diff --git a/nixos/modules/installer/tools/nix-fallback-paths.nix b/nixos/modules/installer/tools/nix-fallback-paths.nix
index e4241e965403..9669ec5e37f3 100644
--- a/nixos/modules/installer/tools/nix-fallback-paths.nix
+++ b/nixos/modules/installer/tools/nix-fallback-paths.nix
@@ -1,7 +1,7 @@
 {
-  x86_64-linux = "/nix/store/azvn85cras6xv4z5j85fiy406f24r1q0-nix-2.18.1";
-  i686-linux = "/nix/store/9bnwy7f9h0kzdzmcnjjsjg0aak5waj40-nix-2.18.1";
-  aarch64-linux = "/nix/store/hh65xwqm9s040s3cgn9vzcmrxj0sf5ij-nix-2.18.1";
-  x86_64-darwin = "/nix/store/6zi5fqzn9n17wrk8r41rhdw4j7jqqsi3-nix-2.18.1";
-  aarch64-darwin = "/nix/store/0pbq6wzr2f1jgpn5212knyxpwmkjgjah-nix-2.18.1";
+  x86_64-linux = "/nix/store/yrsmzlw2lgbknzwic1gy1gmv3l2w1ax8-nix-2.18.3";
+  i686-linux = "/nix/store/ds9381l9mlwfaclvqnkzn3jl4qb8m3y1-nix-2.18.3";
+  aarch64-linux = "/nix/store/hw1zny3f8520zyskmp1qaybv1ir5ilxh-nix-2.18.3";
+  x86_64-darwin = "/nix/store/z08yc4sl1fr65q53wz6pw30h67qafaln-nix-2.18.3";
+  aarch64-darwin = "/nix/store/p57m7m0wrz8sqxiwinzpwzqzak82zn75-nix-2.18.3";
 }
diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 5f2a9dadfd6b..f5a351ed35aa 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -147,8 +147,8 @@ in lib.makeExtensible (self: ({
   };
 
   nix_2_18 = common {
-    version = "2.18.2";
-    hash = "sha256-8gNJlBlv2bnffRg0CejiBXc6U/S6YeCLAdHrYvTPyoY=";
+    version = "2.18.3";
+    hash = "sha256-430V4oN1Pid0h3J1yucrik6lbDh5D+pHI455bzLPEDY=";
     self_attribute_name = "nix_2_18";
   };