diff --git a/flake.lock b/flake.lock
index f8c3b9a..5b13a6b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -3,11 +3,11 @@
     "flake-compat": {
       "flake": false,
       "locked": {
-        "lastModified": 1650374568,
-        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
         "owner": "edolstra",
         "repo": "flake-compat",
-        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
         "type": "github"
       },
       "original": {
@@ -18,11 +18,11 @@
     },
     "nix-filter": {
       "locked": {
-        "lastModified": 1653590866,
-        "narHash": "sha256-E4yKIrt/S//WfW5D9IhQ1dVuaAy8RE7EiCMfnbrOC78=",
+        "lastModified": 1675361037,
+        "narHash": "sha256-CTbDuDxFD3U3g/dWUB+r+B/snIe+qqP1R+1myuFGe2I=",
         "owner": "numtide",
         "repo": "nix-filter",
-        "rev": "3e81a637cdf9f6e9b39aeb4d6e6394d1ad158e16",
+        "rev": "e1b2f96c2a31415f362268bc48c3fccf47dff6eb",
         "type": "github"
       },
       "original": {
@@ -33,11 +33,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1652840887,
-        "narHash": "sha256-gEK4NNa4GwIgTZE63kt/4WTFAWRTJVSa30+h4ZjFh9U=",
+        "lastModified": 1675698036,
+        "narHash": "sha256-BgsQkQewdlQi8gapJN4phpxkI/FCE/2sORBaFcYbp/A=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "52dc75a4fee3fdbcb792cb6fba009876b912bfe0",
+        "rev": "1046c7b92e908a1202c0f1ba3fc21d19e1cf1b62",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 2810dca..8d665fd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -59,10 +59,10 @@
       inherit (pkgs) lib overlays; # -> lib = pkgs.lib;overlays = pkgs.overlays;
     in rec {
       math-optim = with pkgs;
-        buildGo118Module rec {
+        buildGo119Module rec {
           pname = "${projname}";
           buildInputs = [
-            go_1_18
+            go_1_19
             # gcc
             # glibc
             # glibc.static
@@ -151,7 +151,7 @@
         pkgs = import nixpkgs {
           inherit system;
           overlays = [
-            (import ./overlay.nix)
+            # (import ./overlay.nix)
           ];
         };
         goPkgs = import nixpkgs {
@@ -161,7 +161,7 @@
             self.overlays
             or []
             ++ [
-              (import ./overlay.nix)
+              # (import ./overlay.nix)
             ];
         };
         gob = pkgs.writeShellScriptBin "gob" ''
@@ -227,7 +227,7 @@
                 # use pathed go, as it's (supposed to be) faster with cgo,
                 # which will inevitably encountered anyway.
                 # goPkgs.go
-                go_1_18
+                go_1_19
                 go-tools
                 gopls
                 gofumpt