diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dec3848..3ba76de 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,6 +19,7 @@ jobs:
       BASE_IMAGE: "${{ vars.DOCKER_ORG }}/geospaas:2.5.2-python${{ matrix.python_version }}"
       IMAGE_NAME: "${{ vars.DOCKER_ORG }}/geospaas_harvesting"
       METANORM_VERSION: '4.2.2'
+      PYTHESINT_VERSION: 1.7.0.dev0
       GEOSPAAS_DB_HOST: 'db'
       GEOSPAAS_DB_USER: 'test'
       GEOSPAAS_DB_PASSWORD: "${{ secrets.GEOSPAAS_DB_PASSWORD }}"
@@ -56,6 +57,7 @@ jobs:
           build-args: |
             BASE_IMAGE=${{ env.BASE_IMAGE }}
             METANORM_VERSION=${{ env.METANORM_VERSION }}
+            PYTHESINT_VERSION=${{ env.PYTHESINT_VERSION }}
           push: false
           load: true
           tags: 'harvesting_tests'
@@ -107,6 +109,7 @@ jobs:
           build-args: |
             BASE_IMAGE=${{ env.BASE_IMAGE }}
             METANORM_VERSION=${{ env.METANORM_VERSION }}
+            PYTHESINT_VERSION=${{ env.PYTHESINT_VERSION }}
           push: ${{ github.event_name == 'release' }}
           tags: |
             ${{ env.IMAGE_NAME }}:${{ github.ref_name }}-python${{ matrix.python_version }}
diff --git a/Dockerfile b/Dockerfile
index ac79c5c..cbd4c7b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 ARG BASE_IMAGE=nansencenter/geospaas:latest
 
-FROM ${BASE_IMAGE} as base
+FROM ${BASE_IMAGE} AS base
 
 ARG METANORM_VERSION
 RUN pip install --upgrade --no-cache-dir \
@@ -11,6 +11,9 @@ RUN pip install --upgrade --no-cache-dir \
     'requests_oauthlib==1.3.*' \
     'tblib'
 
+ARG PYTHESINT_VERSION=''
+RUN bash -c "[ -n '$PYTHESINT_VERSION' ] && pip install --upgrade 'pythesint==$PYTHESINT_VERSION' || true"
+
 FROM base
 
 COPY . /tmp/setup