diff --git a/pkgs/applications/science/math/sage/patches/docutils-0.18.1-deprecation.patch b/pkgs/applications/science/math/sage/patches/docutils-0.18.1-deprecation.patch
deleted file mode 100644
index 0a19e7af1048..000000000000
--- a/pkgs/applications/science/math/sage/patches/docutils-0.18.1-deprecation.patch
+++ /dev/null
@@ -1,13 +0,0 @@
-diff --git a/src/sage/misc/sagedoc.py b/src/sage/misc/sagedoc.py
-index 08c4225b87..3a9bbe4ed0 100644
---- a/src/sage/misc/sagedoc.py
-+++ b/src/sage/misc/sagedoc.py
-@@ -1402,6 +1402,8 @@ class _sage_doc:
-             sage: identity_matrix.__doc__ in browse_sage_doc(identity_matrix, 'rst')
-             True
-             sage: browse_sage_doc(identity_matrix, 'html', False)             # optional - sphinx sagemath_doc_html
-+            ...
-+            FutureWarning: The configuration setting "embed_images" will be removed in Docutils 1.2. Use "image_loading: link".
-             '...div...File:...Type:...Definition:...identity_matrix...'
- 
-         In the 'text' version, double colons have been replaced with
diff --git a/pkgs/applications/science/math/sage/sage-src.nix b/pkgs/applications/science/math/sage/sage-src.nix
index a0375a5184a8..514cbb66ea7d 100644
--- a/pkgs/applications/science/math/sage/sage-src.nix
+++ b/pkgs/applications/science/math/sage/sage-src.nix
@@ -112,22 +112,27 @@ stdenv.mkDerivation rec {
     # adapted from https://trac.sagemath.org/ticket/23712#comment:22
     ./patches/tachyon-renamed-focallength.patch
 
-    # docutils 0.18.1 now triggers Sphinx warnings. tolerate them for
-    # now, because patching Sphinx is not feasible. remove when Sphinx
-    # 5.0 hits nixpkgs.
-    # https://github.com/sphinx-doc/sphinx/pull/10372
-    ./patches/docutils-0.18.1-deprecation.patch
-
     (fetchSageDiff {
       name = "eclib-20220621-update.patch";
       base = "9.7.beta4";
       rev = "9b65d73399b33043777ba628a4d318638aec6e0e";
       sha256 = "sha256-pcb9Q9a0ROCZTyfT7TRMtgEqCom8SgrtAaZ8ATgeqVI=";
     })
+
+    # https://trac.sagemath.org/ticket/34149
+    (fetchSageDiff {
+      name = "sphinx-5-update.patch";
+      base = "9.7.beta6";
+      rev = "6f9ceb7883376a1cacda51d84ec7870121860482";
+      sha256 = "sha256-prTCwBfl/wNXIkdjKLiMSe/B64wCXOjOTr4AVNiFruw=";
+    })
   ];
 
   patches = nixPatches ++ bugfixPatches ++ packageUpgradePatches;
 
+  # do not create .orig backup files if patch applies with fuzz
+  patchFlags = [ "--no-backup-if-mismatch" "-p1" ];
+
   postPatch = ''
     # Make sure sage can at least be imported without setting any environment
     # variables. It won't be close to feature complete though.