diff -Naur a/src/gevent/libev/corecext.pyx b/src/gevent/libev/corecext.pyx
--- a/src/gevent/libev/corecext.pyx	2024-01-08 18:43:23.779192292 +0600
+++ b/src/gevent/libev/corecext.pyx	2024-01-08 18:44:29.900273131 +0600
@@ -111,7 +111,6 @@
 BACKEND_KQUEUE = libev.EVBACKEND_KQUEUE
 BACKEND_DEVPOLL = libev.EVBACKEND_DEVPOLL
 BACKEND_PORT = libev.EVBACKEND_PORT
-BACKEND_IOURING = libev.EVBACKEND_IOURING
 
 
 FORKCHECK = libev.EVFLAG_FORKCHECK
@@ -145,7 +144,6 @@
     # IOCP
     (libev.EVBACKEND_PORT, 'port'),
     (libev.EVBACKEND_KQUEUE, 'kqueue'),
-    (libev.EVBACKEND_IOURING, 'linux_iouring'),
     (libev.EVBACKEND_EPOLL, 'epoll'),
     (libev.EVBACKEND_POLL, 'poll'),
     (libev.EVBACKEND_SELECT, 'select'),
diff -Naur a/src/gevent/libev/_corecffi_cdef.c b/src/gevent/libev/_corecffi_cdef.c
--- a/src/gevent/libev/_corecffi_cdef.c	2024-01-08 18:43:23.779192292 +0600
+++ b/src/gevent/libev/_corecffi_cdef.c	2024-01-08 18:44:13.172383178 +0600
@@ -43,7 +43,6 @@
 #define EVBACKEND_KQUEUE ...
 #define EVBACKEND_DEVPOLL ...
 #define EVBACKEND_PORT ...
-#define EVBACKEND_IOURING ...
 /* #define EVBACKEND_IOCP ... */
 
 #define EVBACKEND_ALL ...
diff -Naur a/src/gevent/libev/corecffi.py b/src/gevent/libev/corecffi.py
--- a/src/gevent/libev/corecffi.py	2024-01-08 18:43:23.780192285 +0600
+++ b/src/gevent/libev/corecffi.py	2024-01-08 18:44:36.804227712 +0600
@@ -136,7 +136,6 @@
     # IOCP --- not supported/used.
     (libev.EVBACKEND_PORT, 'port'),
     (libev.EVBACKEND_KQUEUE, 'kqueue'),
-    (libev.EVBACKEND_IOURING, 'linux_iouring'),
     (libev.EVBACKEND_EPOLL, 'epoll'),
     (libev.EVBACKEND_POLL, 'poll'),
     (libev.EVBACKEND_SELECT, 'select'),
diff -Naur a/src/gevent/libev/libev.pxd b/src/gevent/libev/libev.pxd
--- a/src/gevent/libev/libev.pxd	2024-01-08 18:43:23.780192285 +0600
+++ b/src/gevent/libev/libev.pxd	2024-01-08 18:45:17.547959672 +0600
@@ -74,7 +74,6 @@
     int EVBACKEND_DEVPOLL
     int EVBACKEND_PORT
     int EVBACKEND_IOCP
-    int EVBACKEND_IOURING
     int EVBACKEND_ALL
     int EVBACKEND_MASK
 
diff -Naur a/src/gevent/tests/test__close_backend_fd.py b/src/gevent/tests/test__close_backend_fd.py
--- a/src/gevent/tests/test__close_backend_fd.py	2024-01-08 18:43:23.780192285 +0600
+++ b/src/gevent/tests/test__close_backend_fd.py	2024-01-08 18:45:01.020068404 +0600
@@ -27,7 +27,6 @@
     BACKENDS_THAT_SUCCEED_WHEN_FD_CLOSED = (
         'kqueue',
         'epoll',
-        'linux_iouring',
     )
 
     BACKENDS_THAT_WILL_FAIL_TO_CREATE_AT_RUNTIME = (
