diff --git a/.github/workflows/metrics-multi-repo.yml b/.github/workflows/metrics-multi-repo.yml
index ef41fc9d..dfb15334 100644
--- a/.github/workflows/metrics-multi-repo.yml
+++ b/.github/workflows/metrics-multi-repo.yml
@@ -15,15 +15,8 @@ jobs:
       - name: Get dates for last month
         shell: bash
         run: |
-          # Calculate the first day of the previous month
-          first_day=$(date -d "last month" +%Y-%m-01)
-
-          # Calculate the last day of the previous month
-          last_day=$(date -d "$first_day +1 month -1 day" +%Y-%m-%d)
-
-          #Set an environment variable with the date range
-          echo "$first_day..$last_day"
-          echo "last_month=$first_day..$last_day" >> "$GITHUB_ENV"
+          # 検証のためハードコードする
+          echo "last_month=2022-07-01..2023-07-31" >> "$GITHUB_ENV"
 
       - name: Get issue metrics repo
         uses: github/issue-metrics@v2