diff --git a/.ci/appveyor.yml b/.ci/appveyor.yml
index b2f1683d..6e85843d 100644
--- a/.ci/appveyor.yml
+++ b/.ci/appveyor.yml
@@ -17,6 +17,13 @@ environment:
         - PYTHON: "C:\\Python36\\python.exe"
         - PYTHON: "C:\\Python36-x64\\python.exe"
 
+branches:
+    # Avoid building PR branches.
+    only:
+        - master
+        - ci
+        - releases
+
 install:
     - "%PYTHON% -m pip install --upgrade pip wheel setuptools"
     - "%PYTHON% -m pip install -r .ci/requirements-win.txt"
diff --git a/.travis.yml b/.travis.yml
index 767315af..f6e648b1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,6 +18,13 @@ env:
 
         - DOCS_PUSH_KEY_LABEL=0760b951e99c
 
+branches:
+    # Avoid building PR branches.
+    only:
+        - master
+        - ci
+        - releases
+
 matrix:
     fast_finish: true
 
@@ -96,7 +103,17 @@ matrix:
           dist: trusty
           sudo: false
           language: python
-          python: "3.6-dev"
+          python: "3.6"
+          services: postgresql
+          env: BUILD=tests PGVERSION=9.6
+          addons:
+              postgresql: '9.6'
+
+        - os: linux
+          dist: trusty
+          sudo: false
+          language: python
+          python: "3.7-dev"
           services: postgresql
           env: BUILD=tests PGVERSION=9.6
           addons: