diff --git a/.github/main.workflow.yml b/.github/main.workflow.yml
index 0bbee016..26a8ecaa 100644
--- a/.github/main.workflow.yml
+++ b/.github/main.workflow.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ${{ matrix.operating-system }}
     strategy:
       matrix:
-        operating-system: [linux, macOS, windows]
+        operating-system: [Linux, macOS, Windows]
     actions:
     - name: npm install
       run: npm install