diff --git a/pkgs/development/compilers/gcc/patches/14/aarch64-fix-ice-subreg.patch b/pkgs/development/compilers/gcc/patches/14/aarch64-fix-ice-subreg.patch
deleted file mode 100644
index a8783ddbfa27..000000000000
--- a/pkgs/development/compilers/gcc/patches/14/aarch64-fix-ice-subreg.patch
+++ /dev/null
@@ -1,87 +0,0 @@
-diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
-index d3c381e82ce..6a481059bf0 100644
---- a/gcc/config/aarch64/aarch64.md
-+++ b/gcc/config/aarch64/aarch64.md
-@@ -6161,8 +6161,8 @@
- 			  (match_dup 1))
- 	(match_dup 2))]
-   {
--    operands[2] = lowpart_subreg (<GPI:MODE>mode, operands[2],
--				  <ALLX:MODE>mode);
-+    operands[2] = force_lowpart_subreg (<GPI:MODE>mode, operands[2],
-+					<ALLX:MODE>mode);
-   }
-   [(set_attr "type" "bfm,neon_ins_q,neon_ins_q")
-    (set_attr "arch" "*,simd,simd")]
-@@ -7210,7 +7210,7 @@
- 
-       emit_insn (gen_iorv2<v_int_equiv>3 (
- 	lowpart_subreg (V2<V_INT_EQUIV>mode, operands[0], <MODE>mode),
--	lowpart_subreg (V2<V_INT_EQUIV>mode, operands[1], <MODE>mode),
-+	force_lowpart_subreg (V2<V_INT_EQUIV>mode, operands[1], <MODE>mode),
- 	v_bitmask));
-       DONE;
-     }
-@@ -7255,8 +7255,8 @@
-   "TARGET_SIMD"
- {
-   rtx tmp = gen_reg_rtx (<VCONQ>mode);
--  rtx op1 = lowpart_subreg (<VCONQ>mode, operands[1], <MODE>mode);
--  rtx op2 = lowpart_subreg (<VCONQ>mode, operands[2], <MODE>mode);
-+  rtx op1 = force_lowpart_subreg (<VCONQ>mode, operands[1], <MODE>mode);
-+  rtx op2 = force_lowpart_subreg (<VCONQ>mode, operands[2], <MODE>mode);
-   emit_insn (gen_xorsign3 (<VCONQ>mode, tmp, op1, op2));
-   emit_move_insn (operands[0],
- 		  lowpart_subreg (<MODE>mode, tmp, <VCONQ>mode));
-diff --git a/gcc/explow.cc b/gcc/explow.cc
-index f6843398c4b..80f59418bca 100644
---- a/gcc/explow.cc
-+++ b/gcc/explow.cc
-@@ -760,6 +760,34 @@ force_subreg (machine_mode outermode, rtx op,
-   return simplify_gen_subreg (outermode, op, innermode, byte);
- }
- 
-+/* Try to return an rvalue expression for the OUTERMODE lowpart of OP,
-+   which has mode INNERMODE.  Allow OP to be forced into a new register
-+   if necessary.
-+
-+   Return null on failure.  */
-+
-+rtx
-+force_lowpart_subreg (machine_mode outermode, rtx op,
-+		      machine_mode innermode)
-+{
-+  auto byte = subreg_lowpart_offset (outermode, innermode);
-+  return force_subreg (outermode, op, innermode, byte);
-+}
-+
-+/* Try to return an rvalue expression for the OUTERMODE highpart of OP,
-+   which has mode INNERMODE.  Allow OP to be forced into a new register
-+   if necessary.
-+
-+   Return null on failure.  */
-+
-+rtx
-+force_highpart_subreg (machine_mode outermode, rtx op,
-+		       machine_mode innermode)
-+{
-+  auto byte = subreg_highpart_offset (outermode, innermode);
-+  return force_subreg (outermode, op, innermode, byte);
-+}
-+
- /* If X is a memory ref, copy its contents to a new temp reg and return
-    that reg.  Otherwise, return X.  */
- 
-diff --git a/gcc/explow.h b/gcc/explow.h
-index cbd1fcb7eb3..de89e9e2933 100644
---- a/gcc/explow.h
-+++ b/gcc/explow.h
-@@ -43,6 +43,8 @@ extern rtx copy_to_suggested_reg (rtx, rtx, machine_mode);
- extern rtx force_reg (machine_mode, rtx);
- 
- extern rtx force_subreg (machine_mode, rtx, machine_mode, poly_uint64);
-+extern rtx force_lowpart_subreg (machine_mode, rtx, machine_mode);
-+extern rtx force_highpart_subreg (machine_mode, rtx, machine_mode);
- 
- /* Return given rtx, copied into a new temp reg if it was in memory.  */
- extern rtx force_not_mem (rtx);
diff --git a/pkgs/development/compilers/gcc/patches/default.nix b/pkgs/development/compilers/gcc/patches/default.nix
index 598c42a48d3e..7adc06b35779 100644
--- a/pkgs/development/compilers/gcc/patches/default.nix
+++ b/pkgs/development/compilers/gcc/patches/default.nix
@@ -94,11 +94,6 @@ in
 ++ optional langD ./libphobos.patch
 ++ optional (!atLeast14) ./cfi_startproc-reorder-label-09-1.diff
 ++ optional (atLeast14 && !canApplyIainsDarwinPatches) ./cfi_startproc-reorder-label-14-1.diff
-# backports of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118501
-#          and https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118892
-#          and https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119133
-# (hopefully all three will be included in the upcoming 14.3.0 release)
-++ optional is14 ./14/aarch64-fix-ice-subreg.patch
 
 ## 2. Patches relevant to gcc>=12 on specific platforms ####################################
 
diff --git a/pkgs/development/compilers/gcc/versions.nix b/pkgs/development/compilers/gcc/versions.nix
index 3f9debb2d742..63921abef84d 100644
--- a/pkgs/development/compilers/gcc/versions.nix
+++ b/pkgs/development/compilers/gcc/versions.nix
@@ -1,7 +1,7 @@
 let
   majorMinorToVersionMap = {
     "15" = "15.1.0";
-    "14" = "14.2.1.20250322";
+    "14" = "14.3.0";
     "13" = "13.3.0";
     "12" = "12.4.0";
     "11" = "11.5.0";
@@ -18,7 +18,7 @@ let
       # 3 digits: releases (14.2.0)
       # 4 digits: snapshots (14.2.1.20250322)
       "15.1.0" = "sha256-4rCewhZg8B/s/7cV4BICZSFpQ/A40OSKmGhxPlTwbOo=";
-      "14.2.1.20250322" = "sha256-I3ROhiU4jYaB2aci2Z3B/mvLLTjBBoCF1CL7uiHTmUM=";
+      "14.3.0" = "sha256-4Nx3KXYlYxrI5Q+pL//v6Jmk63AlktpcMu8E4ik6yjo=";
       "13.3.0" = "sha256-CEXpYhyVQ6E/SE6UWEpJ/8ASmXDpkUYkI1/B0GGgwIM=";
       "12.4.0" = "sha256-cE9lJgTMvMsUvavzR4yVEciXiLEss7v/3tNzQZFqkXU=";
       "11.5.0" = "sha256-puIYaOrVRc+H8MAfhCduS1KB1nIJhZHByJYkHwk2NHg=";