diff --git a/.github/actions/e2e_test/action.yml b/.github/actions/e2e_test/action.yml
index 0c1c426b0..7457a0ab1 100644
--- a/.github/actions/e2e_test/action.yml
+++ b/.github/actions/e2e_test/action.yml
@@ -32,7 +32,7 @@ inputs:
   gcpProject:
     description: "The GCP project to deploy Constellation in."
     required: false
-  gcp_service_account_json:
+  gcp_service_account:
     description: "Service account with permissions to create Constellation on GCP."
     required: false
   gcpClusterServiceAccountKey:
@@ -129,7 +129,7 @@ runs:
       if: inputs.cloudProvider == 'gcp'
       uses: ./.github/actions/login_gcp
       with:
-        gcp_service_account_json: ${{ inputs.gcp_service_account_json }}
+        service_account: ${{ inputs.gcp_service_account }}
 
     - name: Login to AWS
       if: inputs.cloudProvider == 'aws'
diff --git a/.github/actions/login_gcp/action.yml b/.github/actions/login_gcp/action.yml
index c705eae40..86a301e38 100644
--- a/.github/actions/login_gcp/action.yml
+++ b/.github/actions/login_gcp/action.yml
@@ -1,8 +1,8 @@
 name: GCP login
 description: "Login to GCP & configure gcloud CLI."
 inputs:
-  gcp_service_account_json:
-    description: "Service account with permissions to create Constellation on GCP."
+  service_account:
+    description: "GCP service account name. Format: <account-name>@<project-name>.iam.gserviceaccount.com"
     required: true
 runs:
   using: "composite"
@@ -12,7 +12,8 @@ runs:
     - name: Authorize GCP access
       uses: google-github-actions/auth@ef5d53e30bbcd8d0836f4288f5e50ff3e086997d # v1.0.0
       with:
-        credentials_json: ${{ inputs.gcp_service_account_json }}
+        workload_identity_provider: projects/796962942582/locations/global/workloadIdentityPools/constellation-ci-pool/providers/constellation-ci-provider
+        service_account: ${{ inputs.service_account }}
 
     # Even if preinstalled in Github Actions runner image, this setup does some magic authentication required for gsutil.
     - name: Set up Cloud SDK
diff --git a/.github/workflows/build-os-image.yml b/.github/workflows/build-os-image.yml
index 65a6bd140..2988f801c 100644
--- a/.github/workflows/build-os-image.yml
+++ b/.github/workflows/build-os-image.yml
@@ -422,7 +422,7 @@ jobs:
         uses: ./.github/actions/login_gcp
         if: matrix.csp == 'gcp'
         with:
-          gcp_service_account_json: ${{ secrets.GCP_IMAGE_UPLOAD_SERVICE_ACCOUNT }}
+          service_account: "constellation-cos-builder@constellation-331613.iam.gserviceaccount.com"
 
       - name: Prepare PKI for image upload
         id: prepare-pki
diff --git a/.github/workflows/e2e-test-daily.yml b/.github/workflows/e2e-test-daily.yml
index 38cc9af89..470e93936 100644
--- a/.github/workflows/e2e-test-daily.yml
+++ b/.github/workflows/e2e-test-daily.yml
@@ -93,7 +93,7 @@ jobs:
           azureUserAssignedIdentity: ${{ secrets.AZURE_E2E_USER_ASSIGNED_IDENTITY }}
           azureResourceGroup: ${{ steps.az_resource_group_gen.outputs.res_group_name }}
           gcpProject: ${{ secrets.GCP_E2E_PROJECT }}
-          gcp_service_account_json: ${{ secrets.GCP_SERVICE_ACCOUNT }}
+          gcp_service_account: "constellation-e2e@constellation-331613.iam.gserviceaccount.com"
           gcpClusterServiceAccountKey: ${{ secrets.GCP_CLUSTER_SERVICE_ACCOUNT }}
           test: "sonobuoy full"
 
diff --git a/.github/workflows/e2e-test-manual.yml b/.github/workflows/e2e-test-manual.yml
index abb04b444..9584256f8 100644
--- a/.github/workflows/e2e-test-manual.yml
+++ b/.github/workflows/e2e-test-manual.yml
@@ -279,7 +279,7 @@ jobs:
           cloudProvider: ${{ inputs.cloudProvider }}
           machineType: ${{ inputs.machineType }}
           gcpProject: ${{ secrets.GCP_E2E_PROJECT }}
-          gcp_service_account_json: ${{ secrets.GCP_SERVICE_ACCOUNT }}
+          gcp_service_account: "constellation-e2e@constellation-331613.iam.gserviceaccount.com"
           gcpClusterServiceAccountKey: ${{ secrets.GCP_CLUSTER_SERVICE_ACCOUNT }}
           test: ${{ inputs.test }}
           kubernetesVersion: ${{ inputs.kubernetesVersion }}
diff --git a/.github/workflows/e2e-test-weekly.yml b/.github/workflows/e2e-test-weekly.yml
index 5ae60ef3e..45a75dccb 100644
--- a/.github/workflows/e2e-test-weekly.yml
+++ b/.github/workflows/e2e-test-weekly.yml
@@ -131,7 +131,7 @@ jobs:
           azureUserAssignedIdentity: ${{ secrets.AZURE_E2E_USER_ASSIGNED_IDENTITY }}
           azureResourceGroup: ${{ steps.az_resource_group_gen.outputs.res_group_name }}
           gcpProject: ${{ secrets.GCP_E2E_PROJECT }}
-          gcp_service_account_json: ${{ secrets.GCP_SERVICE_ACCOUNT }}
+          gcp_service_account: "constellation-e2e@constellation-331613.iam.gserviceaccount.com"
           gcpClusterServiceAccountKey: ${{ secrets.GCP_CLUSTER_SERVICE_ACCOUNT }}
           test: ${{ matrix.test }}
 
diff --git a/.github/workflows/generate-measurements.yml b/.github/workflows/generate-measurements.yml
index 76f597530..9758118ad 100644
--- a/.github/workflows/generate-measurements.yml
+++ b/.github/workflows/generate-measurements.yml
@@ -120,7 +120,7 @@ jobs:
           controlNodesCount: 1
           cloudProvider: ${{ matrix.provider }}
           gcpProject: ${{ secrets.GCP_E2E_PROJECT }}
-          gcp_service_account_json: ${{ secrets.GCP_SERVICE_ACCOUNT }}
+          gcp_service_account: "constellation-e2e@constellation-331613.iam.gserviceaccount.com"
           gcpClusterServiceAccountKey: ${{ secrets.GCP_CLUSTER_SERVICE_ACCOUNT }}
           azureSubscription: ${{ secrets.AZURE_E2E_SUBSCRIPTION_ID }}
           azureTenant: ${{ secrets.AZURE_E2E_TENANT_ID }}
diff --git a/.github/workflows/versionsapi.yml b/.github/workflows/versionsapi.yml
index d42fd5aa4..70b0cc15b 100644
--- a/.github/workflows/versionsapi.yml
+++ b/.github/workflows/versionsapi.yml
@@ -170,7 +170,7 @@ jobs:
         if: steps.check-rights.outputs.auth == 'true'
         uses: ./.github/actions/login_gcp
         with:
-          gcp_service_account_json: ${{ secrets.GCP_IMAGE_UPLOAD_SERVICE_ACCOUNT }}
+          service_account: "constellation-cos-builder@constellation-331613.iam.gserviceaccount.com"
 
       - name: Execute versionsapi CLI
         id: run