diff --git a/tests/api/parsers/opendap/test_adcp.py b/tests/api/parsers/opendap/test_adcp.py
index 1feebd2..8d39f61 100644
--- a/tests/api/parsers/opendap/test_adcp.py
+++ b/tests/api/parsers/opendap/test_adcp.py
@@ -18,7 +18,7 @@ def adcp_response():
 
 @pytest.fixture
 def parsed_adcp():
-    ds = xarray.open_dataset(PARSED_FP, 'r')
+    ds = xarray.open_dataset(PARSED_FP)
     yield ds
 
 
diff --git a/tests/api/parsers/opendap/test_cwind.py b/tests/api/parsers/opendap/test_cwind.py
index 8ba8dd7..0887eeb 100644
--- a/tests/api/parsers/opendap/test_cwind.py
+++ b/tests/api/parsers/opendap/test_cwind.py
@@ -18,7 +18,7 @@ def cwind_response():
 
 @pytest.fixture
 def parsed_cwind():
-    ds = xarray.open_dataset(PARSED_FP, 'r')
+    ds = xarray.open_dataset(PARSED_FP)
     yield ds
 
 
diff --git a/tests/api/parsers/opendap/test_ocean.py b/tests/api/parsers/opendap/test_ocean.py
index 6165222..2029a41 100644
--- a/tests/api/parsers/opendap/test_ocean.py
+++ b/tests/api/parsers/opendap/test_ocean.py
@@ -18,7 +18,7 @@ def ocean_response():
 
 @pytest.fixture
 def parsed_ocean():
-    ds = xarray.open_dataset(PARSED_FP, 'r')
+    ds = xarray.open_dataset(PARSED_FP)
     yield ds
 
 
diff --git a/tests/api/parsers/opendap/test_pwind.py b/tests/api/parsers/opendap/test_pwind.py
index e0c0bf7..c690dbb 100644
--- a/tests/api/parsers/opendap/test_pwind.py
+++ b/tests/api/parsers/opendap/test_pwind.py
@@ -18,7 +18,7 @@ def pwind_response():
 
 @pytest.fixture
 def parsed_pwind():
-    ds = xarray.open_dataset(PARSED_FP, 'r')
+    ds = xarray.open_dataset(PARSED_FP)
     yield ds
 
 
diff --git a/tests/api/parsers/opendap/test_stdmet.py b/tests/api/parsers/opendap/test_stdmet.py
index 8da171b..915a8e9 100644
--- a/tests/api/parsers/opendap/test_stdmet.py
+++ b/tests/api/parsers/opendap/test_stdmet.py
@@ -18,7 +18,7 @@ def stdmet_response():
 
 @pytest.fixture
 def parsed_stdmet():
-    ds = xarray.open_dataset(PARSED_FP, 'r')
+    ds = xarray.open_dataset(PARSED_FP)
     yield ds
 
 
diff --git a/tests/api/parsers/opendap/test_swden.py b/tests/api/parsers/opendap/test_swden.py
index 25ab9a1..50708a1 100644
--- a/tests/api/parsers/opendap/test_swden.py
+++ b/tests/api/parsers/opendap/test_swden.py
@@ -18,7 +18,7 @@ def swden_response():
 
 @pytest.fixture
 def parsed_swden():
-    ds = xarray.open_dataset(PARSED_FP, 'r')
+    ds = xarray.open_dataset(PARSED_FP)
     yield ds
 
 
diff --git a/tests/api/parsers/opendap/test_wlevel.py b/tests/api/parsers/opendap/test_wlevel.py
index 51b47fb..3ec5479 100644
--- a/tests/api/parsers/opendap/test_wlevel.py
+++ b/tests/api/parsers/opendap/test_wlevel.py
@@ -19,7 +19,7 @@ def wlevel_response():
 
 @pytest.fixture
 def parsed_wlevel():
-    ds = xarray.open_dataset(PARSED_FP, 'r')
+    ds = xarray.open_dataset(PARSED_FP)
     yield ds