diff --git a/nix/base-system/flake.nix b/nix/base-system/flake.nix
index fb2bdf0..0433972 100644
--- a/nix/base-system/flake.nix
+++ b/nix/base-system/flake.nix
@@ -3,7 +3,7 @@
     nixpkgs.url = "github:nixos/nixpkgs/release-23.05";
     sile-flake.url = "github:sile-typesetter/sile";
     durnitisp-flake.url = "github:zaphar/durnitisp";
-    runwhen-flake.url = "github:zaphar/runwhen";
+    runwhen-flake.url = "github:zaphar/runwhen/v0.0.8";
     agenix-flake.url = "github:ryantm/agenix";
     rust-overlay-flake = {
       url = "github:oxalica/rust-overlay";
diff --git a/nix/darwin/flake.lock b/nix/darwin/flake.lock
index 6854c93..6005c94 100644
--- a/nix/darwin/flake.lock
+++ b/nix/darwin/flake.lock
@@ -34,12 +34,12 @@
       },
       "locked": {
         "lastModified": 1,
-        "narHash": "sha256-slV/Wip7cNLLNJXA/u25+h1l7ePi+1+/0T+GfgO+JA4=",
-        "path": "/nix/store/vqf2xx1r7is6hiy0m3pazs6cin0yhiqr-source/nix/base-system",
+        "narHash": "sha256-vXgdAGgsSloY711Gj/dyarLLnQLNMbW15OR6V/XWC9c=",
+        "path": "/nix/store/sp8xifa5sy2ypv0zfs63crz4kjlha82q-source/nix/base-system",
         "type": "path"
       },
       "original": {
-        "path": "/nix/store/vqf2xx1r7is6hiy0m3pazs6cin0yhiqr-source/nix/base-system",
+        "path": "/nix/store/sp8xifa5sy2ypv0zfs63crz4kjlha82q-source/nix/base-system",
         "type": "path"
       }
     },
@@ -68,7 +68,7 @@
     },
     "darwin_2": {
       "inputs": {
-        "nixpkgs": "nixpkgs_7"
+        "nixpkgs": "nixpkgs_6"
       },
       "locked": {
         "lastModified": 1687691275,
@@ -201,21 +201,6 @@
       }
     },
     "flake-utils_4": {
-      "locked": {
-        "lastModified": 1637014545,
-        "narHash": "sha256-26IZAc5yzlD9FlDT54io1oqG/bBoyka+FJk5guaX4x4=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "bba5dcc8e0b20ab664967ad83d24d64cb64ec4f4",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "flake-utils_5": {
       "inputs": {
         "systems": "systems_2"
       },
@@ -233,7 +218,7 @@
         "type": "github"
       }
     },
-    "flake-utils_6": {
+    "flake-utils_5": {
       "inputs": {
         "systems": "systems_3"
       },
@@ -426,21 +411,6 @@
       }
     },
     "nixpkgs_5": {
-      "locked": {
-        "lastModified": 1650222748,
-        "narHash": "sha256-AHh/goEfG5hlhIMVgGQwACbuv5Wit2ND9vrcB4QthJs=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "ba88a5afa6fff7710c17b5423ff9d721386c4164",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_6": {
       "locked": {
         "lastModified": 1682109806,
         "narHash": "sha256-d9g7RKNShMLboTWwukM+RObDWWpHKaqTYXB48clBWXI=",
@@ -456,7 +426,7 @@
         "type": "github"
       }
     },
-    "nixpkgs_7": {
+    "nixpkgs_6": {
       "locked": {
         "lastModified": 1687274257,
         "narHash": "sha256-TutzPriQcZ8FghDhEolnHcYU2oHIG5XWF+/SUBNnAOE=",
@@ -469,7 +439,7 @@
         "type": "indirect"
       }
     },
-    "nixpkgs_8": {
+    "nixpkgs_7": {
       "locked": {
         "lastModified": 1689326639,
         "narHash": "sha256-79zi0t83Dcc2dE0NuYZ+2hqtKXZN1yWVq5mtx8D2d7Y=",
@@ -489,27 +459,26 @@
       "inputs": {
         "base-system": "base-system",
         "darwin": "darwin_2",
-        "nixpkgs": "nixpkgs_8"
+        "nixpkgs": "nixpkgs_7"
       }
     },
     "runwhen-flake": {
       "inputs": {
         "flake-compat": "flake-compat_2",
         "flake-utils": "flake-utils_3",
-        "naersk": "naersk_2",
-        "nixpkgs": "nixpkgs_5",
-        "rust-overlay": "rust-overlay_2"
+        "naersk": "naersk_2"
       },
       "locked": {
-        "lastModified": 1692062428,
-        "narHash": "sha256-0n/BRDjMP/iRPghtAJ07ah+dySnpXcxMC2EygSJE+Ow=",
+        "lastModified": 1692313277,
+        "narHash": "sha256-UOa7z6x6N6rldV2pnrHKftz/BbAiHAXlMUGlEfUUfAQ=",
         "owner": "zaphar",
         "repo": "runwhen",
-        "rev": "c5f339cd27284b426bb732ef9369813976d1392d",
+        "rev": "b69af94e5aa4b3e7a8ca92d0b372d60f8651bc12",
         "type": "github"
       },
       "original": {
         "owner": "zaphar",
+        "ref": "v0.0.8",
         "repo": "runwhen",
         "type": "github"
       }
@@ -543,7 +512,7 @@
     },
     "rust-overlay-flake": {
       "inputs": {
-        "flake-utils": "flake-utils_5",
+        "flake-utils": "flake-utils_4",
         "nixpkgs": [
           "base-system",
           "nixpkgs"
@@ -563,36 +532,13 @@
         "type": "github"
       }
     },
-    "rust-overlay_2": {
-      "inputs": {
-        "flake-utils": "flake-utils_4",
-        "nixpkgs": [
-          "base-system",
-          "runwhen-flake",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1650162887,
-        "narHash": "sha256-e23LlN7NQGxrsSWNNAjyvrWlZ3kwFSav9kXbayibKWc=",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "26b570500cdd7a359526524e9abad341891122a6",
-        "type": "github"
-      },
-      "original": {
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "type": "github"
-      }
-    },
     "sile-flake": {
       "inputs": {
         "flake-compat": "flake-compat_3",
-        "flake-utils": "flake-utils_6",
+        "flake-utils": "flake-utils_5",
         "gitignore": "gitignore",
         "libtexpdf-src": "libtexpdf-src",
-        "nixpkgs": "nixpkgs_6"
+        "nixpkgs": "nixpkgs_5"
       },
       "locked": {
         "lastModified": 1687444516,