diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index a712871..16c79cc 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -19,7 +19,7 @@ jobs:
         mamba-version: "*"
         channels: conda-forge,nodefaults
         channel-priority: true
-        environment-file: .github/ci_support/environment.yml
+        environment-file: .ci_support/environment.yml
     - name: Install Jupyterbook
       shell: bash -l {0}
       run: |