diff --git a/CHANGES.rst b/CHANGES.rst
index 5dced05cd..988261b4b 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,15 @@
 Release Notes
 =============
 
+1.1.15
+------
+
+* Fix #309 by deduplicating output of the distribution finder. (#310)
+  `#310 <https://github.com/pantsbuild/pex/pull/310>`_
+
+* Update wheel dependency to >0.26.0. (#304)
+  `#304 <https://github.com/pantsbuild/pex/pull/304>`_
+
 1.1.14
 ------
 
diff --git a/README.rst b/README.rst
index 0e18feae9..c7bc62eff 100644
--- a/README.rst
+++ b/README.rst
@@ -12,7 +12,7 @@ include multiple platform-specific Python distributions, meaning that a single p
 can be portable across Linux and OS X.
 
 pex files can be built using the ``pex`` tool.  Build systems such as `Pants
-<http://pantsbuild.github.io/>`_ and `Buck <http://facebook.github.io/buck/>`_ also
+<http://pantsbuild.github.io/>`_, `Buck <http://facebook.github.io/buck/>`_, and  `{py}gradle <https://github.com/linkedin/pygradle>`_  also
 support building .pex files directly.
 
 Still unsure about what pex does or how it works?  Watch this quick lightning
diff --git a/pex/environment.py b/pex/environment.py
index 162ab8eb6..b8e920108 100644
--- a/pex/environment.py
+++ b/pex/environment.py
@@ -82,17 +82,20 @@ def write_zipped_internal_cache(cls, pex, pex_info):
           distribution_name, dist_digest))
         if os.path.exists(cached_location):
           dist = DistributionHelper.distribution_from_path(cached_location)
-          existing_cached_distributions.append(dist)
-          continue
+          if dist is not None:
+            existing_cached_distributions.append(dist)
+            continue
         else:
           dist = DistributionHelper.distribution_from_path(os.path.join(pex, internal_dist_path))
-          if DistributionHelper.zipsafe(dist) and not pex_info.always_write_cache:
-            zip_safe_distributions.append(dist)
-            continue
+          if dist is not None:
+            if DistributionHelper.zipsafe(dist) and not pex_info.always_write_cache:
+              zip_safe_distributions.append(dist)
+              continue
 
         with TRACER.timed('Caching %s' % dist):
           newly_cached_distributions.append(
             CacheHelper.cache_distribution(zf, internal_dist_path, cached_location))
+
     return existing_cached_distributions, newly_cached_distributions, zip_safe_distributions
 
   @classmethod
diff --git a/pex/util.py b/pex/util.py
index f2fb11350..ad1b4b4e6 100644
--- a/pex/util.py
+++ b/pex/util.py
@@ -89,9 +89,9 @@ def distribution_from_path(cls, path, name=None):
     # Monkeypatch pkg_resources finders should it not already be so.
     register_finders()
     if name is None:
-      distributions = list(find_distributions(path))
+      distributions = set(find_distributions(path))
       if len(distributions) == 1:
-        return distributions[0]
+        return distributions.pop()
     else:
       for dist in find_distributions(path):
         if dist.project_name == name:
diff --git a/pex/version.py b/pex/version.py
index 38d589a21..e3ded9f2e 100644
--- a/pex/version.py
+++ b/pex/version.py
@@ -1,7 +1,7 @@
 # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-__version__ = '1.1.14'
+__version__ = '1.1.15'
 
 SETUPTOOLS_REQUIREMENT = 'setuptools>=2.2,<20.11'
-WHEEL_REQUIREMENT = 'wheel>=0.24.0,<0.30.0'
+WHEEL_REQUIREMENT = 'wheel>=0.26.0,<0.30.0'