diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index b94d5e0..fe800bf 100644
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -7,6 +7,7 @@ on:
   push:
     branches: [ "main" ]
   pull_request:
+    types: [opened, reopened, synchronize, ready_for_review]
     branches: [ "main" ]
 
 permissions:
@@ -21,6 +22,13 @@ jobs:
       matrix:
         python-version: ["3.8", "3.9"]
         os: [ubuntu-22.04]
+        # Is it a draft Pull Request (true or false)?
+        isDraft:
+          - ${{ github.event.pull_request.draft }}
+        # Only run one job (Ubuntu + Python 3.8) for draft PRs
+        exclude:
+          - python-version: '3.9'
+            isDraft: true
         # Only install optional packages on Python 3.9
         include:
           - python-version: '3.8'