diff --git a/pkgs/development/interpreters/python/2.7/default.nix b/pkgs/development/interpreters/python/2.7/default.nix
index db9135ea2ab..aca88f504a0 100644
--- a/pkgs/development/interpreters/python/2.7/default.nix
+++ b/pkgs/development/interpreters/python/2.7/default.nix
@@ -23,11 +23,11 @@ with stdenv.lib;
 
 let
   majorVersion = "2.7";
-  version = "${majorVersion}.11";
+  version = "${majorVersion}.12";
 
   src = fetchurl {
     url = "http://www.python.org/ftp/python/${version}/Python-${version}.tar.xz";
-    sha256 = "0iiz844riiznsyhhyy962710pz228gmhv8qi3yk4w4jhmx2lqawn";
+    sha256 = "0y7rl603vmwlxm6ilkhc51rx2mfj14ckcz40xxgs0ljnvlhp30yp";
   };
 
   patches =
diff --git a/pkgs/development/interpreters/python/2.7/no-ldconfig.patch b/pkgs/development/interpreters/python/2.7/no-ldconfig.patch
index 10284c7b374..44c38fb2953 100644
--- a/pkgs/development/interpreters/python/2.7/no-ldconfig.patch
+++ b/pkgs/development/interpreters/python/2.7/no-ldconfig.patch
@@ -1,7 +1,8 @@
-diff -ru -x '*~' Python-2.7.11-orig/Lib/ctypes/util.py Python-2.7.11/Lib/ctypes/util.py
---- Python-2.7.11-orig/Lib/ctypes/util.py	2015-12-05 20:46:56.000000000 +0100
-+++ Python-2.7.11/Lib/ctypes/util.py	2016-07-01 14:24:50.714223450 +0200
-@@ -212,31 +212,7 @@
+diff --git a/Lib/ctypes/util.py b/Lib/ctypes/util.py
+index b2c514d..a6eca81 100644
+--- a/Lib/ctypes/util.py
++++ b/Lib/ctypes/util.py
+@@ -207,31 +207,7 @@ elif os.name == "posix":
      else:
  
          def _findSoname_ldconfig(name):
@@ -21,7 +22,7 @@ diff -ru -x '*~' Python-2.7.11-orig/Lib/ctypes/util.py Python-2.7.11/Lib/ctypes/
 -
 -            # XXX assuming GLIBC's ldconfig (with option -p)
 -            expr = r'\s+(lib%s\.[^\s]+)\s+\(%s' % (re.escape(name), abi_type)
--            f = os.popen('/sbin/ldconfig -p 2>/dev/null')
+-            f = os.popen('LC_ALL=C LANG=C /sbin/ldconfig -p 2>/dev/null')
 -            try:
 -                data = f.read()
 -            finally:
@@ -34,10 +35,11 @@ diff -ru -x '*~' Python-2.7.11-orig/Lib/ctypes/util.py Python-2.7.11/Lib/ctypes/
  
          def find_library(name):
              return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(name))
-diff -ru -x '*~' Python-2.7.11-orig/Lib/uuid.py Python-2.7.11/Lib/uuid.py
---- Python-2.7.11-orig/Lib/uuid.py	2015-12-05 20:47:09.000000000 +0100
-+++ Python-2.7.11/Lib/uuid.py	2016-07-01 14:33:14.360446897 +0200
-@@ -437,57 +437,7 @@
+diff --git a/Lib/uuid.py b/Lib/uuid.py
+index 7432032..9829d18 100644
+--- a/Lib/uuid.py
++++ b/Lib/uuid.py
+@@ -437,57 +437,7 @@ def _netbios_getnode():
          return ((bytes[0]<<40L) + (bytes[1]<<32L) + (bytes[2]<<24L) +
                  (bytes[3]<<16L) + (bytes[4]<<8L) + bytes[5])