diff --git a/.github/actions/build-ci-image/action.yml b/.github/actions/build-ci-image/action.yml
index 8377434b..6b3223f0 100644
--- a/.github/actions/build-ci-image/action.yml
+++ b/.github/actions/build-ci-image/action.yml
@@ -21,6 +21,10 @@ inputs:
   tags:
     default: null
     required: true
+  registry:
+    default: "docker.io"
+    required: true
+    type: string
   username:
     default: null
     required: true
@@ -68,6 +72,7 @@ runs:
     - name: Login to Docker Hub
       uses: docker/login-action@v3
       with:
+        registry: ${{ inputs.registry }}
         username: ${{ inputs.username }}
         password: ${{ inputs.password  }}
 
diff --git a/.github/actions/merge-ci-images/action.yml b/.github/actions/merge-ci-images/action.yml
index 98218095..ed1a2948 100644
--- a/.github/actions/merge-ci-images/action.yml
+++ b/.github/actions/merge-ci-images/action.yml
@@ -10,6 +10,10 @@ inputs:
   tags:
     default: null
     required: true
+  registry:
+    default: "docker.io"
+    required: true
+    type: string
   username:
     default: null
     required: true
@@ -46,6 +50,7 @@ runs:
     - name: Login to Docker Hub
       uses: docker/login-action@v3
       with:
+        registry: ${{ inputs.registry }}
         username: ${{ inputs.username }}
         password: ${{ inputs.password  }}
 
diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index b0e14889..ea0bf352 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -17,7 +17,7 @@ on:
   workflow_dispatch:
 
 env:
-  REGISTRY_IMAGE_ROOT: libfn/ci-build
+  REGISTRY_IMAGE_ROOT: libfn.azurecr.io/ci-build
 
 jobs:
   build:
@@ -59,8 +59,9 @@ jobs:
           tags: |
             type=raw,value=${{ env.RELEASE }}
             type=sha,prefix=${{ env.RELEASE }}-sha-
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: libfn.azurecr.io
+          username: ${{ secrets.AZURECR_NAME }}
+          password: ${{ secrets.AZURECR_PASS }}
           build_args: |
             GCC_RELEASE=${{ env.RELEASE }}
             CLANG_RELEASE=${{ env.RELEASE }}
@@ -104,6 +105,7 @@ jobs:
           tags: |
             type=raw,value=${{ env.RELEASE }}
             type=sha,prefix=${{ env.RELEASE }}-sha-
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: libfn.azurecr.io
+          username: ${{ secrets.AZURECR_NAME }}
+          password: ${{ secrets.AZURECR_PASS }}
           title: "build-${{ env.COMPILER}}-${{ env.RELEASE }}"
diff --git a/.github/workflows/ci-docs.yml b/.github/workflows/ci-docs.yml
index 00bd61a9..503f1d14 100644
--- a/.github/workflows/ci-docs.yml
+++ b/.github/workflows/ci-docs.yml
@@ -17,7 +17,7 @@ on:
   workflow_dispatch:
 
 env:
-  REGISTRY_IMAGE: libfn/ci-docs
+  REGISTRY_IMAGE: libfn.azurecr.io/ci-docs
 
 jobs:
   build:
@@ -44,8 +44,9 @@ jobs:
             type=schedule,pattern={{date 'YYYYMMDD'}}
             type=raw,value=latest,enable={{is_default_branch}}
             type=sha
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: libfn.azurecr.io
+          username: ${{ secrets.AZURECR_NAME }}
+          password: ${{ secrets.AZURECR_PASS }}
           context: "ci/docs"
           title: "docs"
           push: ${{ github.ref_type == 'branch' && github.ref_name == 'main' }}
@@ -69,6 +70,7 @@ jobs:
             type=schedule,pattern={{date 'YYYYMMDD'}}
             type=raw,value=latest,enable={{is_default_branch}}
             type=sha
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: libfn.azurecr.io
+          username: ${{ secrets.AZURECR_NAME }}
+          password: ${{ secrets.AZURECR_PASS }}
           title: "docs"
diff --git a/.github/workflows/ci-pre-commit.yml b/.github/workflows/ci-pre-commit.yml
index 4919152f..34647771 100644
--- a/.github/workflows/ci-pre-commit.yml
+++ b/.github/workflows/ci-pre-commit.yml
@@ -17,7 +17,7 @@ on:
   workflow_dispatch:
 
 env:
-  REGISTRY_IMAGE: libfn/ci-pre-commit
+  REGISTRY_IMAGE: libfn.azurecr.io/ci-pre-commit
 
 jobs:
   build:
@@ -44,8 +44,9 @@ jobs:
             type=schedule,pattern={{date 'YYYYMMDD'}}
             type=raw,value=latest,enable={{is_default_branch}}
             type=sha
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: libfn.azurecr.io
+          username: ${{ secrets.AZURECR_NAME }}
+          password: ${{ secrets.AZURECR_PASS }}
           context: "ci/pre-commit"
           title: "pre-commit"
           push: ${{ github.ref_type == 'branch' && github.ref_name == 'main' }}
@@ -69,6 +70,7 @@ jobs:
             type=schedule,pattern={{date 'YYYYMMDD'}}
             type=raw,value=latest,enable={{is_default_branch}}
             type=sha
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: libfn.azurecr.io
+          username: ${{ secrets.AZURECR_NAME }}
+          password: ${{ secrets.AZURECR_PASS }}
           title: "pre-commit"