diff --git a/.travis.yml b/.travis.yml
index 1d59fe78..092cae76 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ sudo: false
 #  - 3.6
 
 env:
-  - TEST_TARGET=unit PYTHON_TARGET=2.7
+#  - TEST_TARGET=unit PYTHON_TARGET=2.7
   - TEST_TARGET=unit PYTHON_TARGET=3.6
   - TEST_TARGET=unit PYTHON_TARGET=3.7
   # - TEST_TARGET=integration
diff --git a/cis/__init__.py b/cis/__init__.py
index 24b81cd3..627cf20d 100644
--- a/cis/__init__.py
+++ b/cis/__init__.py
@@ -17,7 +17,7 @@
 ungridded, but not a mix. For ungridded data lists it is assumed that all objects share the same coordinates.
 """
 __author__ = "David Michel, Daniel Wallis, Duncan Watson-Parris, Richard Wilkinson, Ian Bush, Matt Kendall, John Holt"
-__version__ = "1.7.1"
+__version__ = "1.7.2"
 __status__ = "Stable"
 __website__ = "http://www.cistools.net/"
 
diff --git a/cis/collocation/col_implementations.py b/cis/collocation/col_implementations.py
index 0220c5cf..2c614a0e 100644
--- a/cis/collocation/col_implementations.py
+++ b/cis/collocation/col_implementations.py
@@ -295,10 +295,10 @@ def __init__(self, h_sep=None, a_sep=None, p_sep=None, t_sep=None):
             self.checks.append(self.time_constraint)
 
     def time_constraint(self, points, ref_point):
-        return np.nonzero(np.abs(points.time - ref_point.time) < self.t_sep)[0]
+        return (np.abs(points.time - ref_point.time) < self.t_sep).to_numpy().nonzero()[0]
 
     def alt_constraint(self, points, ref_point):
-        return np.nonzero(np.abs(points.altitude - ref_point.altitude) < self.a_sep)[0]
+        return (np.abs(points.altitude - ref_point.altitude) < self.a_sep).to_numpy().nonzero()[0]
 
     def pressure_constraint(self, points, ref_point):
         greater_pressures = np.nonzero(((points.air_pressure.values / ref_point.air_pressure) < self.p_sep) &
diff --git a/cis/test/unit/test_io/test_ungridded_data.py b/cis/test/unit/test_io/test_ungridded_data.py
index 3206661e..add99de9 100644
--- a/cis/test/unit/test_io/test_ungridded_data.py
+++ b/cis/test/unit/test_io/test_ungridded_data.py
@@ -104,7 +104,7 @@ def test_GIVEN_ungridded_data_WHEN_call_as_data_frame_THEN_returns_valid_data_fr
 
         assert_that(df['rainfall_flux'][5] == 6)
         assert_that(df['latitude'][17] == 0)
-        assert_that(df['latitude'].ix[datetime(1984,8,31)][0] == 10)
+        assert_that(df.loc[datetime(1984,8,31), 'latitude'][0] == 10)
         assert_that(df['rainfall_flux'].median() == 25.5)
 
     @skip_pandas
diff --git a/doc/whats_new_1.7.rst b/doc/whats_new_1.7.rst
index c167156c..024ec4b0 100644
--- a/doc/whats_new_1.7.rst
+++ b/doc/whats_new_1.7.rst
@@ -31,3 +31,9 @@ CIS 1.7.1 fixes
 ===============
  * Fixed an issue where interpolation would unmask masked source arrays
  * Support for Pandas 0.24
+
+CIS 1.7.2 fixes
+===============
+ * We no-longer officially support Python 2.7. We won't yet explicitly remove Python 2.7 features but we no longer
+test against Python 2 and won't fix issues relating to it.
+ * Support for Pandas 1.1