diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dc9d79a2a..237d1b300 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,9 +62,12 @@ jobs:
         include:
           ### PyQt 5.7.1 (Python 3.5)
           # FIXME: Flaky tests / segfault on exit?
-          # - testenv: py35-pyqt57
-          #   os: ubuntu-16.04
-          #   python: 3.5
+          - testenv: py35-pyqt57
+            os: ubuntu-16.04
+            python: 3.5
+          - testenv: py35-pyqt57
+            os: ubuntu-18.04
+            python: 3.5
           ### PyQt 5.9 (Python 3.6)
           - testenv: py36-pyqt59
             os: ubuntu-20.04
diff --git a/.travis.yml b/.travis.yml
index 4b43eaff2..53a2dbba9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,11 +7,6 @@ os: linux
 matrix:
   fast_finish: true
   include:
-    ### PyQt 5.7.1 (Python 3.5)
-    - python: 3.5
-      env: TESTENV=py35-pyqt57
-      dist: xenial
-
     ### macOS Mojave (10.14)
     - os: osx
       env: TESTENV=py37-pyqt514 OSX=mojave