diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index ae95e55f..fd60bc42 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -26,7 +26,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ "ubuntu-latest" ]
-        python-version: [ "3.9", "3.10" ]
+        python-version: [ "3.10", "3.11" ]
         test: [ 'coveralls' ]
 
     steps:
diff --git a/.readthedocs.yml b/.readthedocs.yml
index 8e3ea079..7f3255de 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -9,9 +9,9 @@ sphinx:
 build:
   os: ubuntu-22.04
   apt_packages:
-     - graphviz
+    - graphviz
   tools:
-    python: "3.10"
+    python: "3.11"
 
 python:
   install:
diff --git a/pyproject.toml b/pyproject.toml
index f94522ff..a2e87f36 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,8 +13,8 @@ classifiers = [
     "Development Status :: 3 - Alpha",
     "Natural Language :: English",
     "Operating System :: OS Independent",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
     "Intended Audience :: Science/Research",
     "Programming Language :: Python :: Implementation :: CPython",
     "Topic :: Scientific/Engineering :: Physics",
@@ -25,7 +25,7 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.9,<4.0"
+python = ">=3.10,<4.0"
 numpy = "*"
 pandas = "*"
 scipy = "*"