diff --git a/docs/source/changelog.rst b/docs/source/changelog.rst
index 6eb15fc..79fcddb 100644
--- a/docs/source/changelog.rst
+++ b/docs/source/changelog.rst
@@ -1,6 +1,15 @@
 Changelog
 ---------
 
+PyHamtools 0.7.9
+================
+
+16. December 2021
+
+* Calculating sunrise and sunset close to the artic region raised a ValueError due
+  to a bug in the underlying 3rd party libary ephem. This release upgrades the 
+  dependency to ephem > 4.1.3 which has the bug already fixed.
+
 PyHamTools 0.7.8
 ================
 
diff --git a/pyhamtools/version.py b/pyhamtools/version.py
index e9c73fb..51328ec 100644
--- a/pyhamtools/version.py
+++ b/pyhamtools/version.py
@@ -1,3 +1,3 @@
-VERSION = (0, 7, 8)
+VERSION = (0, 7, 9)
 __release__ = ''.join(['-.'[type(x) == int]+str(x) for x in VERSION])[1:]
 __version__ = '.'.join((str(VERSION[0]), str(VERSION[1])))
diff --git a/setup.py b/setup.py
index 02ffdcd..045c9e9 100755
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@ setup(name='pyhamtools',
       install_requires=[
           "pytz>=2019.1",
           "requests>=2.21.0",
-          "pyephem>=3.7.6.0",
+          "ephem>=4.1.3",
           "beautifulsoup4>=4.7.1",
           "future>=0.17.1",
           "redis>=2.10.6",
diff --git a/test/test_locator_sunrise_sunset.py b/test/test_locator_sunrise_sunset.py
index 79f02a4..a11b6b8 100644
--- a/test/test_locator_sunrise_sunset.py
+++ b/test/test_locator_sunrise_sunset.py
@@ -25,17 +25,30 @@ class Test_calculate_sunrise_sunset_normal_case():
         assert calculate_sunrise_sunset(locator, test_time)['sunset'] - result_JN48QM_1_1_2014_sunset < time_margin
         assert calculate_sunrise_sunset(locator, test_time)['sunrise'] - result_JN48QM_1_1_2014_sunrise < time_margin
 
-    def test_calculate_distance_edge_case(self):
+
+    def test_calculate_sunrise_sunset_with_sun_never_rising(self):
+
+        time_margin = timedelta(minutes=1)
+        locator = "IQ50PW"
+        # The sun never rises in winter time close to the north pole (e.g. at Jan Mayen)
+        # Therefore we expect no sunrise or sunset. 
+
+        test_time =  datetime(year=2021, month=12, day=15, tzinfo=UTC)
+
+        assert calculate_sunrise_sunset(locator, test_time)['morning_dawn'] == None
+        assert calculate_sunrise_sunset(locator, test_time)['evening_dawn'] == None
+        assert calculate_sunrise_sunset(locator, test_time)['sunset'] == None
+        assert calculate_sunrise_sunset(locator, test_time)['sunrise'] == None
+
+
+    def test_calculate_sunrise_sunset_with_sun_never_setting(self):
 
         time_margin = timedelta(minutes=1)
         locator = "AA00AA"
-        # no sunrise or sunset at southpol during arctic summer
+        # The sun never sets at the south pole during arctic summer 
+        # Therefore we expect no sunrise or sunset. 
 
         test_time =  datetime(year=2014, month=1, day=1, tzinfo=UTC)
-        result_AA00AA_1_1_2014_evening_dawn = datetime(2014, 1, 1, 15, 38, tzinfo=UTC)
-        result_AA00AA_1_1_2014_morning_dawn = datetime(2014, 1, 1, 6, 36,  tzinfo=UTC)
-        result_AA00AA_1_1_2014_sunrise = datetime(2014, 1, 1, 7, 14, tzinfo=UTC)
-        result_AA00AA_1_1_2014_sunset = datetime(2014, 1, 1, 16, 15, 23, 31016, tzinfo=UTC)
 
         assert calculate_sunrise_sunset(locator, test_time)['morning_dawn'] == None
         assert calculate_sunrise_sunset(locator, test_time)['evening_dawn'] == None