diff --git a/.github/workflows/build-test-envt.yml b/.github/workflows/build-test-envt.yml
index 4b22cc8..d7bb073 100644
--- a/.github/workflows/build-test-envt.yml
+++ b/.github/workflows/build-test-envt.yml
@@ -4,6 +4,7 @@
 name: Test Geo-python Envt Mac, Linux, Windows
 
 on:
+  workflow_dispatch:
   pull_request:
   push:
     branches: