diff --git a/debian/patches/fix_cms_verify_when_input_files_not_exists.patch b/debian/patches/fix_cms_verify_when_input_files_not_exists.patch
deleted file mode 100644
index 180fc66507f2100e5ee6121c1e8b6806256de462..0000000000000000000000000000000000000000
--- a/debian/patches/fix_cms_verify_when_input_files_not_exists.patch
+++ /dev/null
@@ -1,56 +0,0 @@
-Description: Workaround for FTBFS with OpenSSL >= 1.1.0
- OpenSSL1.1 returns exit code 1 if certfile or CAfile not exists.
- This is possibly OpenSSL bug
- https://www.openssl.org/docs/man1.1.0/apps/cms.html#EXIT-CODES
-Author: Ondřej Kobližek <koblizeko@gmail.com>
-Forwarded: https://bugs.launchpad.net/python-keystoneclient/+bug/1646858
-
---- a/keystoneclient/common/cms.py
-+++ b/keystoneclient/common/cms.py
-@@ -42,9 +42,10 @@
- 
- 
- # The openssl cms command exits with these status codes.
--# See https://www.openssl.org/docs/apps/cms.html#EXIT_CODES
-+# See https://www.openssl.org/docs/man1.1.0/apps/cms.html#EXIT-CODES
- class OpensslCmsExitStatus(object):
-     SUCCESS = 0
-+    COMMAND_OPTIONS_PARSING_ERROR = 1
-     INPUT_FILE_READ_ERROR = 2
-     CREATE_CMS_READ_MIME_ERROR = 3
- 
-@@ -180,21 +181,31 @@
-     # Do not log errors, as some happen in the positive thread
-     # instead, catch them in the calling code and log them there.
- 
--    # When invoke the openssl with not exist file, return code 2
--    # and error msg will be returned.
-+    # When invoke the openssl >= 1.1.0 with not exist file, return code should
-+    # be 2 instead of 1 and error msg will be returned.
-     # You can get more from
--    # http://www.openssl.org/docs/apps/cms.html#EXIT_CODES
-+    # https://www.openssl.org/docs/man1.1.0/apps/cms.html#EXIT-CODES
-     #
-     # $ openssl cms -verify -certfile not_exist_file -CAfile
-     #       not_exist_file -inform PEM -nosmimecap -nodetach
-     #       -nocerts -noattr
-+    # openssl < 1.1.0 returns
-     # Error opening certificate file not_exist_file
-+    # openssl >= 1.1.0 returns
-+    # cms: Cannot open input file not_exist_file, No such file or directory
-     #
-     if retcode == OpensslCmsExitStatus.INPUT_FILE_READ_ERROR:
-         if err.startswith('Error reading S/MIME message'):
-             raise exceptions.CMSError(err)
-         else:
-             raise exceptions.CertificateConfigError(err)
-+    # workaround for OpenSSL >= 1.1.0,
-+    # should return OpensslCmsExitStatus.INPUT_FILE_READ_ERROR
-+    elif retcode == OpensslCmsExitStatus.COMMAND_OPTIONS_PARSING_ERROR:
-+        if err.startswith('cms: Cannot open input file'):
-+            raise exceptions.CertificateConfigError(err)
-+        else:
-+            raise subprocess.CalledProcessError(retcode, 'openssl', output=err)
-     elif retcode != OpensslCmsExitStatus.SUCCESS:
-         raise subprocess.CalledProcessError(retcode, 'openssl', output=err)
-     return output
diff --git a/debian/patches/series b/debian/patches/series
index 5f2320de80ab522a03343813ec969ed493cc2958..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1 +0,0 @@
-fix_cms_verify_when_input_files_not_exists.patch