diff --git a/.github/workflows/conda-lock.yaml b/.github/workflows/conda-lock.yaml
index 35cd50f..8e7d38e 100644
--- a/.github/workflows/conda-lock.yaml
+++ b/.github/workflows/conda-lock.yaml
@@ -1,6 +1,8 @@
 name: update conda lockfile
 on:
   push:
+    branches:
+      - main
     paths:
       - .github/workflows/conda-lock.yaml
       - environment.yml