diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 669e956..5fba4cb 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -56,7 +56,12 @@ jobs:
         uses: step-security/harden-runner@4d991eb9b905ef189e4c376166672c3f2f230481 # v2.11.0
         with:
           disable-sudo: true
-          egress-policy: audit
+          egress-policy: block
+          allowed-endpoints: >
+            api.github.com:443
+            github.com:443
+            objects.githubusercontent.com:443
+            uploads.github.com:443
 
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index 5a1e406..12ef219 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -24,6 +24,7 @@ jobs:
           allowed-endpoints: >
             api.deps.dev:443
             api.github.com:443
+            api.securityscorecards.dev:443
             github.com:443
 
       - name: Checkout Repository
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4f484db..538e912 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -33,7 +33,12 @@ jobs:
       - name: Harden Runner
         uses: step-security/harden-runner@4d991eb9b905ef189e4c376166672c3f2f230481 # v2.11.0
         with:
-          egress-policy: audit
+          disable-sudo: true
+          egress-policy: block
+          allowed-endpoints: >
+            files.pythonhosted.org:443
+            github.com:443
+            pypi.org:443
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
@@ -72,7 +77,16 @@ jobs:
       - name: Harden Runner
         uses: step-security/harden-runner@4d991eb9b905ef189e4c376166672c3f2f230481 # v2.11.0
         with:
-          egress-policy: audit
+          disable-sudo: true
+          egress-policy: block
+          allowed-endpoints: >
+            coveralls.io:443
+            docs.scipy.org:443
+            files.pythonhosted.org:443
+            github.com:443
+            pandas.pydata.org:443
+            pypi.org:443
+            raw.githubusercontent.com:443
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
@@ -114,7 +128,17 @@ jobs:
       - name: Harden Runner
         uses: step-security/harden-runner@4d991eb9b905ef189e4c376166672c3f2f230481 # v2.11.0
         with:
-          egress-policy: audit
+          disable-sudo: true
+          egress-policy: block
+          allowed-endpoints: >
+            conda.anaconda.org:443
+            coveralls.io:443
+            files.pythonhosted.org:443
+            github.com:443
+            objects.githubusercontent.com:443
+            pypi.org:443
+            raw.githubusercontent.com:443
+            repo.anaconda.com:443
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
@@ -127,10 +151,6 @@ jobs:
           environment-file: environment-dev.yml
           create-args: >-
             python=${{ matrix.python-version }}
-#      - name: Install xclim development version
-#        run: |
-#          echo "Installing xclim from main branch until version 0.53.0+ is released"
-#          python -m pip install git+https://github.com/Ouranosinc/xclim.git@main
       - name: Install xsdba
         run: |
           python -m pip install --no-deps .
@@ -160,7 +180,11 @@ jobs:
         uses: step-security/harden-runner@4d991eb9b905ef189e4c376166672c3f2f230481 # v2.11.0
         with:
           disable-sudo: true
-          egress-policy: audit
+          egress-policy: block
+          allowed-endpoints: >
+            coveralls.io:443
+            github.com:443
+            objects.githubusercontent.com:443
       - name: Coveralls Finished
         uses: coverallsapp/github-action@648a8eb78e6d50909eff900e4ec85cab4524a45b # v2.3.6
         with:
diff --git a/.github/workflows/upstream.yml b/.github/workflows/upstream.yml
new file mode 100644
index 0000000..19b9f81
--- /dev/null
+++ b/.github/workflows/upstream.yml
@@ -0,0 +1,112 @@
+name: Test Upstream Dependencies
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - CHANGELOG.rst
+      - README.rst
+      - pyproject.toml
+      - src/xsdba/__init__.py
+  schedule:
+    - cron: "0 0 * * *" # Daily “At 00:00” UTC
+  workflow_dispatch: # allows you to trigger the workflow run manually
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  upstream-dev:
+    name: test-upstream-dev (Python${{ matrix.python-version }})
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    if: |
+      (github.event_name == 'schedule') ||
+      (github.event_name == 'workflow_dispatch') ||
+      (github.event_name == 'push')
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [ "3.12" ]
+        testdata-cache: [ '~/.cache/xclim-testdata' ]
+    defaults:
+      run:
+        shell: bash -l {0}
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@cb605e52c26070c328afc4562f0b4ada7618a84e # v2.10.4
+        with:
+          disable-sudo: true
+          egress-policy: audit
+      - name: Start Measurement
+        uses: green-coding-solutions/eco-ci-energy-estimation@e79d33b08b0c47de4438c161d432730fce23f246 # v4.2.0
+        with:
+          task: start-measurement
+          branch: ${{ github.head_ref || github.ref_name }}
+      - name: Checkout Repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+      - name: Setup Conda (Micromamba) with Python${{ matrix.python-version }}
+        uses: mamba-org/setup-micromamba@0dea6379afdaffa5d528b3d1dabc45da37f443fc # v2.0.4
+        with:
+          cache-downloads: true
+          cache-environment: true
+          environment-file: environment.yml
+          create-args: >-
+            pytest-reportlog
+            python=${{ matrix.python-version }}
+      - name: Install upstream versions
+        run: |
+          # git-based dependencies cannot be installed from hashes
+          python -m pip install -r CI/requirements_upstream.txt
+      - name: Install xsdba
+        run: |
+          python -m pip install --no-user --no-deps --editable .
+      - name: Check versions
+        run: |
+          micromamba list
+          python -m pip check || true
+      - name: Setup Python Measurement
+        uses: green-coding-solutions/eco-ci-energy-estimation@e79d33b08b0c47de4438c161d432730fce23f246 # v4.2.0
+        with:
+          task: get-measurement
+          label: 'Environment Setup (Upstream, Python${{ matrix.python-version }})'
+        continue-on-error: true
+      - name: Test Data Caching
+        uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
+        with:
+          path: |
+            ${{ matrix.testdata-cache }}
+          key: ${{ runner.os }}-xclim-testdata-upstream-${{ hashFiles('pyproject.toml', 'tox.ini') }}
+      - name: Run Tests
+        if: success()
+        id: status
+        run: |
+          python -m pytest --numprocesses=logical --durations=10 --cov=xsdba --cov-report=term-missing --report-log output-${{ matrix.python-version }}-log.jsonl
+      - name: Generate and publish the report
+        if: |
+          failure()
+          && steps.status.outcome == 'failure'
+          && github.event_name == 'schedule'
+          && github.repository_owner == 'Ouranosinc'
+        uses: xarray-contrib/issue-from-pytest-log@f94477e45ef40e4403d7585ba639a9a3bcc53d43 # v1.3.0
+        with:
+          issue-title: "⚠️ Nightly upstream-dev CI failed for Python${{ matrix.python-version }} ⚠️"
+          log-path: output-${{ matrix.python-version }}-log.jsonl
+      - name: Tests measurement
+        uses: green-coding-solutions/eco-ci-energy-estimation@e79d33b08b0c47de4438c161d432730fce23f246 # v4.2.0
+        with:
+          task: get-measurement
+          label: 'Testing and Reporting (Upstream, Python${{ matrix.python-version }})'
+        continue-on-error: true
+      - name: Show Energy Results
+        uses: green-coding-solutions/eco-ci-energy-estimation@e79d33b08b0c47de4438c161d432730fce23f246 # v4.2.0
+        with:
+          task: display-results
+        continue-on-error: true
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 17cdbd5..4f6a59b 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -16,6 +16,7 @@ Changes
     * Now using advanced CodeQL configuration.
     * New pre-commit hooks for `vulture` (find dead code), `codespell` (grammatical errors), `zizmor` (workflow security), and `gitleaks` (token commit prevention).
     * Corrected some minor spelling and security issues.
+* Added `upstream` testing to the CI pipeline for both daily and push events. (:pull:`61`).
 
 Fixes
 ^^^^^
@@ -36,7 +37,7 @@ Changes
 * Split `sdba` from `xclim` into its own standalone package. Where needed, some common functionalities were duplicated: (:pull:`8`)
     * ``xsdba.units`` is an adaptation of the ``xclim.core.units`` modules.
     * Many functions and definitions found in ``xclim.core.calendar`` have been adapted to ``xsdba.base``.
-* Dependencies have been updated to reflect the new package structure. (:pull:`45`)
+* Dependencies have been updated to reflect the new package structure. (:pull:`45`).
 * Updated documentation configuration: (:pull:`46`)
     * Significant improvements to the documentation content and layout.
     * Now using the `furo` theme for `sphinx`.
diff --git a/CI/requirements_upstream.txt b/CI/requirements_upstream.txt
new file mode 100644
index 0000000..06f6780
--- /dev/null
+++ b/CI/requirements_upstream.txt
@@ -0,0 +1,2 @@
+xarray @ git+https://github.com/pydata/xarray.git@main
+xclim @ git+https://github.com/Ouranosinc/xclim.git@main
diff --git a/tox.ini b/tox.ini
index aa91405..638c870 100644
--- a/tox.ini
+++ b/tox.ini
@@ -53,6 +53,7 @@ download = True
 install_command = python -m pip install --no-user {opts} {packages}
 deps =
     coveralls: coveralls>=4.0.1
+    upstream: -r {toxinidir}/CI/requirements_upstream.txt
 commands_pre =
     pip list
     pip check