diff --git a/bison-3.8.2-gcc15-glibcxx-assertions.patch b/bison-3.8.2-gcc15-glibcxx-assertions.patch
deleted file mode 100644
index 245cc84..0000000
--- a/bison-3.8.2-gcc15-glibcxx-assertions.patch
+++ /dev/null
@@ -1,69 +0,0 @@
-https://bugs.gentoo.org/935754
-https://lists.gnu.org/archive/html/bison-patches/2024-07/msg00000.html
-
-* data/skeletons/glr2.cc (yyundeleteLastStack): Recover
-yylookaheadNeeds stack entry also, to prevent desyncing the sizes
-of yystates and yylookaheadNeeds.
-(class glr_state_set): New field yylookaheadNeedLastDeleted,
-tracks lookahead need of last deleted state.
-(yymarkStackDeleted): Save yylookaheadNeeds also.
----
-Hi!
-
-GCC 15 has added bounds-checks to vector<bool> when assertions are
-enabled.  This has caught a bug in Bison.  See bug referenced above.
-
-Now, WRT the fix: I am not sure of its correctness, but it appears to
-pass tests and everything seems to indicate that the presumption it is
-based on is correct.  That presumption is that the two stacks mentioned
-above (yylookaheadNeeds and yystates) ought to be the same size.  I
-inferred this because all other locations that alter the size of the two
-vectors appear to do so in lock-step.
-
-TIA, have a lovely day.
-
- data/skeletons/glr2.cc | 8 +++++++-
- 1 file changed, 7 insertions(+), 1 deletion(-)
-
-diff --git a/data/skeletons/glr2.cc b/data/skeletons/glr2.cc
-index 970ccfdf..8b962d6f 100644
---- a/data/skeletons/glr2.cc
-+++ b/data/skeletons/glr2.cc
-@@ -1080,7 +1080,10 @@ namespace
-     {
-       size_t k = yyk.uget ();
-       if (yystates[k] != YY_NULLPTR)
--        yylastDeleted = yystates[k];
-+        {
-+          yylastDeleted = yystates[k];
-+          yylookaheadNeedLastDeleted = yylookaheadNeeds[k];
-+        }
-       yystates[k] = YY_NULLPTR;
-     }
- 
-@@ -1093,6 +1096,7 @@ namespace
-       if (yylastDeleted == YY_NULLPTR || !yystates.empty ())
-         return;
-       yystates.push_back (yylastDeleted);
-+      yylookaheadNeeds.push_back (yylookaheadNeedLastDeleted);
-       YYCDEBUG << "Restoring last deleted stack as stack #0.\n";
-       clearLastDeleted ();
-     }
-@@ -1102,6 +1106,7 @@ namespace
-     void
-     yyremoveDeletes ()
-     {
-+      YYASSERT(yystates.size () == yylookaheadNeeds.size ());
-       size_t newsize = yystates.size ();
-       /* j is the number of live stacks we have seen.  */
-       for (size_t i = 0, j = 0; j < newsize; ++i)
-@@ -1160,6 +1165,7 @@ namespace
- 
-     /** The last stack we invalidated.  */
-     glr_state* yylastDeleted;
-+    bool yylookaheadNeedLastDeleted;
-   }; // class glr_state_set
- } // namespace
- 
--- 
-2.45.2
diff --git a/bison.spec b/bison.spec
index eabe3b8..be0e4c2 100644
--- a/bison.spec
+++ b/bison.spec
@@ -1,7 +1,7 @@
 Summary: A GNU general-purpose parser generator
 Name: bison
 Version: 3.8.2
-Release: 11%{?dist}
+Release: 9%{?dist}
 
 # An SPDX license string check done against bison-3.8.2 found strings
 # corresponding to the following licenses across the bison source tree:
@@ -14,9 +14,6 @@ Source1: https://ftp.gnu.org/gnu/%{name}/%{name}-%{version}.tar.xz.sig
 # gpg2 --export --export-options export-minimal 7DF84374B1EE1F9764BBE25D0DDCAA3278D5264E > gpgkey-7DF84374B1EE1F9764BBE25D0DDCAA3278D5264E.gpg
 Source2: gpgkey-7DF84374B1EE1F9764BBE25D0DDCAA3278D5264E.gpg
 
-# from Gentoo sys-devel/bison
-Patch0: bison-3.8.2-gcc15-glibcxx-assertions.patch
-
 # testsuite dependency
 BuildRequires: gcc-c++
 BuildRequires: autoconf
@@ -83,7 +80,7 @@ Bison manual section for more information.
 
 %prep
 %{gpgverify} --keyring='%{SOURCE2}' --signature='%{SOURCE1}' --data='%{SOURCE0}'
-%autosetup -p1
+%autosetup
 
 %build
 %configure
@@ -127,12 +124,6 @@ gzip -9nf ${RPM_BUILD_ROOT}%{_infodir}/bison.info*
 %{_libdir}/liby.a
 
 %changelog
-* Wed Jul 23 2025 Fedora Release Engineering <releng@fedoraproject.org> - 3.8.2-11
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
-
-* Thu Jan 16 2025 Fedora Release Engineering <releng@fedoraproject.org> - 3.8.2-10
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild
-
 * Wed Jul 17 2024 Fedora Release Engineering <releng@fedoraproject.org> - 3.8.2-9
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild