diff --git a/.github/workflows/coq-action.yml b/.github/workflows/coq-action.yml
index 4b4ba9b..f503da8 100644
--- a/.github/workflows/coq-action.yml
+++ b/.github/workflows/coq-action.yml
@@ -19,11 +19,13 @@ jobs:
     strategy:
       matrix:
         image:
-          - mathcomp/mathcomp:2.0.0-coq-8.16
-          - mathcomp/mathcomp:2.0.0-coq-8.17
-          - mathcomp/mathcomp:2.0.0-coq-dev
+          - mathcomp/mathcomp:2.1.0-coq-8.16
+          - mathcomp/mathcomp:2.1.0-coq-8.17
+          - mathcomp/mathcomp:2.1.0-coq-8.18
+          - mathcomp/mathcomp:2.1.0-coq-dev
           - mathcomp/mathcomp-dev:coq-8.16
           - mathcomp/mathcomp-dev:coq-8.17
+          - mathcomp/mathcomp-dev:coq-8.18
           - mathcomp/mathcomp-dev:coq-dev
       fail-fast: false
     steps:
diff --git a/.github/workflows/nix-action-8.16.yml b/.github/workflows/nix-action-8.16.yml
index ba8f12e..61b435c 100644
--- a/.github/workflows/nix-action-8.16.yml
+++ b/.github/workflows/nix-action-8.16.yml
@@ -40,8 +40,8 @@ jobs:
       name: Checking presence of CI target coq
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"8.16\" --argstr job \"coq\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: Building/fetching current CI target
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.16" --argstr
@@ -88,8 +88,8 @@ jobs:
       name: Checking presence of CI target mathcomp
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"8.16\" --argstr job \"mathcomp\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: 'Building/fetching previous CI target: coq'
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.16" --argstr
@@ -173,8 +173,8 @@ jobs:
       name: Checking presence of CI target odd-order
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"8.16\" --argstr job \"odd-order\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: 'Building/fetching previous CI target: coq'
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.16" --argstr
@@ -215,8 +215,10 @@ name: Nix CI for bundle 8.16
 'on':
   pull_request:
     paths:
-    - .github/workflows/**
+    - .github/workflows/nix-action-8.16.yml
   pull_request_target:
+    paths-ignore:
+    - .github/workflows/nix-action-8.16.yml
     types:
     - opened
     - synchronize
diff --git a/.github/workflows/nix-action-8.17.yml b/.github/workflows/nix-action-8.17.yml
index 10af548..b838ed5 100644
--- a/.github/workflows/nix-action-8.17.yml
+++ b/.github/workflows/nix-action-8.17.yml
@@ -40,8 +40,8 @@ jobs:
       name: Checking presence of CI target coq
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"8.17\" --argstr job \"coq\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: Building/fetching current CI target
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.17" --argstr
@@ -88,8 +88,8 @@ jobs:
       name: Checking presence of CI target mathcomp
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"8.17\" --argstr job \"mathcomp\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: 'Building/fetching previous CI target: coq'
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.17" --argstr
@@ -173,8 +173,8 @@ jobs:
       name: Checking presence of CI target odd-order
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"8.17\" --argstr job \"odd-order\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: 'Building/fetching previous CI target: coq'
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.17" --argstr
@@ -215,8 +215,10 @@ name: Nix CI for bundle 8.17
 'on':
   pull_request:
     paths:
-    - .github/workflows/**
+    - .github/workflows/nix-action-8.17.yml
   pull_request_target:
+    paths-ignore:
+    - .github/workflows/nix-action-8.17.yml
     types:
     - opened
     - synchronize
diff --git a/.github/workflows/nix-action-8.18.yml b/.github/workflows/nix-action-8.18.yml
new file mode 100644
index 0000000..e6d15f5
--- /dev/null
+++ b/.github/workflows/nix-action-8.18.yml
@@ -0,0 +1,228 @@
+jobs:
+  coq:
+    needs: []
+    runs-on: ubuntu-latest
+    steps:
+    - name: Determine which commit to initially checkout
+      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"target_commit=${{\
+        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  echo \"target_commit=${{ github.event.pull_request.head.sha\
+        \ }}\" >> $GITHUB_ENV\nfi\n"
+    - name: Git checkout
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+        ref: ${{ env.target_commit }}
+    - name: Determine which commit to test
+      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"tested_commit=${{\
+        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  merge_commit=$(git ls-remote ${{\
+        \ github.event.repository.html_url }} refs/pull/${{ github.event.number }}/merge\
+        \ | cut -f1)\n  mergeable=$(git merge --no-commit --no-ff ${{ github.event.pull_request.base.sha\
+        \ }} > /dev/null 2>&1; echo $?; git merge --abort > /dev/null 2>&1 || true)\n\
+        \  if [ -z \"$merge_commit\" -o \"x$mergeable\" != \"x0\" ]; then\n    echo\
+        \ \"tested_commit=${{ github.event.pull_request.head.sha }}\" >> $GITHUB_ENV\n\
+        \  else\n    echo \"tested_commit=$merge_commit\" >> $GITHUB_ENV\n  fi\nfi\n"
+    - name: Git checkout
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+        ref: ${{ env.tested_commit }}
+    - name: Cachix install
+      uses: cachix/install-nix-action@v20
+      with:
+        nix_path: nixpkgs=channel:nixpkgs-unstable
+    - name: Cachix setup math-comp
+      uses: cachix/cachix-action@v12
+      with:
+        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+        extraPullNames: coq, coq-community
+        name: math-comp
+    - id: stepCheck
+      name: Checking presence of CI target coq
+      run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
+        \ bundle \"8.18\" --argstr job \"coq\" \\\n   --dry-run 2>&1 > /dev/null)\n\
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: Building/fetching current CI target
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "coq"
+  mathcomp:
+    needs:
+    - coq
+    runs-on: ubuntu-latest
+    steps:
+    - name: Determine which commit to initially checkout
+      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"target_commit=${{\
+        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  echo \"target_commit=${{ github.event.pull_request.head.sha\
+        \ }}\" >> $GITHUB_ENV\nfi\n"
+    - name: Git checkout
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+        ref: ${{ env.target_commit }}
+    - name: Determine which commit to test
+      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"tested_commit=${{\
+        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  merge_commit=$(git ls-remote ${{\
+        \ github.event.repository.html_url }} refs/pull/${{ github.event.number }}/merge\
+        \ | cut -f1)\n  mergeable=$(git merge --no-commit --no-ff ${{ github.event.pull_request.base.sha\
+        \ }} > /dev/null 2>&1; echo $?; git merge --abort > /dev/null 2>&1 || true)\n\
+        \  if [ -z \"$merge_commit\" -o \"x$mergeable\" != \"x0\" ]; then\n    echo\
+        \ \"tested_commit=${{ github.event.pull_request.head.sha }}\" >> $GITHUB_ENV\n\
+        \  else\n    echo \"tested_commit=$merge_commit\" >> $GITHUB_ENV\n  fi\nfi\n"
+    - name: Git checkout
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+        ref: ${{ env.tested_commit }}
+    - name: Cachix install
+      uses: cachix/install-nix-action@v20
+      with:
+        nix_path: nixpkgs=channel:nixpkgs-unstable
+    - name: Cachix setup math-comp
+      uses: cachix/cachix-action@v12
+      with:
+        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+        extraPullNames: coq, coq-community
+        name: math-comp
+    - id: stepCheck
+      name: Checking presence of CI target mathcomp
+      run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
+        \ bundle \"8.18\" --argstr job \"mathcomp\" \\\n   --dry-run 2>&1 > /dev/null)\n\
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: coq'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "coq"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: coq-elpi'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "coq-elpi"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: hierarchy-builder'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "hierarchy-builder"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-ssreflect'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-ssreflect"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-fingroup'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-fingroup"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-algebra'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-algebra"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-solvable'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-solvable"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-field'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-field"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-character'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-character"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: Building/fetching current CI target
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp"
+  odd-order:
+    needs:
+    - coq
+    - mathcomp
+    runs-on: ubuntu-latest
+    steps:
+    - name: Determine which commit to initially checkout
+      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"target_commit=${{\
+        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  echo \"target_commit=${{ github.event.pull_request.head.sha\
+        \ }}\" >> $GITHUB_ENV\nfi\n"
+    - name: Git checkout
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+        ref: ${{ env.target_commit }}
+    - name: Determine which commit to test
+      run: "if [ ${{ github.event_name }} = \"push\" ]; then\n  echo \"tested_commit=${{\
+        \ github.sha }}\" >> $GITHUB_ENV\nelse\n  merge_commit=$(git ls-remote ${{\
+        \ github.event.repository.html_url }} refs/pull/${{ github.event.number }}/merge\
+        \ | cut -f1)\n  mergeable=$(git merge --no-commit --no-ff ${{ github.event.pull_request.base.sha\
+        \ }} > /dev/null 2>&1; echo $?; git merge --abort > /dev/null 2>&1 || true)\n\
+        \  if [ -z \"$merge_commit\" -o \"x$mergeable\" != \"x0\" ]; then\n    echo\
+        \ \"tested_commit=${{ github.event.pull_request.head.sha }}\" >> $GITHUB_ENV\n\
+        \  else\n    echo \"tested_commit=$merge_commit\" >> $GITHUB_ENV\n  fi\nfi\n"
+    - name: Git checkout
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+        ref: ${{ env.tested_commit }}
+    - name: Cachix install
+      uses: cachix/install-nix-action@v20
+      with:
+        nix_path: nixpkgs=channel:nixpkgs-unstable
+    - name: Cachix setup math-comp
+      uses: cachix/cachix-action@v12
+      with:
+        authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+        extraPullNames: coq, coq-community
+        name: math-comp
+    - id: stepCheck
+      name: Checking presence of CI target odd-order
+      run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
+        \ bundle \"8.18\" --argstr job \"odd-order\" \\\n   --dry-run 2>&1 > /dev/null)\n\
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: coq'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "coq"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-character'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-character"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-ssreflect'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-ssreflect"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-fingroup'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-fingroup"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-algebra'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-algebra"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-solvable'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-solvable"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp-field'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp-field"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: 'Building/fetching previous CI target: mathcomp'
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "mathcomp"
+    - if: steps.stepCheck.outputs.status == 'built'
+      name: Building/fetching current CI target
+      run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "8.18" --argstr
+        job "odd-order"
+name: Nix CI for bundle 8.18
+'on':
+  pull_request:
+    paths:
+    - .github/workflows/nix-action-8.18.yml
+  pull_request_target:
+    paths-ignore:
+    - .github/workflows/nix-action-8.18.yml
+    types:
+    - opened
+    - synchronize
+    - reopened
+  push:
+    branches:
+    - master
diff --git a/.github/workflows/nix-action-master.yml b/.github/workflows/nix-action-master.yml
index bce33de..1b14be7 100644
--- a/.github/workflows/nix-action-master.yml
+++ b/.github/workflows/nix-action-master.yml
@@ -40,8 +40,8 @@ jobs:
       name: Checking presence of CI target coq
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"master\" --argstr job \"coq\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: Building/fetching current CI target
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
@@ -88,8 +88,8 @@ jobs:
       name: Checking presence of CI target coq-elpi
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"master\" --argstr job \"coq-elpi\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: 'Building/fetching previous CI target: coq'
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
@@ -141,8 +141,8 @@ jobs:
       name: Checking presence of CI target hierarchy-builder
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"master\" --argstr job \"hierarchy-builder\" \\\n   --dry-run 2>&1\
-        \ > /dev/null)\necho $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run\
-        \ | grep \"built:\" | sed \"s/.*/built/\")\n"
+        \ > /dev/null)\necho $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"\
+        built:\" | sed \"s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: 'Building/fetching previous CI target: coq'
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
@@ -199,8 +199,8 @@ jobs:
       name: Checking presence of CI target mathcomp
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"master\" --argstr job \"mathcomp\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: 'Building/fetching previous CI target: coq'
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
@@ -284,8 +284,8 @@ jobs:
       name: Checking presence of CI target odd-order
       run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
         \ bundle \"master\" --argstr job \"odd-order\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho ::set-output name=status::$(echo $nb_dry_run | grep\
-        \ \"built:\" | sed \"s/.*/built/\")\n"
+        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+        s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: 'Building/fetching previous CI target: coq'
       run: NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link --argstr bundle "master"
@@ -326,8 +326,10 @@ name: Nix CI for bundle master
 'on':
   pull_request:
     paths:
-    - .github/workflows/**
+    - .github/workflows/nix-action-master.yml
   pull_request_target:
+    paths-ignore:
+    - .github/workflows/nix-action-master.yml
     types:
     - opened
     - synchronize
diff --git a/.nix/config.nix b/.nix/config.nix
index 0c18bdb..dff67eb 100644
--- a/.nix/config.nix
+++ b/.nix/config.nix
@@ -30,23 +30,27 @@
 
   ## select an entry to build in the following `bundles` set
   ## defaults to "default"
-  default-bundle = "8.16";
+  default-bundle = "8.18";
 
   ## write one `bundles.name` attribute set per
   ## alternative configuration, the can be used to
   ## compute several ci jobs as well
   bundles."8.16".coqPackages = {
     coq.override.version = "8.16";
-    mathcomp.override.version = "mathcomp-2.0.0";
+    mathcomp.override.version = "mathcomp-2.1.0";
   };
   bundles."8.17".coqPackages = {
     coq.override.version = "8.17";
-    mathcomp.override.version = "mathcomp-2.0.0";
+    mathcomp.override.version = "mathcomp-2.1.0";
+  };
+  bundles."8.18".coqPackages = {
+    coq.override.version = "8.18";
+    mathcomp.override.version = "mathcomp-2.1.0";
   };
   bundles."master".coqPackages = {
     coq.override.version = "master";
     coq-elpi.override.version = "coq-master";
-    hierarchy-builder.override.version = "proux01:coq-master";
+    hierarchy-builder.override.version = "master";
     mathcomp.override.version = "master";
   };
 
diff --git a/.nix/coq-nix-toolbox.nix b/.nix/coq-nix-toolbox.nix
index 3836be9..b56aee1 100644
--- a/.nix/coq-nix-toolbox.nix
+++ b/.nix/coq-nix-toolbox.nix
@@ -1 +1 @@
-"8893994e8efdbbf72ec4e3eaf84ea676b77ef38f"
+"2d8c43d336716fea48267d8259c645e870883361"