diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9275b604..20784eb1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -42,18 +42,6 @@ jobs:
       - image: circleci/python:3.7
         environment:
           TOXENV: lint
-  py34-core:
-    <<: *common
-    docker:
-      - image: circleci/python:3.4
-        environment:
-          TOXENV: py34-core
-  py35-core:
-    <<: *common
-    docker:
-      - image: circleci/python:3.5
-        environment:
-          TOXENV: py35-core
   py36-core:
     <<: *common
     docker:
@@ -71,7 +59,5 @@ workflows:
   test:
     jobs:
       - lint
-      - py34-core
-      - py35-core
       - py36-core
       - py37-core
diff --git a/setup.py b/setup.py
index 836d81b0..80bd159c 100644
--- a/setup.py
+++ b/setup.py
@@ -38,15 +38,13 @@
     package_data={'py_ecc': ['py.typed']},
     install_requires=[
     ],
-    python_requires='>=3.4, <4',
+    python_requires='>=3.6, <4',
     extras_require=extras_require,
     classifiers=[
         'Development Status :: 3 - Alpha',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Natural Language :: English',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: PyPy',
diff --git a/tox.ini b/tox.ini
index ed3662a2..964cb7a9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist=
-    py{34,35,36,37}-core
+    py{36,37}-core
     lint
 
 [flake8]
@@ -16,8 +16,6 @@ passenv=
 deps =
 extras = test
 basepython =
-    py34: python3.4
-    py35: python3.5
     py36: python3.6
     py37: python3.7