diff --git a/.github/workflows/tox_pytest.yml b/.github/workflows/tox_pytest.yml
index 381eb345c..dade3ebc6 100644
--- a/.github/workflows/tox_pytest.yml
+++ b/.github/workflows/tox_pytest.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.7, 3.8]
 
     steps:
     - uses: actions/checkout@v1
diff --git a/ci/templates/.appveyor.yml b/ci/templates/.appveyor.yml
index 0423027f0..c90413989 100644
--- a/ci/templates/.appveyor.yml
+++ b/ci/templates/.appveyor.yml
@@ -6,9 +6,9 @@ environment:
     COVERALLS_REPO_TOKEN: COVERALLS_TOKEN
   matrix:
     - TOXENV: check
-      TOXPYTHON: C:\Python36\python.exe
-      PYTHON_HOME: C:\Python36
-      PYTHON_VERSION: '3.6'
+      TOXPYTHON: C:\Python38\python.exe
+      PYTHON_HOME: C:\Python38
+      PYTHON_VERSION: '3.8'
       PYTHON_ARCH: '32'
 {% for env, config in tox_environments|dictsort %}
 {% if env.startswith(('py2', 'py3')) %}
diff --git a/ci/templates/.travis.yml b/ci/templates/.travis.yml
index 56da4d5f2..c450665e1 100644
--- a/ci/templates/.travis.yml
+++ b/ci/templates/.travis.yml
@@ -7,10 +7,10 @@ env:
     - SEGFAULT_SIGNALS=all
 matrix:
   include:
-    - python: '3.6'
+    - python: '3.8'
       env:
         - TOXENV=check
-    - python: '3.6'
+    - python: '3.8'
       env:
         - TOXENV=docs
 {%- for env, config in tox_environments|dictsort %}{{ '' }}
diff --git a/ci/templates/tox.ini b/ci/templates/tox.ini
index b87a4072d..c5f326fff 100644
--- a/ci/templates/tox.ini
+++ b/ci/templates/tox.ini
@@ -10,7 +10,7 @@ envlist =
 
 [testenv]
 basepython =
-    docs: {env:TOXPYTHON:python3.6}
+    docs: {env:TOXPYTHON:python3.8}
     {bootstrap,clean,check,report,codecov,coveralls}: {env:TOXPYTHON:python3}
 setenv =
     PYTHONPATH={toxinidir}/tests
diff --git a/docs/whats_new/v0-4-3-003.rst b/docs/whats_new/v0-4-3-003.rst
index ff50ed14b..57d2e4bdb 100644
--- a/docs/whats_new/v0-4-3-003.rst
+++ b/docs/whats_new/v0-4-3-003.rst
@@ -8,6 +8,7 @@ Documentation
 
 Other Changes
 #############
+- Remove Python3.6 support.
 - Make it possible to include results in automatic model report, for more
   information see the corresponding section in the documentation:
   :ref:`TESPy Networks Postprocessing <tespy_modules_network_label>`
diff --git a/setup.py b/setup.py
index f92514235..c0de83b20 100644
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,6 @@ def read(*names, **kwargs):
         'Operating System :: POSIX',
         'Operating System :: Microsoft :: Windows',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Topic :: Scientific/Engineering',
@@ -62,7 +61,7 @@ def read(*names, **kwargs):
         'Changelog': 'https://tespy.readthedocs.io/en/latest/whats_new.html',
         'Issue Tracker': 'https://github.com/oemof/tespy/issues',
     },
-    python_requires='>=3.6, <3.9',
+    python_requires='>=3.7, <3.9',
     install_requires=[
         'CoolProp>=6.4,<7',
         'matplotlib>=3.2.1,<4',
diff --git a/tox.ini b/tox.ini
index 2b376463f..31df49f36 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,20 +3,18 @@ envlist =
     clean,
     check,
     docs,
-    py36,
     py37,
     py38,
     report
 
 [gh-actions]
 python =
-    3.6: py36
     3.7: py37
     3.8: py38
 
 [testenv]
 basepython =
-    docs: {env:TOXPYTHON:python3.6}
+    docs: {env:TOXPYTHON:python3.8}
     {bootstrap,clean,check,report,codecov,coveralls}: {env:TOXPYTHON:python3}
 setenv =
     PYTHONPATH={toxinidir}/tests
@@ -87,17 +85,6 @@ commands = coverage erase
 skip_install = true
 deps = coverage
 
-[testenv:py36]
-basepython = {env:TOXPYTHON:python3.6}
-setenv =
-    {[testenv]setenv}
-usedevelop = true
-commands =
-    {posargs:pytest --cov --cov-report=term-missing -vv}
-deps =
-    {[testenv]deps}
-    pytest-cov
-
 [testenv:py37]
 basepython = {env:TOXPYTHON:python3.7}
 setenv =