :: Python",
 ]
 dynamic = ["version"]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     # lsdb, hats, and hats-import are built from source via requirements.txt
     "adlfs",
@@ -53,7 +53,7 @@ markers = [
 ]
 [tool.black]
 line-length = 110
-target-version = ["py39"]
+target-version = ["py310"]
 
 [tool.isort]
 profile = "black"
@@ -61,7 +61,7 @@ line_length = 110
 
 [tool.ruff]
 line-length = 110
-target-version = "py39"
+target-version = "py310"
 
 [tool.ruff.lint]
 select = [
diff --git a/src/.pylintrc b/src/.pylintrc
index 7bd3e03..41043cf 100644
--- a/src/.pylintrc
+++ b/src/.pylintrc
@@ -87,7 +87,7 @@ persistent=yes
 
 # Minimum Python version to use for version dependent checks. Will default to
 # the version used to run pylint.
-py-version=3.9
+py-version=3.10
 
 # Discover python modules and packages in the file system subtree.
 recursive=no
diff --git a/tests/.pylintrc b/tests/.pylintrc
index b5afc24..8c79f98 100644
--- a/tests/.pylintrc
+++ b/tests/.pylintrc
@@ -87,7 +87,7 @@ persistent=yes
 
 # Minimum Python version to use for version dependent checks. Will default to
 # the version used to run pylint.
-py-version=3.9
+py-version=3.10
 
 # Discover python modules and packages in the file system subtree.
 recursive=no