diff --git a/ci/environment-upstream-dev.yml b/ci/environment-upstream-dev.yml
index 5c3c754..4726044 100644
--- a/ci/environment-upstream-dev.yml
+++ b/ci/environment-upstream-dev.yml
@@ -13,6 +13,8 @@ dependencies:
   - pytest-xdist
   - tqdm
   - xarray
+  - pydap
+  - aiohttp
   - pip:
       - git+https://github.com/intake/intake.git
       - git+https://github.com/Unidata/siphon.git
diff --git a/ci/environment.yml b/ci/environment.yml
index c092cfc..a6a3fec 100644
--- a/ci/environment.yml
+++ b/ci/environment.yml
@@ -15,3 +15,5 @@ dependencies:
   - siphon
   - tqdm
   - xarray
+  - pydap
+  - aiohttp
diff --git a/intake_thredds/cat.py b/intake_thredds/cat.py
index 22f2a23..ffd89d1 100644
--- a/intake_thredds/cat.py
+++ b/intake_thredds/cat.py
@@ -39,8 +39,10 @@ def _load(self):
                 ds.name: LocalCatalogEntry(
                     ds.name,
                     'THREDDS data',
-                    'netcdf',
+                    # 'netcdf',
+                    'opendap',
                     True,
+                    # {'urlpath': ds.access_urls['HTTPServer'], 'chunks': None},
                     {'urlpath': ds.access_urls['OPENDAP'], 'chunks': None},
                     [],
                     [],
diff --git a/requirements.txt b/requirements.txt
index 61b3de8..7177bd1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 aiohttp>=3.7
 intake-xarray>=0.3
 intake>=0.6.0
+pydap
 siphon
diff --git a/tests/test_cat.py b/tests/test_cat.py
index 9c2fb38..9def691 100644
--- a/tests/test_cat.py
+++ b/tests/test_cat.py
@@ -1,4 +1,5 @@
 import intake
+import intake_xarray
 import pytest
 import xarray as xr
 
@@ -23,11 +24,11 @@ def test_init_catalog(thredds_cat_url):
 def test_entry(thredds_cat_url):
     cat = intake.open_thredds_cat(thredds_cat_url)
     entry = cat['err.mnmean.v3.nc']
-    assert isinstance(entry, intake.source.base.DataSource)
+    assert isinstance(entry, intake_xarray.opendap.OpenDapSource)
     d = entry.describe()
     assert d['name'] == 'err.mnmean.v3.nc'
     assert d['container'] == 'xarray'
-    assert d['plugin'] == ['netcdf']
+    assert d['plugin'] == ['opendap']
     assert (
         d['args']['urlpath']
         == 'https://psl.noaa.gov/thredds/dodsC/Datasets/noaa.ersst/err.mnmean.v3.nc'
diff --git a/tests/test_source.py b/tests/test_source.py
index 9ece1ed..fa39c79 100644
--- a/tests/test_source.py
+++ b/tests/test_source.py
@@ -14,14 +14,14 @@ def test_thredds_merge(thredds_cat_url):
         'ASCAT',
         'ASCAT_v1-0_soil-moisture_daily_0-05deg_2007-2011',
         '00000000',
-        '*.nc',
+        '*12.nc',  # to speed up only takes all december files
     ]
     cat = intake.open_thredds_merged(thredds_cat_url, paths)
     assert cat.urlpath == thredds_cat_url
     assert cat.path == paths
 
     ds = cat.to_dask()
-    assert dict(ds.dims) == {'lat': 681, 'lon': 841, 'time': 1826}
+    assert dict(ds.dims) == {'lat': 681, 'lon': 841, 'time': 155}
     d = cat.discover()
     assert set(d['metadata']['coords']) == set(('lat', 'lon', 'time'))
     assert set(d['metadata']['data_vars'].keys()) == set(