diff --git a/ocrd_calamari/ocrd-tool.json b/ocrd_calamari/ocrd-tool.json
index 691eeba..467cdec 100644
--- a/ocrd_calamari/ocrd-tool.json
+++ b/ocrd_calamari/ocrd-tool.json
@@ -20,7 +20,7 @@
       "parameters": {
         "checkpoint_dir": {
           "description": "The directory containing calamari model files (*.ckpt.json). Uses all checkpoints in that directory",
-          "type": "string", "format": "file", "cacheable": true
+          "type": "string", "format": "file", "cacheable": true, "default": "qurator-gt4histocr-1.0"
         },
         "checkpoint": {
           "description": "The calamari model files (*.ckpt.json)",
diff --git a/ocrd_calamari/recognize.py b/ocrd_calamari/recognize.py
index f5237fc..a0eca4c 100644
--- a/ocrd_calamari/recognize.py
+++ b/ocrd_calamari/recognize.py
@@ -42,8 +42,9 @@ class CalamariRecognize(Processor):
 
     def _init_calamari(self):
 
-        if self.parameter.get('checkpoint_dir', None):
-            self.parameter['checkpoint'] = '%s/*.ckpt.json' % self.parameter['checkpoint_dir']
+        if not self.parameter.get('checkpoint', None) and self.parameter.get('checkpoint_dir', None):
+            resolved = self.resolve_resource(self.parameter['checkpoint_dir'])
+            self.parameter['checkpoint'] = '%s/*.ckpt.json' % resolved
         checkpoints = glob(self.parameter['checkpoint'])
         self.predictor = MultiPredictor(checkpoints=checkpoints)
 
diff --git a/requirements.txt b/requirements.txt
index 20b2ff2..cbfb800 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,4 @@ tensorflow >= 2.3.0rc2
 calamari-ocr == 1.0.*
 setuptools >= 41.0.0  # tensorboard depends on this, but why do we get an error at runtime?
 click
-ocrd >= 2.13.0
+ocrd >= 2.22.0