diff --git a/pkgs/development/libraries/ncurses/1001-ncurses-Support-gnuabielfv1-2.patch b/pkgs/development/libraries/ncurses/1001-ncurses-Support-gnuabielfv1-2.patch
deleted file mode 100644
index 6ce69e6846cb..000000000000
--- a/pkgs/development/libraries/ncurses/1001-ncurses-Support-gnuabielfv1-2.patch
+++ /dev/null
@@ -1,72 +0,0 @@
-diff '--color=auto' -ruN a/aclocal.m4 b/aclocal.m4
---- a/aclocal.m4	2025-07-19 18:19:51.000000000 +0200
-+++ b/aclocal.m4	2025-07-25 14:11:19.900876172 +0200
-@@ -10290,7 +10290,7 @@
- 	cf_xopen_source="-D_SGI_SOURCE"
- 	cf_XOPEN_SOURCE=
- 	;;
--(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
-+(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnuabielfv*|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
- 	CF_GNU_SOURCE($cf_XOPEN_SOURCE)
- 	;;
- linux*musl)
-diff '--color=auto' -ruN a/Ada95/aclocal.m4 b/Ada95/aclocal.m4
---- a/Ada95/aclocal.m4	2025-07-19 18:38:31.000000000 +0200
-+++ b/Ada95/aclocal.m4	2025-07-25 14:11:57.495783459 +0200
-@@ -5430,7 +5430,7 @@
- 	cf_xopen_source="-D_SGI_SOURCE"
- 	cf_XOPEN_SOURCE=
- 	;;
--(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
-+(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnuabielfv*|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
- 	CF_GNU_SOURCE($cf_XOPEN_SOURCE)
- 	;;
- linux*musl)
-diff '--color=auto' -ruN a/Ada95/configure b/Ada95/configure
---- a/Ada95/configure	2025-07-19 18:40:05.000000000 +0200
-+++ b/Ada95/configure	2025-07-25 14:11:49.981449762 +0200
-@@ -13955,7 +13955,7 @@
- 	cf_xopen_source="-D_SGI_SOURCE"
- 	cf_XOPEN_SOURCE=
- 	;;
--(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
-+(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnuabielfv*|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
- 
- cf_gnu_xopen_source=$cf_XOPEN_SOURCE
- 
-diff '--color=auto' -ruN a/configure b/configure
---- a/configure	2025-07-19 19:00:40.000000000 +0200
-+++ b/configure	2025-07-25 14:11:02.884551699 +0200
-@@ -10737,7 +10737,7 @@
- 	cf_xopen_source="-D_SGI_SOURCE"
- 	cf_XOPEN_SOURCE=
- 	;;
--(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
-+(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnuabielfv*|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
- 
- cf_gnu_xopen_source=$cf_XOPEN_SOURCE
- 
-diff '--color=auto' -ruN a/test/aclocal.m4 b/test/aclocal.m4
---- a/test/aclocal.m4	2025-07-19 18:42:37.000000000 +0200
-+++ b/test/aclocal.m4	2025-07-25 14:11:41.551475534 +0200
-@@ -4658,7 +4658,7 @@
- 	cf_xopen_source="-D_SGI_SOURCE"
- 	cf_XOPEN_SOURCE=
- 	;;
--(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
-+(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnuabielfv*|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
- 	CF_GNU_SOURCE($cf_XOPEN_SOURCE)
- 	;;
- linux*musl)
-diff '--color=auto' -ruN a/test/configure b/test/configure
---- a/test/configure	2025-06-14 15:40:22.000000000 +0200
-+++ b/test/configure	2025-07-25 14:11:34.529155110 +0200
-@@ -4183,7 +4183,7 @@
- 	cf_xopen_source="-D_SGI_SOURCE"
- 	cf_XOPEN_SOURCE=
- 	;;
--(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
-+(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnuabielfv*|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin|msys|mingw*|linux*uclibc)
- 
- cf_gnu_xopen_source=$cf_XOPEN_SOURCE
- 
diff --git a/pkgs/development/libraries/ncurses/default.nix b/pkgs/development/libraries/ncurses/default.nix
index 54859b14d021..42f603449222 100644
--- a/pkgs/development/libraries/ncurses/default.nix
+++ b/pkgs/development/libraries/ncurses/default.nix
@@ -18,12 +18,12 @@
 }:
 
 stdenv.mkDerivation (finalAttrs: {
-  version = "6.5";
+  version = "6.6";
   pname = "ncurses" + lib.optionalString (abiVersion == "5") "-abi5-compat";
 
   src = fetchurl {
     url = "https://invisible-island.net/archives/ncurses/ncurses-${finalAttrs.version}.tar.gz";
-    hash = "sha256-E22RvCaamleF5fnpgLx2q1dCj2BM4+WlqQzrx2eXHMY=";
+    hash = "sha256-NVtMu+2ICwOBoExGYXt2VuNiWF1S6c+Epn4gCbdJ/xE=";
   };
 
   outputs = [
@@ -34,14 +34,6 @@ stdenv.mkDerivation (finalAttrs: {
   setOutputFlags = false; # some aren't supported
   separateDebugInfo = false;
 
-  patches = [
-    # linux-gnuabielfv{1,2} is not in ncurses' list of GNU-ish targets (or smth like that?).
-    # Causes some defines (_XOPEN_SOURCE=600, _DEFAULT_SOURCE) to not get set, so wcwidth is not exposed by system headers, which causes a FTBFS.
-    # Reported and fix submitted to upstream in https://lists.gnu.org/archive/html/bug-ncurses/2025-07/msg00040.html
-    # Backported to the 6.5 release (dropped some hunks for code that isn't in this release yet)
-    ./1001-ncurses-Support-gnuabielfv1-2.patch
-  ];
-
   postPatch = ''
     sed -i '1i #include <stdbool.h>' include/curses.h.in
   '';