diff --git a/.github/workflows/continuous_integration.yml b/.github/workflows/continuous_integration.yml
index 201f0a2..64c9ad8 100644
--- a/.github/workflows/continuous_integration.yml
+++ b/.github/workflows/continuous_integration.yml
@@ -14,15 +14,35 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, windows-2019, macOS-10.15]
-        python-version: [ 3.6, 3.7, 3.8, 3.9 ]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+        python-version: [ 3.11, 3.12, 3.13 ]
+        include:
+          - os: ubuntu-20.04
+            python-version: '3.10'
+          - os: ubuntu-20.04
+            python-version: '3.9'
+          - os: ubuntu-20.04
+            python-version: '3.8'
+
+          - os: macos-latest
+            python-version: '3.10'
+          - os: macos-latest
+            python-version: '3.9'
+          - os: macos-latest
+            python-version: '3.8'
+
+          - os: windows-latest
+            python-version: '3.10'
+          - os: windows-latest
+            python-version: '3.9'
+          - os: windows-latest
+            python-version: '3.8'
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Setup python version ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-          architecture: x64
       - name: Install pytest
         run: |
           python -m pip install --upgrade pip
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index ef9ddc6..2046e3d 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -5,12 +5,16 @@
 # Required
 version: 2
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
    configuration: docs/conf.py
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-   version: 3.8
    install:
-   - requirements: docs/requirements.txt
\ No newline at end of file
+   - requirements: docs/requirements.txt
diff --git a/docs/conf.py b/docs/conf.py
index 4324663..77ed362 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -52,8 +52,8 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-# html_theme = 'alabaster'
 html_theme = 'sphinx_rtd_theme'
+
 # html_theme_options = {
 #     'analytics_id': 'G-CH3JS5076R',  # Provided by Google in your dashboard
 #     'analytics_anonymize_ip': False,
@@ -74,3 +74,8 @@
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
+# python3 -m sphinx.ext.intersphinx https://docs.python-requests.org/en/master/objects.inv
+intersphinx_mapping = {
+    'requests': ('https://docs.python-requests.org/en/master/', None),
+    'python': ('https://docs.python.org/3', None)
+}
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4f61efd..fd49df5 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,7 +1,8 @@
-sphinx==3.5.4
+sphinx==5.1.1
 sphinxcontrib-bibtex
 sphinx-copybutton
 pandas
 pynmrstar>=3.0.4
 plotly>=4.5.4
-numpy>=1.15.0
\ No newline at end of file
+numpy>=1.15.0
+sphinx_rtd_theme
diff --git a/setup.py b/setup.py
index 78d73e0..ddb1bfc 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@ def get_version():
       version=get_version(),
       packages=['pybmrb'],
       install_requires=['pandas', 'requests>=2.21.0,<=3', 'plotly>=4.1.0', 'pynmrstar>=3.0.4', 'numpy>1.15'],
-      python_requires='>=3.6',
+      python_requires='>=3.7',
       author='Kumaran Baskaran',
       author_email='baskaran@uchc.edu',
       description='PyBMRB provides tools for visualizing BMRB entries and  NMR-STAR files. '
@@ -41,10 +41,12 @@ def get_version():
           'Development Status :: 5 - Production/Stable',
           'Environment :: Console',
           'Programming Language :: Python :: 3 :: Only',
-          'Programming Language :: Python :: 3.6',
-          'Programming Language :: Python :: 3.7',
           'Programming Language :: Python :: 3.8',
           'Programming Language :: Python :: 3.9',
+          'Programming Language :: Python :: 3.10',
+          'Programming Language :: Python :: 3.11',
+          'Programming Language :: Python :: 3.12',
+          'Programming Language :: Python :: 3.13',
           'Intended Audience :: Education',
           'License :: OSI Approved :: MIT License',
           'Natural Language :: English',