diff --git a/buildbot/masters/datatracker/master.cfg b/buildbot/masters/datatracker/master.cfg
index b1c6ca22c..46d515ba7 100644
--- a/buildbot/masters/datatracker/master.cfg
+++ b/buildbot/masters/datatracker/master.cfg
@@ -83,6 +83,7 @@ c['schedulers'] = [
         change_filter=filter.ChangeFilter(branch_re='personal/.*')),
     # Periodic Schedulers
     Nightly(name="lin_test_libs", hour=16, minute=42, branch="trunk",   builderNames=["Verify Latest Libs"],),
+    Nightly(name="lin_test_old_libs", hour=16, minute=42, branch="trunk",   builderNames=["Verify Minimum Libs"],),
     # Force schedulers
     ForceScheduler(name="Force PyFlakes",                               builderNames=["Check PyFlakes"]),
     ForceScheduler(name="Force Test Suite",                             builderNames=["Test Suite"]),
@@ -390,6 +391,64 @@ c['builders'].append(BuilderConfig(name="Test-Crawler", factory=factory, categor
         slavenames=["datatracker_lin_py27_1", ]))
 
 
+# -*- section Builder_Verify_Old_Libs -*-
+
+# This build runs pip install --upgrade, to make sure that we install the earliest version of
+# all dependencies, in order to get an indication if/when an incompatibility turns up with a new
+# version of a dependency.  The other test suite builders *don't* use --upgrade, in order to not
+# change the external test conditions and produce spurious errors because of version changes in
+# dependencies.
+
+factory = BuildFactory()
+factory.addStep(SVN(
+                username='buildbot@tools.ietf.org',
+                descriptionDone="svn update",
+                workdir=Interpolate('build/%(src::branch)s'),
+                haltOnFailure=True,
+                repourl=Interpolate('https://svn.tools.ietf.org/svn/tools/ietfdb/%(src::branch:~trunk)s'),
+                descriptionSuffix=[Interpolate('%(src::branch)s %(src::revision)s')],
+            ))
+factory.addStep(RemovePYCs(workdir=Interpolate('build/%(src::branch)s')))
+factory.addStep(ShellCommand(
+                descriptionDone="install/upgrade requirements",
+                workdir=Interpolate('build/%(src::branch)s'),
+                haltOnFailure=True,
+                command=["sed", "-i", "-e", "s/>=/==/", "requirements.txt"],
+            ))
+factory.addStep(ShellCommand(
+                descriptionDone="install/upgrade requirements",
+                workdir=Interpolate('build/%(src::branch)s'),
+                haltOnFailure=True,
+                command=["pip", "install", "--upgrade", "-r", "requirements.txt"],
+            ))
+factory.addStep(ShellCommand(
+                descriptionDone="seting up settings_local.py",
+                workdir=Interpolate('build/%(src::branch)s'),
+                haltOnFailure=True,
+                command=["cp", "/home/buildbot/settings_local.py", "./"],
+            ))
+factory.addStep(ShellCommand(
+                descriptionDone="list installed pyton modules",
+                workdir=Interpolate('build/%(src::branch)s'),
+                haltOnFailure=True,
+                command=["pip", "list"],
+            ))
+factory.addStep(ShellCommand(
+                descriptionDone="collect static files",
+                workdir=Interpolate('build/%(src::branch)s'),
+                haltOnFailure=False,
+                flunkOnFailure=False,
+                command=["ietf/manage.py", "collectstatic", "--noinput", ],
+            ))
+factory.addStep(UnitTest(
+                workdir=Interpolate('build/%(src::branch)s'),
+                haltOnFailure=True,
+                command=["ietf/manage.py", "test", "--settings=settings_sqlitetest", "--verbosity=2", ],
+            ))
+c['builders'].append(BuilderConfig(name="Verify Minimum Libs", factory=factory, category="1. trunk",
+        slavenames=["datatracker_lin_py27_5"]))
+
+
 # -*- section Builder_Dependencies -*-
 
 # This build runs pip install --upgrade, to make sure that we install the latest version of all