diff --git a/.travis.yml b/.travis.yml
index 9002d64..8ac7bfe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ jobs:
       dist: xenial
       python: '3.9-dev'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist
@@ -14,7 +14,7 @@ jobs:
       dist: xenial
       python: '3.8'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist
@@ -22,7 +22,7 @@ jobs:
       dist: xenial
       python: '3.7'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist
@@ -30,7 +30,7 @@ jobs:
       dist: xenial
       python: '3.6'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist
@@ -38,15 +38,15 @@ jobs:
       dist: xenial
       python: '3.5'
       install:
-        - pip install -r requirements.txt
-        - flake8 --count
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
+        - flake8 --count
         - python setup.py bdist_wheel sdist
     - name: "Python 3.4"
       dist: trusty
       python: '3.4'
       install:
-        - pip install -I -r requirements.txt
+        - pip install -I "flake8<=2.6" -r requirements.txt
       script:
         - flake8 --count --ignore=F401 .
         - python setup.py bdist_wheel sdist
@@ -54,7 +54,7 @@ jobs:
       dist: trusty
       python: '3.3'
       install:
-        - pip install -I -r requirements.txt
+        - pip install -I "flake8<=2.6" -r requirements.txt
       script:
         - flake8 --count --ignore=F401 .
         - python setup.py bdist_wheel sdist
@@ -62,7 +62,7 @@ jobs:
       dist: xenial
       python: '2.7'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist
diff --git a/requirements.txt b/requirements.txt
index 88e76d6..2f1b452 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,7 @@
-flake8>=3.8;python_version>="3.5"
 setuptools;python_version>="3.5"
-flake8>=2.6,<3.0;python_version=='3.4'
-flake8>=2.6,<3.0;python_version=='3.3'
 setuptools<=39.2 ;python_version=='3.4'
 setuptools<=39.2 ;python_version=='3.3'
 typing>=3.6,<3.7;python_version=='3.4'
 typing>=3.6,<3.7;python_version=='3.3'
-flake8>=3.8;python_version<'3'
 setuptools<=44.1;python_version<"3"
 typing>=3.7;python_version<"3"