diff --git a/nixos/modules/installer/tools/nix-fallback-paths.nix b/nixos/modules/installer/tools/nix-fallback-paths.nix
index 54d3a107d6276..67508cf32eef8 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/1w4b47zhp33md29wjhgg549pc281vv02-nix-2.18.4";
-  i686-linux = "/nix/store/hz02kn0ffn3wdi2xs7lndpr88v4v4fp2-nix-2.18.4";
-  aarch64-linux = "/nix/store/90zwqa9z2fgldc7ki1p5gfvglchjh9r6-nix-2.18.4";
-  x86_64-darwin = "/nix/store/bd1ix5mj9lj2yh7bqnmdjc24zlg5jivk-nix-2.18.4";
-  aarch64-darwin = "/nix/store/5hvsmklhqiay5i4q5vdkg60p8qpc69rz-nix-2.18.4";
+  x86_64-linux = "/nix/store/4rs65bbl7x7ba8xi65x3j9zfc219vp8j-nix-2.18.5";
+  i686-linux = "/nix/store/qfzjbq958jnscjl1k8wr6gmpi5876dw6-nix-2.18.5";
+  aarch64-linux = "/nix/store/ns0ir4zmhn4bj55h3vvjcx1y3h5f6gy5-nix-2.18.5";
+  x86_64-darwin = "/nix/store/h8pgzxglir6jdpv07plxz01z9ak7m9md-nix-2.18.5";
+  aarch64-darwin = "/nix/store/8grhqqmsmpsvn7d4m30g3jgwn5ik9i7k-nix-2.18.5";
 }
diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 0715d39dad4d3..33b5b4a877379 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 = "2.18.4";
-    hash = "sha256-tebjp83ABKrBW3d/6n/Irr1+xhtw8qIkqHZHJOoJaLk=";
+    version = "2.18.5";
+    hash = "sha256-xEcYQuJz6DjdYfS6GxIYcn8U+3Hgopne3CvqrNoGguQ=";
     self_attribute_name = "nix_2_18";
   };