diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5d471da..cf6fc5c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,7 +30,7 @@ jobs:
 
     strategy:
       matrix:
-        release: R2021b
+        release: [R2021b]
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps: