diff --git a/pkgs/development/compilers/rust/1_43.nix b/pkgs/development/compilers/rust/1_43.nix
new file mode 100644
index 000000000000..a1a9d17fcd55
--- /dev/null
+++ b/pkgs/development/compilers/rust/1_43.nix
@@ -0,0 +1,42 @@
+# New rust versions should first go to staging.
+# Things to check after updating:
+# 1. Rustc should produce rust binaries on x86_64-linux, aarch64-linux and x86_64-darwin:
+#    i.e. nix-shell -p fd or @GrahamcOfBorg build fd on github
+#    This testing can be also done by other volunteers as part of the pull
+#    request review, in case platforms cannot be covered.
+# 2. The LLVM version used for building should match with rust upstream.
+# 3. Firefox and Thunderbird should still build on x86_64-linux.
+
+{ stdenv, lib
+, buildPackages
+, newScope, callPackage
+, CoreFoundation, Security
+, llvmPackages_5
+, pkgsBuildTarget, pkgsBuildBuild
+} @ args:
+
+import ./default.nix {
+  rustcVersion = "1.43.0";
+  rustcSha256 = "18akhk0wz1my6y9vhardriy2ysc482z0fnjdcgs9gy59kmnarxkm";
+
+  # Note: the version MUST be one version prior to the version we're
+  # building
+  bootstrapVersion = "1.42.0";
+
+  # fetch hashes by running `print-hashes.sh 1.43.0`
+  bootstrapHashes = {
+    i686-unknown-linux-gnu = "1c89c12c8fc1a45dcbcb9ee2e21cc634b8453f1d4cdd658269263de686aab4e4";
+    x86_64-unknown-linux-gnu = "7d1e07ad9c8a33d8d039def7c0a131c5917aa3ea0af3d0cc399c6faf7b789052";
+    arm-unknown-linux-gnueabihf = "6cf776b910d08fb0d1f88be94464e7b20a50f9d8b2ec6372c3c385aec0b70e7a";
+    armv7-unknown-linux-gnueabihf = "a36e7f2bd148e325a7b8e7131b4226266cf522b1a2b12d585dad9c38ef68f4d9";
+    aarch64-unknown-linux-gnu = "fdd39f856a062af265012861949ff6654e2b7103be034d046bec84ebe46e8d2d";
+    x86_64-apple-darwin = "db1055c46e0d54b99da05e88c71fea21b3897e74a4f5ff9390e934f3f050c0a8";
+  };
+
+  selectRustPackage = pkgs: pkgs.rust_1_43;
+
+  rustcPatches = [
+  ];
+}
+
+(builtins.removeAttrs args [ "fetchpatch" ])
diff --git a/pkgs/development/compilers/rust/print-hashes.sh b/pkgs/development/compilers/rust/print-hashes.sh
index 1d46fe376d4b..957011fad376 100755
--- a/pkgs/development/compilers/rust/print-hashes.sh
+++ b/pkgs/development/compilers/rust/print-hashes.sh
@@ -13,7 +13,6 @@ PLATFORMS=(
   arm-unknown-linux-gnueabihf
   armv7-unknown-linux-gnueabihf
   aarch64-unknown-linux-gnu
-  i686-apple-darwin
   x86_64-apple-darwin
 )
 BASEURL=https://static.rust-lang.org/dist
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 37082a34c0e1..3778f309a793 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9016,10 +9016,14 @@ in
   rust_1_42 = callPackage ../development/compilers/rust/1_42.nix {
     inherit (darwin.apple_sdk.frameworks) CoreFoundation Security;
   };
-  rust = rust_1_42;
+  rust_1_43 = callPackage ../development/compilers/rust/1_43.nix {
+    inherit (darwin.apple_sdk.frameworks) CoreFoundation Security;
+  };
+  rust = rust_1_43;
 
   rustPackages_1_42 = rust_1_42.packages.stable;
-  rustPackages = rustPackages_1_42;
+  rustPackages_1_43 = rust_1_43.packages.stable;
+  rustPackages = rustPackages_1_43;
 
   inherit (rustPackages) cargo clippy rustc rustPlatform;
   inherit (rust) makeRustPlatform;
@@ -22121,6 +22125,7 @@ in
 
   thunderbird = callPackage ../applications/networking/mailreaders/thunderbird {
     inherit (gnome2) libIDL;
+    inherit (rustPackages_1_42) rustc;
     libpng = libpng_apng;
     gtk3Support = true;
   };