diff --git a/cinder/volume/drivers/prophetstor/dplcommon.py b/cinder/volume/drivers/prophetstor/dplcommon.py
index ec7ed75f94f..3192749c8a8 100644
--- a/cinder/volume/drivers/prophetstor/dplcommon.py
+++ b/cinder/volume/drivers/prophetstor/dplcommon.py
@@ -668,6 +668,9 @@ class DPLCOMMONDriver(driver.CloneableImageVD,
     # ThirdPartySystems wiki page
     CI_WIKI_NAME = "ProphetStor_CI"
 
+    # TODO(jsbryant) Remove driver in the 'U' release if CI is not fixed.
+    SUPPORTED = False
+
     def __init__(self, *args, **kwargs):
         cert_path = None
         cert_verify = False
diff --git a/doc/source/reference/support-matrix.ini b/doc/source/reference/support-matrix.ini
index 96bbd837944..f6648b54947 100644
--- a/doc/source/reference/support-matrix.ini
+++ b/doc/source/reference/support-matrix.ini
@@ -248,7 +248,7 @@ driver.nexenta=complete
 driver.nfs=complete
 driver.nimble=complete
 driver.oracle_zfssa=complete
-driver.prophetstor=complete
+driver.prophetstor=missing
 driver.pure=complete
 driver.qnap=complete
 driver.quobyte=complete
diff --git a/releasenotes/notes/unsupport-prophetstor-bfbc674fd86303db.yaml b/releasenotes/notes/unsupport-prophetstor-bfbc674fd86303db.yaml
new file mode 100644
index 00000000000..8aa6dac0136
--- /dev/null
+++ b/releasenotes/notes/unsupport-prophetstor-bfbc674fd86303db.yaml
@@ -0,0 +1,14 @@
+---
+upgrade:
+  - |
+    The Prophetstor driver has been marked as unsupported and is now
+    deprecated. ``enable_unsupported_driver`` will need to be set
+    to ``True`` in the driver's section in cinder.conf to continue
+    to use it.
+deprecations:
+  - |
+    The Prophetstor driver has been marked as unsupported and is now
+    deprecated. ``enable_unsupported_driver`` will need to be set
+    to ``True`` in the driver's section in cinder.conf to continue
+    to use it. If its support status does not change, it will be
+    removed in the 'U' development cycle.