diff --git a/.github/workflows/tf_sample.yaml b/.github/workflows/tf_sample.yaml
index 2cf758ea..39083352 100644
--- a/.github/workflows/tf_sample.yaml
+++ b/.github/workflows/tf_sample.yaml
@@ -27,6 +27,8 @@ jobs:
       matrix:
         context: [dev, stg]
 
+    environment: ${{ format('{0}', github.event.pull_request.merged && matrix.context || '') }}
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
@@ -58,6 +60,8 @@ jobs:
       matrix:
         context: [dev, stg]
 
+    environment: ${{ format('{0}', github.event.pull_request.merged && matrix.context || '') }}
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7