diff --git a/pyobs/utils/pipeline/pipeline.py b/pyobs/utils/pipeline/pipeline.py
index cf722bce..2b63d414 100644
--- a/pyobs/utils/pipeline/pipeline.py
+++ b/pyobs/utils/pipeline/pipeline.py
@@ -162,7 +162,11 @@ async def calibrate(self, image: Image) -> Image:
         calibrated = image.copy()
 
         # run pipeline
-        return await self.run_pipeline(calibrated)
+        image = await self.run_pipeline(calibrated)
+
+        # set reduction level and return
+        image.header["RLEVEL"] = (1, "Reduction level")
+        return image
 
     @staticmethod
     async def find_master(
diff --git a/pyproject.toml b/pyproject.toml
index 403ee8e0..d201d8f2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [tool.poetry]
 name = "pyobs-core"
 packages = [{ include = "pyobs" }]
-version = "1.6.4"
+version = "1.6.5"
 description = "robotic telescope software"
 authors = ["Tim-Oliver Husser <thusser@uni-goettingen.de>"]
 license = "MIT"