diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a5aa55d3dcd..c714522e019 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -99,7 +99,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ~/.cache/ctapipe
-          key: ctapipe-test-data
+          key: ctapipe-test-data-desy
 
       - name: Prepare mamba installation
         if: matrix.install-method == 'mamba' &&  contains(github.event.pull_request.labels.*.name, 'documentation-only') == false
diff --git a/docs/changes/2664.maintenance.rst b/docs/changes/2664.maintenance.rst
new file mode 100644
index 00000000000..cd41d1344b0
--- /dev/null
+++ b/docs/changes/2664.maintenance.rst
@@ -0,0 +1 @@
+Change data server for test datasets from in2p3 to DESY hosted server.
diff --git a/src/ctapipe/utils/datasets.py b/src/ctapipe/utils/datasets.py
index 03192668cc6..cb646f7b2d1 100644
--- a/src/ctapipe/utils/datasets.py
+++ b/src/ctapipe/utils/datasets.py
@@ -35,7 +35,7 @@
 
 
 #: default base URL for downloading datasets
-DEFAULT_URL = "http://cccta-dataserver.in2p3.fr/data/ctapipe-test-data/v1.1.0/"
+DEFAULT_URL = "https://minio-cta.zeuthen.desy.de/dpps-testdata-public/data/ctapipe-test-data/v1.1.0/"
 
 
 def get_default_url():