diff --git a/flake.lock b/flake.lock
index 7c28c5a..43c5537 100644
--- a/flake.lock
+++ b/flake.lock
@@ -104,6 +104,45 @@
         "type": "github"
       }
     },
+    "flake-utils_4": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nix-github-actions": {
+      "inputs": {
+        "nixpkgs": [
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1698974481,
+        "narHash": "sha256-yPncV9Ohdz1zPZxYHQf47S8S0VrnhV7nNhCawY46hDA=",
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "rev": "4bb5e752616262457bc7ca5882192a564c0472d2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1694499547,
@@ -122,26 +161,51 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1700678569,
-        "narHash": "sha256-2Ki+2UvOidxEb3xB4ADqlbPQ2BZOF4uZMR094O8or2I=",
+        "lastModified": 1702780907,
+        "narHash": "sha256-blbrBBXjjZt6OKTcYX1jpe9SRof2P9ZYWPzq22tzXAA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "8f1180704ac35baded1a74164365ac7cdfba6f38",
+        "rev": "1e2e384c5b7c50dbf8e9c441a9e58d85f408b01f",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-23.05",
+        "ref": "nixos-23.11",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
+    "poetry2nix": {
+      "inputs": {
+        "flake-utils": "flake-utils_4",
+        "nix-github-actions": "nix-github-actions",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "systems": "systems_3",
+        "treefmt-nix": "treefmt-nix"
+      },
+      "locked": {
+        "lastModified": 1702591455,
+        "narHash": "sha256-vK54IZysaxuUOe+abJO0wD40bxqwfZ2aBOhUWS/O/oA=",
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "9d9d434528404a22fb0c8283fea1ea3a7410ff80",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "epnix": "epnix",
         "flake-compat": "flake-compat",
         "flake-utils": "flake-utils_3",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs_2",
+        "poetry2nix": "poetry2nix"
       }
     },
     "systems": {
@@ -158,6 +222,56 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_3": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1699786194,
+        "narHash": "sha256-3h3EH1FXQkIeAuzaWB+nK0XK54uSD46pp+dMD3gAcB4=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "e82f32aa7f06bbbd56d7b12186d555223dc399d1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 5b099c3..1982ad9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,15 +2,22 @@
   description = "A very basic flake";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
+    poetry2nix = {
+      url = "github:nix-community/poetry2nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     flake-utils.url = "github:numtide/flake-utils";
     epnix.url = "github:epics-extensions/EPNix";
     flake-compat.url = "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz";
   };
 
+  nixConfig.commit-lockfile-summary = "chore(deps): update flake.lock";
+
   outputs = {
     self,
     nixpkgs,
+    poetry2nix,
     flake-utils,
     epnix,
     flake-compat,
@@ -25,6 +32,8 @@
           })
         ];
       };
+      inherit (epnix.packages.${system}) epics-base;
+      inherit (poetry2nix.lib.mkPoetry2Nix {inherit pkgs;}) mkPoetryApplication;
     in {
       packages.default = let
         # Numpy 1.19.5 doesn't compile with Python3.10+
@@ -33,7 +42,7 @@
         # support Python 3.6, which we need to support older systems.
         python = pkgs.python39;
       in
-        pkgs.poetry2nix.mkPoetryApplication {
+        mkPoetryApplication {
           projectDir = ./.;
 
           inherit python;
@@ -41,15 +50,7 @@
           nativeBuildInputs = with pkgs; [makeWrapper];
           propagatedBuildInputs = with python.pkgs; [tkinter];
 
-          overrides = pkgs.poetry2nix.overrides.withDefaults (_final: prev: {
-            reportlab = prev.reportlab.overridePythonAttrs (_old: {
-              buildInputs = with pkgs; [(freetype.overrideAttrs (_: {dontDisableStatic = true;}))];
-            });
-          });
-
-          postInstall = let
-            inherit (epnix.packages.x86_64-linux) epics-base;
-          in ''
+          postInstall = ''
             wrapProgram $out/bin/wetest \
               --set PYEPICS_LIBCA "${epics-base}/lib/linux-x86_64/libca.so"
           '';
@@ -70,7 +71,9 @@
         };
 
       devShells.default = pkgs.mkShell {
-        nativeBuildInputs = with pkgs; [poetry python39Full];
+        inputsFrom = [self.packages.${system}.default];
+        nativeBuildInputs = with pkgs; [poetry];
+        env.PYEPICS_LIBCA = "${epics-base}/lib/linux-x86_64/libca.so";
       };
 
       checks = import ./nix/checks {inherit pkgs;};