diff --git a/.travis.yml b/.travis.yml
index 3e700c485..8d8c76262 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,10 +12,9 @@ cache:
     - $HOME/.cache/pip
     - $HOME/.local
 
+# Test against earliest supported (Python 3) release and latest stable release
 python:
   - "3.9"
-  - "3.8"
-  - "3.7"
   - "3.6"
 
 env:
@@ -25,9 +24,6 @@ env:
 # Add optional builds that test against latest version of slycot, python
 jobs:
   include:
-    - name: "Python 3.8, slycot=source"
-      python: "3.8"
-      env: SCIPY=scipy SLYCOT=source
     - name: "Python 3.9, slycot=source, array and matrix"
       python: "3.9"
       env: SCIPY=scipy SLYCOT=source PYTHON_CONTROL_ARRAY_AND_MATRIX=1