diff --git a/flake.lock b/flake.lock
index 2871e70a..ae4f60eb 100644
--- a/flake.lock
+++ b/flake.lock
@@ -16,6 +16,22 @@
         "type": "github"
       }
     },
+    "libgit2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1697646580,
+        "narHash": "sha256-oX4Z3S9WtJlwvj0uH9HlYcWv+x1hqp8mhXl7HsLu2f0=",
+        "owner": "libgit2",
+        "repo": "libgit2",
+        "rev": "45fd9ed7ae1a9b74b957ef4f337bc3c8b3df01b5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "libgit2",
+        "repo": "libgit2",
+        "type": "github"
+      }
+    },
     "lowdown-src": {
       "flake": false,
       "locked": {
@@ -35,6 +51,7 @@
     "nix": {
       "inputs": {
         "flake-compat": "flake-compat",
+        "libgit2": "libgit2",
         "lowdown-src": "lowdown-src",
         "nixpkgs": [
           "nixpkgs"
@@ -42,16 +59,15 @@
         "nixpkgs-regression": "nixpkgs-regression"
       },
       "locked": {
-        "lastModified": 1701122567,
-        "narHash": "sha256-iA8DqS+W2fWTfR+nNJSvMHqQ+4NpYMRT3b+2zS6JTvE=",
+        "lastModified": 1701948782,
+        "narHash": "sha256-rEu4hLHZIy3fgf88BpiaVfl79hNSESRfQNbmxAO5uzg=",
         "owner": "NixOS",
         "repo": "nix",
-        "rev": "50f8f1c8bc019a4c0fd098b9ac674b94cfc6af0d",
+        "rev": "c3827ff6348a4d5199eaddf8dbc2ca2e2ef46ec5",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "2.19.2",
         "repo": "nix",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index 5a5aef55..fdeaa6ca 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "A Nix-based continuous build system";
 
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
-  inputs.nix.url = "github:NixOS/nix/2.19.2";
+  inputs.nix.url = "github:NixOS/nix";
   inputs.nix.inputs.nixpkgs.follows = "nixpkgs";
 
   outputs = { self, nixpkgs, nix }:
diff --git a/src/hydra-queue-runner/build-remote.cc b/src/hydra-queue-runner/build-remote.cc
index f41585c8..dad414bf 100644
--- a/src/hydra-queue-runner/build-remote.cc
+++ b/src/hydra-queue-runner/build-remote.cc
@@ -350,7 +350,7 @@ static std::map<StorePath, ValidPathInfo> queryPathInfos(
         auto references = ServeProto::Serialise<StorePathSet>::read(localStore, conn);
         readLongLong(conn.from); // download size
         auto narSize = readLongLong(conn.from);
-        auto narHash = Hash::parseAny(readString(conn.from), htSHA256);
+        auto narHash = Hash::parseAny(readString(conn.from), HashAlgorithm::SHA256);
         auto ca = ContentAddress::parseOpt(readString(conn.from));
         readStrings<StringSet>(conn.from); // sigs
         ValidPathInfo info(localStore.parseStorePath(storePathS), narHash);
diff --git a/src/hydra-queue-runner/nar-extractor.cc b/src/hydra-queue-runner/nar-extractor.cc
index 3c6857bf..ff4aa268 100644
--- a/src/hydra-queue-runner/nar-extractor.cc
+++ b/src/hydra-queue-runner/nar-extractor.cc
@@ -42,7 +42,7 @@ struct Extractor : ParseSink
     void preallocateContents(uint64_t size) override
     {
         expectedSize = size;
-        hashSink = std::make_unique<HashSink>(htSHA256);
+        hashSink = std::make_unique<HashSink>(HashAlgorithm::SHA256);
     }
 
     void receiveContents(std::string_view data) override
diff --git a/src/hydra-queue-runner/queue-monitor.cc b/src/hydra-queue-runner/queue-monitor.cc
index 6c339af6..3ce9bba2 100644
--- a/src/hydra-queue-runner/queue-monitor.cc
+++ b/src/hydra-queue-runner/queue-monitor.cc
@@ -677,7 +677,7 @@ BuildOutput State::getBuildOutputCached(Connection & conn, nix::ref<nix::Store>
                 product.fileSize = row[2].as<off_t>();
             }
             if (!row[3].is_null())
-                product.sha256hash = Hash::parseAny(row[3].as<std::string>(), htSHA256);
+                product.sha256hash = Hash::parseAny(row[3].as<std::string>(), HashAlgorithm::SHA256);
             if (!row[4].is_null())
                 product.path = row[4].as<std::string>();
             product.name = row[5].as<std::string>();