diff --git a/debian/changelog b/debian/changelog
index 980f1b8..ed2cfe0 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -19,6 +19,7 @@ ubuntu-dev-tools (0.133) unstable; urgency=low
     of distro-info.
   * syncpackge: Gracefully deal with no available changelog from Debian (PTS
     changelogs aren't available immediately)
+  * syncpackage, requestsync: Sync from testing for LTSs (LP: #876400)
 
   [ Benjamin Drung ]
   * syncpackage: Allow syncing to -proposed with --no-lp.
diff --git a/debian/control b/debian/control
index 049fa46..bb91a4c 100644
--- a/debian/control
+++ b/debian/control
@@ -16,7 +16,7 @@ Build-Depends: dctrl-tools,
                python-all (>= 2.6.5-13~),
                python-apt (>= 0.7.93~),
                python-debian (>= 0.1.20~),
-               python-distro-info | distro-info (<< 0.3~),
+               python-distro-info (>= 0.4~),
                python-gnupginterface,
                python-launchpadlib (>= 1.5.7),
                python-mox,
@@ -38,7 +38,7 @@ Depends: binutils,
          lsb-release,
          python-apt (>= 0.7.93~),
          python-debian (>= 0.1.20~),
-         python-distro-info | distro-info (<< 0.3~),
+         python-distro-info (>= 0.4~),
          python-launchpadlib (>= 1.5.7),
          python-lazr.restfulclient,
          sudo,
diff --git a/doc/requestsync.1 b/doc/requestsync.1
index ee3e3b6..f47ef70 100644
--- a/doc/requestsync.1
+++ b/doc/requestsync.1
@@ -48,7 +48,7 @@ Display a help message and exit.
 .TP
 .B \-d
 Specifies which Debian distribution a package should be synced from.
-Default is \fIunstable\fR.
+Default is \fItesting\fR in LTS cycles, otherwise \fIunstable\fR.
 .TP
 .B \-n
 Specifies that the package is a new package, and requestsync should not
diff --git a/doc/syncpackage.1 b/doc/syncpackage.1
index 0a7bad3..a28299f 100644
--- a/doc/syncpackage.1
+++ b/doc/syncpackage.1
@@ -30,10 +30,11 @@ archive.
 Show help message and exit
 .TP
 \fB\-d\fI DIST\fR, \fB\-\-distribution\fR=\fIDIST\fR
-Debian distribution to sync from.
+Debian distribution to sync from. Default is \fItesting\fR during LTS
+cycles, and \fIunstable\fR otherwise.
 .TP
 \fB\-r\fI RELEASE\fR, \fB\-\-release\fR=\fIRELEASE\fR
-Specify target Ubuntu release.
+Specify target Ubuntu release. Default: current development release.
 .TP
 \fB\-V\fI DEBVERSION\fR, \fB\-\-debian\-version\fR=\fIDEBVERSION\fR
 Specify the version to sync from.
diff --git a/requestsync b/requestsync
index 7500009..752998f 100755
--- a/requestsync
+++ b/requestsync
@@ -44,13 +44,18 @@ from ubuntutools.requestsync.common import (edit_report, get_debian_changelog,
 #
 
 def main():
+    ubu_info = UbuntuDistroInfo()
+    DEFAULT_SOURCE = 'unstable'
+    if ubu_info.is_lts(ubu_info.devel()):
+        DEFAULT_SOURCE = 'testing'
+
     # Our usage options.
     usage = ('Usage: %prog [options] '
              '<source package> [<target release> [base version]]')
     parser = OptionParser(usage)
 
     parser.add_option('-d', type='string',
-                      dest='dist', default='unstable',
+                      dest='dist', default=DEFAULT_SOURCE,
                       help='Debian distribution to sync from.')
     parser.add_option('-k', type='string',
                       dest='keyid', default=None,
@@ -174,7 +179,7 @@ def main():
         if lpapi:
             release = Distribution('ubuntu').getDevelopmentSeries().name
         else:
-            release = UbuntuDistroInfo().devel()
+            release = ubu_info.devel()
         print >> sys.stderr, 'W: Target release missing - assuming %s' % release
     elif len(args) == 2:
         release = args[1]
diff --git a/syncpackage b/syncpackage
index 57c4c00..1a43d9d 100755
--- a/syncpackage
+++ b/syncpackage
@@ -31,6 +31,7 @@ import urllib
 
 import debian.debian_support
 from devscripts.logger import Logger
+from distro_info import UbuntuDistroInfo
 from lazr.restfulclient.errors import HTTPError
 
 from ubuntutools.archive import (DebianSourcePackage, UbuntuSourcePackage,
@@ -271,7 +272,8 @@ def fetch_source_pkg(package, dist, version, component, ubuntu_release, mirror):
         return DebianSourcePackage(dscfile=package, mirrors=mirrors)
 
     if dist is None:
-        dist = "unstable"
+        ubu_info = UbuntuDistroInfo()
+        dist = 'testing' if ubu_info.is_lts(ubu_info.devel()) else 'unstable'
     requested_version = version
     if type(version) == str:
         version = Version(version)