diff --git a/CMakeLists.txt b/CMakeLists.txt
index e97936d..b0965ce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -87,6 +87,8 @@ find_package(Eigen3 REQUIRED)
 find_package(FastFloat REQUIRED)
 find_package(Taskflow REQUIRED)
 find_package(Threads REQUIRED)
+find_package(byte-lite REQUIRED)
+find_package(span-lite REQUIRED)
 find_package(cpp-sort REQUIRED)
 find_package(eve REQUIRED)
 find_package(fmt REQUIRED)
@@ -236,6 +238,8 @@ target_link_libraries(operon_operon PRIVATE
     Taskflow::Taskflow
     cpp-sort::cpp-sort
     unordered_dense::unordered_dense
+    nonstd::byte-lite
+    nonstd::span-lite
 )
 
 if (USE_CERES AND Ceres_FOUND)
diff --git a/flake.lock b/flake.lock
index 6aed352..a0b66c8 100644
--- a/flake.lock
+++ b/flake.lock
@@ -97,11 +97,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1711220645,
-        "narHash": "sha256-A+hFByNhANZCVK2Ii95urQkRcNvym32MgWD0N2YfgmM=",
+        "lastModified": 1712319166,
+        "narHash": "sha256-j5Li13TbVLOD0KAx16MkZ1Am5sswSjGB3JPZNSjpizw=",
         "owner": "foolnotion",
         "repo": "nur-pkg",
-        "rev": "5d144f483fcefeb93f2117cd4c58d9ed26c9528e",
+        "rev": "dfcee20b25049b2bdae66d9c5ffd327ea5a00572",
         "type": "github"
       },
       "original": {
@@ -118,11 +118,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1711220645,
-        "narHash": "sha256-A+hFByNhANZCVK2Ii95urQkRcNvym32MgWD0N2YfgmM=",
+        "lastModified": 1712319166,
+        "narHash": "sha256-j5Li13TbVLOD0KAx16MkZ1Am5sswSjGB3JPZNSjpizw=",
         "owner": "foolnotion",
         "repo": "nur-pkg",
-        "rev": "5d144f483fcefeb93f2117cd4c58d9ed26c9528e",
+        "rev": "dfcee20b25049b2bdae66d9c5ffd327ea5a00572",
         "type": "github"
       },
       "original": {
@@ -136,11 +136,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1711220645,
-        "narHash": "sha256-A+hFByNhANZCVK2Ii95urQkRcNvym32MgWD0N2YfgmM=",
+        "lastModified": 1712319166,
+        "narHash": "sha256-j5Li13TbVLOD0KAx16MkZ1Am5sswSjGB3JPZNSjpizw=",
         "owner": "foolnotion",
         "repo": "nur-pkg",
-        "rev": "5d144f483fcefeb93f2117cd4c58d9ed26c9528e",
+        "rev": "dfcee20b25049b2bdae66d9c5ffd327ea5a00572",
         "type": "github"
       },
       "original": {
@@ -154,11 +154,11 @@
         "nixpkgs": "nixpkgs_3"
       },
       "locked": {
-        "lastModified": 1711220645,
-        "narHash": "sha256-A+hFByNhANZCVK2Ii95urQkRcNvym32MgWD0N2YfgmM=",
+        "lastModified": 1712319166,
+        "narHash": "sha256-j5Li13TbVLOD0KAx16MkZ1Am5sswSjGB3JPZNSjpizw=",
         "owner": "foolnotion",
         "repo": "nur-pkg",
-        "rev": "5d144f483fcefeb93f2117cd4c58d9ed26c9528e",
+        "rev": "dfcee20b25049b2bdae66d9c5ffd327ea5a00572",
         "type": "github"
       },
       "original": {
@@ -191,11 +191,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1711307772,
-        "narHash": "sha256-GLpSqBc/5g/AV4HfbBJ95FnJz4a8owH/UJP8P4BkakY=",
+        "lastModified": 1712318770,
+        "narHash": "sha256-shExu5MIhGyPwiFprg/AkYsal8zT4VdZpT0edfcabv8=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "30392650ee17f4dba3b8ddb6aed194a5cb876b35",
+        "rev": "12dbef936ba2d4bae37d4835c1fe00b5245c9c3a",
         "type": "github"
       },
       "original": {
@@ -207,11 +207,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1711307772,
-        "narHash": "sha256-GLpSqBc/5g/AV4HfbBJ95FnJz4a8owH/UJP8P4BkakY=",
+        "lastModified": 1712318770,
+        "narHash": "sha256-shExu5MIhGyPwiFprg/AkYsal8zT4VdZpT0edfcabv8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "30392650ee17f4dba3b8ddb6aed194a5cb876b35",
+        "rev": "12dbef936ba2d4bae37d4835c1fe00b5245c9c3a",
         "type": "github"
       },
       "original": {
@@ -223,11 +223,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1711307772,
-        "narHash": "sha256-GLpSqBc/5g/AV4HfbBJ95FnJz4a8owH/UJP8P4BkakY=",
+        "lastModified": 1712318770,
+        "narHash": "sha256-shExu5MIhGyPwiFprg/AkYsal8zT4VdZpT0edfcabv8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "30392650ee17f4dba3b8ddb6aed194a5cb876b35",
+        "rev": "12dbef936ba2d4bae37d4835c1fe00b5245c9c3a",
         "type": "github"
       },
       "original": {
@@ -376,16 +376,15 @@
         ]
       },
       "locked": {
-        "lastModified": 1710675892,
-        "narHash": "sha256-zlKiMQBKLm66rj7xOWpfugVCbSEAPiHZinWRSeoV/w4=",
+        "lastModified": 1711321977,
+        "narHash": "sha256-yGbdec6OexJt+4H5V1pzub9R5fH4J2l+vXQWEq0/ohU=",
         "owner": "heal-research",
         "repo": "vstat",
-        "rev": "06a8f15b22a0da523097f3fe500489c08a3ec086",
+        "rev": "428ec2385aebf44d9ba89064b2b2ef419fd6206a",
         "type": "github"
       },
       "original": {
         "owner": "heal-research",
-        "ref": "cpp20-eve",
         "repo": "vstat",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index ac4d1a3..c305097 100644
--- a/flake.nix
+++ b/flake.nix
@@ -66,6 +66,9 @@
             vdt.packages.${system}.default
             vstat.packages.${system}.default
             lbfgs.packages.${system}.default
+            # ned14 deps
+            byte-lite
+            span-lite
             ned14-outcome
             ned14-quickcpplib
             ned14-status-code