diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 94cc1a5b..09a184a7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -99,11 +99,11 @@ jobs:
         # the asterisk matching behaviour, not the literal string.
         run: |
           if [ "${GITHUB_EVENT_NAME}" == "pull_request" ]; then
-              echo ::set-output name=baseURL::/
+              echo "baseURL=/" >> "$GITHUB_OUTPUT"
           elif [[ "${GITHUB_REF}" == refs/tags/* ]]; then
-              echo ::set-output name=baseURL::"/${GITHUB_REF/refs\/tags\//}"
+              echo "baseURL=/${GITHUB_REF/refs\/tags\//}" >> "$GITHUB_OUTPUT"
           else
-              echo ::set-output name=baseURL::/unstable
+              echo "baseURL=/unstable" >> "$GITHUB_OUTPUT"
           fi
 
   build-openapi:
diff --git a/.github/workflows/netlify.yaml b/.github/workflows/netlify.yaml
index 09360720..889d6eed 100644
--- a/.github/workflows/netlify.yaml
+++ b/.github/workflows/netlify.yaml
@@ -32,7 +32,7 @@ jobs:
           pr_number=$(curl -H 'Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' "$pulls_uri" |
                jq -r '.[] | .number')
           echo "PR number: $pr_number"
-          echo "::set-output name=prnumber::$pr_number"
+          echo "prnumber=$pr_number" >> "$GITHUB_OUTPUT"
         
       - name: '📥 Download artifact'
         uses: dawidd6/action-download-artifact@09f2f74827fd3a8607589e5ad7f9398816f540fe # v3.1.4
diff --git a/changelogs/internal/newsfragments/1806.clarification b/changelogs/internal/newsfragments/1806.clarification
new file mode 100644
index 00000000..88b875bb
--- /dev/null
+++ b/changelogs/internal/newsfragments/1806.clarification
@@ -0,0 +1 @@
+Replace `set-output` with environment files in CI.