try changing 3.9 to 3.12 in the file and save it.

.github/workflows/format.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: "3.10"
 
       - name: Install dependencies
         run: pip install black

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.10', '3.11', '3.12']
 
 
     steps:
@@ -29,13 +29,15 @@ jobs:
 
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
+          python -m pip install --upgrade pip 
+
           pip install -r requirements.txt
           pip install --upgrade git+https://github.com/PennyLaneAI/pennylane.git#egg=pennylane
           pip install wheel pytest pytest-cov pytest-mock --upgrade
 
       - name: Install Plugin
         run: |
+          pip install --upgrade pip setuptools
           python setup.py bdist_wheel
           pip install dist/pennylane*.whl
 
@@ -61,11 +63,11 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: "3.12"
 
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
+          python -m pip install --upgrade pip setuptools
           pip install -r requirements.txt
           pip install pytest-benchmark
           pip install --upgrade git+https://github.com/PennyLaneAI/pennylane.git#egg=pennylane
@@ -84,4 +86,4 @@ jobs:
       - name: Upload coverage to Codecov
         uses: codecov/[email protected]
         with:
-          file: ./coverage.xml
+          file: ./coverage.xml

.github/workflows/upload.yml

@@ -12,11 +12,11 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: "3.10"
 
       - name: Build and install Plugin
         run: |
-          python -m pip install --upgrade pip wheel
+          python -m pip install --upgrade pip wheel setuptools
           python setup.py bdist_wheel
           pattern="dist/pennylane*.whl"
           wheel=( $pattern )

.readthedocs.yml

@@ -27,6 +27,6 @@ python:
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.9"
+    python: "3.10"
   apt_packages:
     - graphviz

CHANGELOG.md

@@ -5,11 +5,17 @@
 * Fix deprecated import path for `QubitDevice`.
   [(#74)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/74)
 
+### Breaking changes 💔
+
+* Removes support for Python 3.9.
+  [(#43)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/78)
+
 ### Contributors ✍️
 
 This release contains contributions from (in alphabetical order):
 
 Astral Cai
+Yushao Chen
 
 ---
 # Release 0.36.0

README.rst

@@ -79,7 +79,7 @@ and compared the runtimes between CPU and GPU.
 Installation
 ============
 
-This plugin requires Python version 3.6 or above, as well as PennyLane and
+This plugin requires Python version 3.10 or above, as well as PennyLane and
 Qulacs. Installation of this plugin, as well as all dependencies, can be done
 using ``pip``:
 
@@ -128,7 +128,7 @@ Dependencies
 
 PennyLane-Qulacs requires the following libraries be installed:
 
-* `Python <http://python.org/>`__ >= 3.6
+* `Python <http://python.org/>`__ >= 3.10
 
 as well as the following Python packages:
 

setup.py

@@ -13,8 +13,8 @@
 # limitations under the License.
 #!/usr/bin/env python3
 import re
-from setuptools import setup
 
+from setuptools import setup
 
 with open("./pennylane_qulacs/_version.py") as f:
     (version,) = re.findall('__version__ = "(.*)"', f.read())
@@ -40,7 +40,9 @@
     "license": "Apache License 2.0",
     "packages": ["pennylane_qulacs"],
     "entry_points": {
-        "pennylane.plugins": ["qulacs.simulator = pennylane_qulacs.qulacs_device:QulacsDevice"]
+        "pennylane.plugins": [
+            "qulacs.simulator = pennylane_qulacs.qulacs_device:QulacsDevice"
+        ]
     },
     "description": "PennyLane plugin for Qulacs.",
     "long_description": open("README.rst").read(),
@@ -63,9 +65,9 @@
     "Programming Language :: Python",
     # Make sure to specify here the versions of Python supported
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3 :: Only",
     "Topic :: Scientific/Engineering :: Physics",
 ]