diff --git a/README.md b/README.md
index 6fe957d3527ad9d8b8800156f74be0b839e06035..c977fa928cda960a8d81388634f9eef475b9ffe2 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,14 @@
 # Horizon Haskell (Advance Package Set)
 
-horizon-advance is a Package Set targetting GHC mainline. This package set
-extends
+horizon-advance is a Package Set targetting GHC mainline. This package
+set extends
 [horizon-core](https://gitlab.horizon-haskell.net/package-sets/horizon-core).
 
-While horizon-core only contains packages required to bootstrap the horizon
-toolchain, horizon-advance contains packages required for canary testing
-any compatibility issues with GHC mainline. This includes a mix of things
-that make heavy use of system libraries, or perhaps template-haskell or
-type-checker plugins.
+While horizon-core only contains packages required to bootstrap the
+horizon toolchain, horizon-advance contains packages required for canary
+testing any compatibility issues with GHC mainline. This includes a mix
+of things that make heavy use of system libraries, or perhaps
+template-haskell or type-checker plugins.
 
 The following things are always expected to be here:
 
@@ -37,9 +37,9 @@ The following things are always expected to be here:
 * vulkan-utils
 * wai-app-static
 
-This is the master branch building against the GHC 9.12 pre-release.
+This is the master branch building against ghc-9.12-alpha.
 
-For other ocmpiler versions, see the protected branches named `lts/ghc-*`.
+For other compiler versions, see the protected branches named `lts/ghc-*`.
 
 ## Updating the Package Set
 
diff --git a/flake.lock b/flake.lock
index cf8897dc0ea41a61470be5fbb1e3bec3a55407a3..bb471c76ea1cc372ff963002dad01a2ef9c76512 100644
--- a/flake.lock
+++ b/flake.lock
@@ -69,11 +69,11 @@
         "nixpkgs": "nixpkgs_3"
       },
       "locked": {
-        "lastModified": 1728019357,
-        "narHash": "sha256-8FB4varne9uSaq6S22470RKWIuZZRVm7tzMa+mlc1vA=",
+        "lastModified": 1729111300,
+        "narHash": "sha256-crbowiJMHwZlHZFUQwuo8vqVuj4kwuXeISWVDUY90q4=",
         "ref": "refs/heads/master",
-        "rev": "6e77e3b661ecb7318332f510f1c85480df7cda88",
-        "revCount": 1383,
+        "rev": "1ef0c63679552db368c7607244a8fc9a226e943c",
+        "revCount": 1391,
         "type": "git",
         "url": "https://gitlab.horizon-haskell.net/package-sets/horizon-core"
       },
@@ -189,11 +189,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1727914564,
-        "narHash": "sha256-S0KZLpF6yfX6c6ehfz2svB3VzYNJ8YxfQJH6NgyHNk8=",
+        "lastModified": 1729037774,
+        "narHash": "sha256-BmdllvnhVXFwOoh4y1lHydWp1J57gAK2qizzcxlgdeU=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9d0ab8b5db9ba62989e648db86c66c0fb620b6e9",
+        "rev": "fe21c441dbc7103502d680cad61016cd7134835b",
         "type": "github"
       },
       "original": {
@@ -205,11 +205,11 @@
     },
     "nixpkgs_4": {
       "locked": {
-        "lastModified": 1728000969,
-        "narHash": "sha256-MYiswvy74bWkXGSk+D8Hhu7Gg2iel6Tu4J3sbgC3krg=",
+        "lastModified": 1729037774,
+        "narHash": "sha256-BmdllvnhVXFwOoh4y1lHydWp1J57gAK2qizzcxlgdeU=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d4db941d790cc72a8b6867ccf85ef4e6d77e1097",
+        "rev": "fe21c441dbc7103502d680cad61016cd7134835b",
         "type": "github"
       },
       "original": {