diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 4d3d4bb..e09261a 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -40,7 +40,6 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: ubuntu-24.04, r: '3.6.3'}
           - {os: ubuntu-24.04, r: '4.1.1'}
           # CRAN submission required to use this R version
           - {os: ubuntu-24.04, r: 'release'}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index f6bcb20..f3f6b10 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -72,49 +72,3 @@ jobs:
       - name: Push commits and tags
         run: |
           git push && git push --tags
-
-      - name: Send message to Slack channel
-        if: success()
-        uses: slackapi/slack-github-action@v1.27.0
-        with:
-          channel-id: 'CSF7TG6N5'
-          payload: |
-            {
-              "blocks": [
-                {
-                  "type": "header",
-                  "text": {
-                    "type": "plain_text",
-                    "text": ":mega: bpmnVisualizationR release ${{ steps.release_version.outputs.version_tag }}",
-                    "emoji": true
-                  }
-                },
-                {
-                  "type": "divider"
-                },
-                {
-                  "type": "section",
-            	  "accessory": {
-                    "type": "image",
-                    "image_url": "https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/R_logo.svg/1448px-R_logo.svg.png",
-                    "alt_text": "Haunted hotel image"
-                  },
-                  "text": {
-                    "type": "mrkdwn",
-                    "text": "- <https://github.com/${{github.repository}}/tree/${{ steps.release_version.outputs.version_tag }}|Tag> done :heavy_check_mark:"
-                  }
-                },
-                {
-                  "type": "divider"
-                },
-                {
-                  "type": "section",
-                  "text": {
-                    "type": "mrkdwn",
-                    "text": "See the next steps <https://github.com/${{github.repository}}/blob/main/MAINTAINERS.md#release-process|here> :arrow_left:"
-                  }
-                }
-              ]
-            }
-        env:
-          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}