diff --git a/.github/workflows/CompatHelper.yml b/.github/workflows/CompatHelper.yml
index bcdb51a..688c5c4 100644
--- a/.github/workflows/CompatHelper.yml
+++ b/.github/workflows/CompatHelper.yml
@@ -1,16 +1,25 @@
 name: CompatHelper
 on:
   schedule:
-    - cron: '00 00 * * *'
+    - cron: 0 0 * * *
   workflow_dispatch:
 jobs:
   CompatHelper:
     runs-on: ubuntu-latest
     steps:
-      - name: Pkg.add("CompatHelper")
-        run: julia -e 'using Pkg; Pkg.add("CompatHelper")'
-      - name: CompatHelper.main()
+      - name: "Install CompatHelper"
+        run: |
+          import Pkg
+          name = "CompatHelper"
+          uuid = "aa819f21-2bde-4658-8897-bab36330d9b7"
+          version = "3"
+          Pkg.add(; name, uuid, version)
+        shell: julia --color=yes {0}
+      - name: "Run CompatHelper"
+        run: |
+          import CompatHelper
+          CompatHelper.main()
+        shell: julia --color=yes {0}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          COMPATHELPER_PRIV: ${{ secrets.COMPATHELPER_PRIV }}  # optional
-        run: julia -e 'using CompatHelper; CompatHelper.main()'
+          COMPATHELPER_PRIV: ${{ secrets.DOCUMENTER_KEY }}
diff --git a/.github/workflows/DocsPreviewCleanup.yml b/.github/workflows/DocsPreviewCleanup.yml
new file mode 100644
index 0000000..6420be9
--- /dev/null
+++ b/.github/workflows/DocsPreviewCleanup.yml
@@ -0,0 +1,26 @@
+name: Docs Preview Cleanup
+
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  docs-preview-cleanup:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout gh-pages branch
+        uses: actions/checkout@v2
+        with:
+          ref: gh-pages
+      - name: Delete preview and history + push changes
+        run: |
+            if [ -d "previews/PR$PRNUM" ]; then
+              git config user.name "Documenter.jl"
+              git config user.email "documenter@juliadocs.github.io"
+              git rm -rf "previews/PR$PRNUM"
+              git commit -m "delete preview"
+              git branch gh-pages-new $(echo "delete history" | git commit-tree HEAD^{tree})
+              git push --force origin gh-pages-new:gh-pages
+            fi
+        env:
+            PRNUM: ${{ github.event.number }}
diff --git a/.github/workflows/TagBot.yml b/.github/workflows/TagBot.yml
index d77d3a0..ed607f7 100644
--- a/.github/workflows/TagBot.yml
+++ b/.github/workflows/TagBot.yml
@@ -2,10 +2,16 @@ name: TagBot
 on:
   schedule:
     - cron: 0 * * * *
+  issue_comment:
+    types:
+      - created
+  workflow_dispatch:
 jobs:
   TagBot:
+    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
     runs-on: ubuntu-latest
     steps:
       - uses: JuliaRegistries/TagBot@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          ssh: ${{ secrets.DOCUMENTER_KEY }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5e211b2..dbca8a0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,5 @@
 name: CI
+
 on:
   pull_request:
     branches:
@@ -7,6 +8,13 @@ on:
     branches:
       - master
     tags: '*'
+
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
@@ -42,6 +50,8 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v1
+        continue-on-error: true
+      - uses: codecov/codecov-action@v2
+        continue-on-error: true
         with:
           file: lcov.info
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 2763219..a42659c 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -1,10 +1,18 @@
 name: Documentation
+
 on:
   push:
     branches:
       - master
     tags: '*'
   pull_request:
+
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -12,7 +20,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@latest
         with:
-          version: '1.5'
+          version: '1'
       - name: Install dependencies
         run: julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
       - name: Build and deploy
diff --git a/.github/workflows/downstream.yml b/.github/workflows/downstream.yml
index 7af4f84..b4e2f48 100644
--- a/.github/workflows/downstream.yml
+++ b/.github/workflows/downstream.yml
@@ -1,10 +1,17 @@
 name: IntegrationTest
+
 on:
   push:
     branches: [master]
     tags: [v*]
   pull_request:
 
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
 jobs:
   test:
     name: ${{ matrix.package.repo }}/${{ matrix.package.group }}
diff --git a/docs/make.jl b/docs/make.jl
index a2aee17..23f89bd 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -9,4 +9,4 @@ makedocs(modules=[DiffRules],
          ),
 )
 
-deploydocs(repo = "github.com/JuliaDiff/DiffRules.jl")
+deploydocs(; repo="github.com/JuliaDiff/DiffRules.jl", push_preview=true)