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diff --git a/src/third_party/wiredtiger/test/suite/test_util19.py b/src/third_party/wiredtiger/test/suite/test_util19.py
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+#!/usr/bin/env python
+#
+# Public Domain 2014-2021 MongoDB, Inc.
+# Public Domain 2008-2014 WiredTiger, Inc.
+#
+# This is free and unencumbered software released into the public domain.
+#
+# Anyone is free to copy, modify, publish, use, compile, sell, or
+# distribute this software, either in source code form or as a compiled
+# binary, for any purpose, commercial or non-commercial, and by any
+# means.
+#
+# In jurisdictions that recognize copyright laws, the author or authors
+# of this software dedicate any and all copyright interest in the
+# software to the public domain. We make this dedication for the benefit
+# of the public at large and to the detriment of our heirs and
+# successors. We intend this dedication to be an overt act of
+# relinquishment in perpetuity of all present and future rights to this
+# software under copyright law.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+
+from suite_subprocess import suite_subprocess
+import wiredtiger, wttest
+from wtscenario import make_scenarios
+
+# test_util19.py
+#   Utilities: wt downgrade
+class test_util19(wttest.WiredTigerTestCase, suite_subprocess):
+    tablename = 'test_util19.a'
+    uri = 'table:' + tablename
+    entries = 100
+    log_max = "100K"
+    log_latest_compat = 5
+
+    create_release = [
+        ('def', dict(create_rel='none')),
+        ('100', dict(create_rel="10.0")),
+        ('33', dict(create_rel="3.3")),
+        ('32', dict(create_rel="3.2")),
+        ('31', dict(create_rel="3.1")),
+        ('30', dict(create_rel="3.0")),
+        ('26', dict(create_rel="2.6")),
+    ]
+
+    downgrade_release = [
+        ('100_rel', dict(downgrade_rel="10.0", log_downgrade_compat=5)),
+        ('33_rel', dict(downgrade_rel="3.3", log_downgrade_compat=4)),
+        ('32_rel', dict(downgrade_rel="3.2", log_downgrade_compat=3)),
+        ('31_rel', dict(downgrade_rel="3.1", log_downgrade_compat=3)),
+        ('30_rel', dict(downgrade_rel="3.0", log_downgrade_compat=2)),
+        ('26_rel', dict(downgrade_rel="2.6", log_downgrade_compat=1)),
+    ]
+
+    scenarios = make_scenarios(create_release, downgrade_release)
+
+    def conn_config(self):
+        conf_str = 'log=(archive=false,enabled,file_max=%s),' % self.log_max
+        if (self.create_rel != 'none'):
+            conf_str += 'compatibility=(release="%s"),' % (self.create_rel)
+        return conf_str
+
+    def test_downgrade(self):
+        """
+        Run wt downgrade on our created database and test its new compatibility version.
+        """
+        # Create the initial database at the compatibility level established by
+        # the connection config ('create_rel').
+        self.session.create(self.uri, 'key_format=S,value_format=S')
+        c = self.session.open_cursor(self.uri, None)
+        # Populate the table to generate some log files.
+        for i in range(self.entries):
+            key = 'KEY' + str(i)
+            val = 'VAL' + str(i)
+            c[key] = val
+        c.close()
+
+        # Call the downgrade utility to reconfigure our database with the specified compatibility version.
+        wt_config = 'log=(archive=false,enabled,file_max=%s),verbose=[log]' % self.log_max
+        downgrade_opt = '-V %s' % self.downgrade_rel
+        self.runWt(['-C', wt_config , 'downgrade', downgrade_opt], reopensession=False, outfilename='downgrade.out')
+        # Based on the downgrade version we can test if the corresponding log compatibility version
+        # has been set.
+        compat_str = '/WT_CONNECTION\.reconfigure: .*: COMPATIBILITY: Version now %d/' % self.log_downgrade_compat
+        if self.log_downgrade_compat != self.log_latest_compat:
+            self.check_file_contains('downgrade.out', compat_str)
+        else:
+            self.check_file_not_contains('downgrade.out', compat_str)
+
+if __name__ == '__main__':
+    wttest.run()