diff --git a/.github/Dockerfile b/.github/Dockerfile
index eefec40f..0256694c 100644
--- a/.github/Dockerfile
+++ b/.github/Dockerfile
@@ -1,4 +1,4 @@
-FROM coqorg/coq:8.17.1
+FROM coqorg/coq:8.17.1-ocaml-4.14.1-flambda
 
 ENV NCPUS=4
 ENV OPAMYES="true"
diff --git a/.github/workflows/ci_build.yaml b/.github/workflows/ci_build.yaml
new file mode 100644
index 00000000..98d730b0
--- /dev/null
+++ b/.github/workflows/ci_build.yaml
@@ -0,0 +1,75 @@
+name: CI build
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+env:
+  REGISTRY: "ghcr.io"
+  IMAGE_TAG: "beluga-lang/mcltt:main"
+      
+jobs:
+  wf:
+    name: Completeness of _CoqProject
+    runs-on: ubuntu-latest
+    steps:
+      - name: repo checkout
+        uses: actions/checkout@v3
+      - name: check
+        run: |
+          .github/scripts/check_projects.sh theories
+
+  build:
+    name: Continuous Intergration
+    runs-on: ubuntu-latest
+    permissions:
+      packages: read
+    steps:
+      - name: get number of CPU cores
+        uses: SimenB/github-actions-cpu-cores@v2
+        id: cpu-cores
+
+      - name: repo checkout
+        uses: actions/checkout@v3
+
+      - name: container registry log in
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: image pre-pulling
+        run: docker pull ${{ env.REGISTRY }}/${{ env.IMAGE_TAG }}
+
+      - name: coq processing
+        uses: coq-community/docker-coq-action@v1
+        with:
+          custom_image: ${{ env.REGISTRY }}/${{ env.IMAGE_TAG }}
+          install: |
+          before_script: |
+            startGroup "Fix the permission issue"
+              sudo chown -R coq:coq .
+            endGroup
+          script: |
+            startGroup "Build Coq lib"
+              cd theories/
+              make -j ${{ steps.cpu-cores.outputs.count }} pretty-timed
+            endGroup
+          after_script: |
+            startGroup "Test parser"
+              dune build
+              dune runtest
+            endGroup
+          export: "OPAMJOBS OPAMYES"
+        env:
+          OPAMJOBS: ${{ steps.cpu-cores.outputs.count }}
+          OPAMYES: "true"
+
+      - name: permissions revert
+        # to avoid a warning at cleanup time
+        if: ${{ always() }}
+        run: sudo chown -R 1001:116 .
diff --git a/.github/workflows/ci_build.yml b/.github/workflows/ci_build.yml
deleted file mode 100644
index 9e2762a9..00000000
--- a/.github/workflows/ci_build.yml
+++ /dev/null
@@ -1,63 +0,0 @@
-name: CI build
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-
-env:
-  OCAML_VER: "4.14.0"
-  COQ_VER: "8.17.1"
-      
-jobs:
-  wf:
-    name: Completeness of _CoqProject
-    runs-on: ubuntu-latest
-    steps:
-      - name: repo checkout
-        uses: actions/checkout@v3
-      - name: check
-        run: |
-          .github/scripts/check_projects.sh theories
-    
-  build:
-    name: Continuous Intergration
-    runs-on: ubuntu-latest
-    steps:
-      - name: Get number of CPU cores
-        uses: SimenB/github-actions-cpu-cores@v2
-        id: cpu-cores
-      - name: repo checkout
-        uses: actions/checkout@v3
-      - name: setup OCaml
-        uses: ocaml/setup-ocaml@v2
-        with:
-          ocaml-compiler: ${{ env.OCAML_VER }}
-          dune-cache: true
-          cache-prefix: "v2.2"
-      - name: install Menhir and Coq
-        run: |
-          opam update
-          opam install menhir
-          opam pin add coq "${{ env.COQ_VER }}"
-      - name: install Coq dependencies
-        run: |
-          opam repo add coq-released https://coq.inria.fr/opam/released
-          opam update
-          opam install coq-equations
-          opam install coq-menhirlib
-          opam install ppx_inline_test
-        env:
-          OPAMYES: "true"
-      - name: build lib
-        run: |
-          eval $(opam env)
-          cd theories/
-          make -j ${{ steps.cpu-cores.outputs.count }} pretty-timed
-      - name: test parser
-        run: |
-          eval $(opam env)
-          dune build
-          dune runtest
diff --git a/README.md b/README.md
index 0cd82b18..ba2f4792 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ implementation.
 
 ## Dependencies
 
-* OCaml 4.14.0
+* OCaml 4.14.1
 * Menhir
 * coq-menhirlib
 * Coq 8.17.1
@@ -56,7 +56,7 @@ implementation.
 We recommend to install dependencies in the following way:
 
 ```bash
-opam switch create coq-8.17.1 4.14.0
+opam switch create coq-8.17.1 4.14.1
 opam install menhir
 opam pin add coq 8.17.1
 opam repo add coq-released https://coq.inria.fr/opam/released