diff --git a/.gitattributes b/.gitattributes
index 5c8952ee5..f50450273 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,4 +1,3 @@
 *.nc filter=lfs diff=lfs merge=lfs -text
 *.nc4 filter=lfs diff=lfs merge=lfs -text
-test/Data/rossrad.dat filter=lfs diff=lfs merge=lfs -text
 *.pt filter=lfs diff=lfs merge=lfs -text
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 3b3c57ca4..13d4ea698 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -185,7 +185,7 @@ install(FILES ${soca_install_model_input}
         DESTINATION ${INSTALL_DATA_DIR}/testdata/72x35x25/INPUT/ )
 
 set( soca_install_data
-  Data/rossrad.dat
+  Data/rossrad.nc
   Data/godas_sst_bgerr.nc )
 install(FILES ${soca_install_data}
         DESTINATION ${INSTALL_DATA_DIR}/testdata/ )
diff --git a/tutorial/tutorial_tools.sh b/tutorial/tutorial_tools.sh
index 82c5d9a03..0308c9ec4 100644
--- a/tutorial/tutorial_tools.sh
+++ b/tutorial/tutorial_tools.sh
@@ -26,7 +26,7 @@ function mom6_soca_static() {
     cp $datadir/Data/72x35x25/MOM_input .
     ln -sf $datadir/Data/fields_metadata.yml .
     ln -sf $datadir/Data/72x35x25/*_table .
-    ln -sf $datadir/Data/rossrad.dat .
+    ln -sf $datadir/Data/rossrad.nc .
     ln -sf $datadir/Data/godas_sst_bgerr.nc .
 }