diff --git a/.github/workflows/pull-request-validation.yml b/.github/workflows/pull-request-validation.yml
index 5c465b6ae1..1f50beb12b 100644
--- a/.github/workflows/pull-request-validation.yml
+++ b/.github/workflows/pull-request-validation.yml
@@ -154,8 +154,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        shard-index: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
-        shard-count: [19]
+        shard-index: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18]
+        shard-count: [18]
 
     steps:
       - name: Use Node.js ${{ env.node-version }}