diff --git a/.github/workflows/dotnet.yaml b/.github/workflows/dotnet.yaml
index 3693be6..5a8608b 100644
--- a/.github/workflows/dotnet.yaml
+++ b/.github/workflows/dotnet.yaml
@@ -38,14 +38,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Setup .NET
-        uses: actions/setup-dotnet@v3
-        with:
-          dotnet-version: 7.0.x
+      - name: Install Nix
+        uses: cachix/install-nix-action@v17
+      - name: Build
+        run: nix build
       - name: Run app
-        run: dotnet run --project AdventOfCode2022.App/AdventOfCode2022.App.fsproj --configuration Release
+        run: ./result/bin/AdventOfCode2022.App
 
-  check-format:
+  check-dotnet-format:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -59,13 +59,26 @@ jobs:
       - name: Run Fantomas
         run: ./hooks/pre-push
 
+  check-nix-format:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - uses: actions/checkout@v3
+      - name: Install Nix
+        uses: cachix/install-nix-action@v17
+      - name: Run Alejandra
+        run: nix develop --command alejandra --check .
+
   shellcheck:
     name: Shellcheck
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - name: Install Nix
+        uses: cachix/install-nix-action@v17
       - name: Run ShellCheck
-        uses: ludeeus/action-shellcheck@master
+        run: nix shell 'nixpkgs#shellcheck' --command bash -c "find . -type f -name '*.sh' | xargs shellcheck"
 
   linkcheck:
     name: Check links
@@ -76,7 +89,7 @@ jobs:
         name: Run link checker
 
   all-required-checks-complete:
-    needs: [check-format, build, shellcheck, linkcheck, run-app]
+    needs: [check-dotnet-format, check-nix-format, build, shellcheck, linkcheck, run-app]
     runs-on: ubuntu-latest
     steps:
       - run: echo "All required checks complete."
diff --git a/Directory.Build.props b/Directory.Build.props
index c1de8c2..781edd7 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,5 +1,4 @@
 <Project>
-  <Sdk Name="DotNet.ReproducibleBuilds.Isolated" Version="1.1.1" />
   <PropertyGroup>
     <Authors>Patrick Stevens</Authors>
     <Copyright>Patrick Stevens</Copyright>
diff --git a/deps.nix b/deps.nix
new file mode 100644
index 0000000..3e2ba5e
--- /dev/null
+++ b/deps.nix
@@ -0,0 +1,574 @@
+# This file was automatically generated by passthru.fetch-deps.
+# Please don't edit it manually, your changes might get overwritten!
+{fetchNuGet}: [
+  (fetchNuGet {
+    pname = "BenchmarkDotNet";
+    version = "0.13.2";
+    sha256 = "197dn76za0dvpa1gv819m9qrhri1ppcmvgd7qgc6kmqwcrqrzwx4";
+  })
+  (fetchNuGet {
+    pname = "BenchmarkDotNet.Annotations";
+    version = "0.13.2";
+    sha256 = "05r2jv4z5awwd3c9ih3f0zkyh24k5hh9fa54r2d2bgj0g4fiwrq1";
+  })
+  (fetchNuGet {
+    pname = "CommandLineParser";
+    version = "2.4.3";
+    sha256 = "1aca3q25n3dg55v4j3kzlzfzd5k2jpy6zhp8x7g74pdfdqzrhg55";
+  })
+  (fetchNuGet {
+    pname = "coverlet.collector";
+    version = "3.1.2";
+    sha256 = "0gsk2q93qw7pqxwd4pdyq5364wz0lvldcqqnf4amz13jaq86idmz";
+  })
+  (fetchNuGet {
+    pname = "DotNet.ReproducibleBuilds";
+    version = "1.1.1";
+    sha256 = "0wa0xwbwv1lzjmqwg1vq06vrpb9kkbv3xw5nq50savj0dzhqakzq";
+  })
+  (fetchNuGet {
+    pname = "FSharp.Collections.ParallelSeq";
+    version = "1.2.0";
+    sha256 = "0nsji0w089fhs6xa6m7w8r8zqdi3gm29nzpl386kk5r1vfrw3zfv";
+  })
+  (fetchNuGet {
+    pname = "FSharp.Core";
+    version = "7.0.0";
+    sha256 = "1pgk3qk9p1s53wvja17744x4bf7zs3a3wf0dmxi66w1w06z7i85x";
+  })
+  (fetchNuGet {
+    pname = "FsUnit";
+    version = "5.1.0";
+    sha256 = "07pc3qba6b7ljsdgxhjn5lx6jvzqx5rc20aibhpm1m195kmq097l";
+  })
+  (fetchNuGet {
+    pname = "Iced";
+    version = "1.17.0";
+    sha256 = "1999xavgpy2h83rh4indiq5mx5l509swqdi1raxj3ab6zvk49zpb";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Bcl.AsyncInterfaces";
+    version = "1.1.0";
+    sha256 = "1dq5yw7cy6s42193yl4iqscfw5vzkjkgv0zyy32scr4jza6ni1a1";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Build.Tasks.Git";
+    version = "1.1.1";
+    sha256 = "1bb5p4zlnfn88skkvymxfsn0jybqncl4356hwnic9jxdq2d4fz1w";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.CodeAnalysis.Analyzers";
+    version = "2.6.2-beta2";
+    sha256 = "152b2v012mpac5yjcwij4ja8lgmqfiwhcvnbhmqi00wp2jimqsc5";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.CodeAnalysis.Common";
+    version = "3.0.0";
+    sha256 = "0q6v1z0zy33x8bx20dxpm8s6ikdykz32zyy1zf4dzknqsl451imr";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.CodeAnalysis.CSharp";
+    version = "3.0.0";
+    sha256 = "1dbbh3pwq3qycmr7xisyhl5ik6fl3sanpacwyf1c1j0xdva56g91";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.CodeCoverage";
+    version = "17.1.0";
+    sha256 = "1ijl3w14lnj15hi052jlshf5k8vb90x0py7yrs897mf126qp8ivy";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.CSharp";
+    version = "4.0.1";
+    sha256 = "0zxc0apx1gcx361jlq8smc9pfdgmyjh6hpka8dypc9w23nlsh6yj";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Diagnostics.NETCore.Client";
+    version = "0.2.251802";
+    sha256 = "0h4mc6gx95l1mwcxhj7m7drsfgbhp0ssr6l8wr7k42y0nypgi4gm";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Diagnostics.Runtime";
+    version = "2.2.332302";
+    sha256 = "1n64ya4fq6305xv8ybk7f22v0f39rylkqap7n9blhr1h98mp27z5";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Diagnostics.Tracing.TraceEvent";
+    version = "3.0.2";
+    sha256 = "14swfz2myqv4zxznf5450b3485q629pk0zc483yszvq0956a4yq4";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.DotNet.PlatformAbstractions";
+    version = "3.1.6";
+    sha256 = "0b9myd7gqbpaw9pkd2bx45jhik9mwj0f1ss57sk2cxmag2lkdws5";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Extensions.Configuration";
+    version = "2.1.1";
+    sha256 = "0244czr3jflvzcj6axq61j10dkl0f16ad34rw81ryg57v4cvlwx6";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Extensions.Configuration.Abstractions";
+    version = "2.1.1";
+    sha256 = "0b4bn0cf39c6jlc8xnpi1d8f3pz0qhf8ng440yb95y5jv5q4fdyw";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Extensions.Configuration.Binder";
+    version = "2.1.1";
+    sha256 = "0n91s6cjfv8plf5swhr307s849jmq2pa3i1rbpb0cb0grxml0mqm";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Extensions.DependencyInjection.Abstractions";
+    version = "2.1.1";
+    sha256 = "0rn0925aqm1fsbaf0n8jy6ng2fm1cy97lp7yikvx31m6178k9i84";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Extensions.Logging";
+    version = "2.1.1";
+    sha256 = "12pag6rf01xfa8x1h30mf4czfhlhg2kgi5q712jicy3h12c02w8y";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Extensions.Logging.Abstractions";
+    version = "2.1.1";
+    sha256 = "1sgpwj0sa0ac7m5fnkb482mnch8fsv8hfbvk53c6lyh47s1xhdjg";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.Extensions.Options";
+    version = "2.1.1";
+    sha256 = "0wgpsi874gzzjj099xbdmmsifslkbdjkxd5xrzpc5xdglpkw08vl";
+  })
+  (fetchNuGet {
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+    version = "2.1.1";
+    sha256 = "033rkqdffybq5prhc7nn6v68zij393n00s5a82yf2n86whwvdfwx";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NET.Test.Sdk";
+    version = "17.1.0";
+    sha256 = "1jaq11fhcfiylnn6wvbp2k9hrgq4cz755sfqjqjqcdxlkiyj2dkw";
+  })
+  (fetchNuGet {
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+    version = "1.0.1";
+    sha256 = "01al6cfxp68dscl15z7rxfw9zvhm64dncsw09a1vmdkacsa2v6lr";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.Platforms";
+    version = "1.1.0";
+    sha256 = "08vh1r12g6ykjygq5d3vq09zylgb84l63k49jc4v8faw9g93iqqm";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.Platforms";
+    version = "2.0.0";
+    sha256 = "1fk2fk2639i7nzy58m9dvpdnzql4vb8yl8vr19r2fp8lmj9w2jr0";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.Targets";
+    version = "1.0.1";
+    sha256 = "0ppdkwy6s9p7x9jix3v4402wb171cdiibq7js7i13nxpdky7074p";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.SourceLink.AzureRepos.Git";
+    version = "1.1.1";
+    sha256 = "059c8i2vybprn63sw2jr7xma4yyl2syx6hzygfdpr0zd5jlgy9rz";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.SourceLink.Bitbucket.Git";
+    version = "1.1.1";
+    sha256 = "1p7di7lihraqisd4yfslvhpwlb9zf2casssjhyad1a0hcqmgw7n9";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.SourceLink.Common";
+    version = "1.1.1";
+    sha256 = "0xkdqs7az2cprar7jzjlgjpd64l6f8ixcmwmpkdm03fyb4s5m0bg";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.SourceLink.GitHub";
+    version = "1.1.1";
+    sha256 = "099y35f2npvva3jk1zp8hn0vb9pwm2l0ivjasdly6y2idv53s5yy";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.SourceLink.GitLab";
+    version = "1.1.1";
+    sha256 = "0fm50cc05fmkz77xnl6qvawkx43asdklzxhz65jnbkjp633zvx41";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.TestPlatform.ObjectModel";
+    version = "17.1.0";
+    sha256 = "0jw577vbrplv9kga22lsipz91ww9iqi6j1wgpwga0vrayhggjsk2";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.TestPlatform.TestHost";
+    version = "17.1.0";
+    sha256 = "0j9i078hv4qqrg2433p20pykmcjvmzarc1cy1k5f7kc7739q6vx5";
+  })
+  (fetchNuGet {
+    pname = "NETStandard.Library";
+    version = "2.0.0";
+    sha256 = "1bc4ba8ahgk15m8k4nd7x406nhi0kwqzbgjk2dmw52ss553xz7iy";
+  })
+  (fetchNuGet {
+    pname = "Newtonsoft.Json";
+    version = "9.0.1";
+    sha256 = "0mcy0i7pnfpqm4pcaiyzzji4g0c8i3a5gjz28rrr28110np8304r";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Frameworks";
+    version = "5.11.0";
+    sha256 = "0wv26gq39hfqw9md32amr5771s73f5zn1z9vs4y77cgynxr73s4z";
+  })
+  (fetchNuGet {
+    pname = "NUnit";
+    version = "3.13.3";
+    sha256 = "0wdzfkygqnr73s6lpxg5b1pwaqz9f414fxpvpdmf72bvh4jaqzv6";
+  })
+  (fetchNuGet {
+    pname = "NUnit.Analyzers";
+    version = "3.3.0";
+    sha256 = "00wp5q361f845aywrhhfbrpwd2srgygiam30pvn846b5dbl41vy0";
+  })
+  (fetchNuGet {
+    pname = "NUnit3TestAdapter";
+    version = "4.2.1";
+    sha256 = "0gildh4xcb6gkxcrrgh5a1j7lq0a7l670jpbs71akl5b5bgy5gc3";
+  })
+  (fetchNuGet {
+    pname = "Perfolizer";
+    version = "0.2.1";
+    sha256 = "012aqqi3y3nfikqmn26yajpwd52c04zlzp0p91iyslw7mf26qncy";
+  })
+  (fetchNuGet {
+    pname = "runtime.any.System.Collections";
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+    sha256 = "1x44bm1cgv28zmrp095wf9mn8a6a0ivnzp9v14dcbhx06igxzgg0";
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+  (fetchNuGet {
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+    sha256 = "0qcpm90hrm9gx9pmxlvfml65jm0bwpr5dg3r7l7xm9nvmibvc7n7";
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+  (fetchNuGet {
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+    sha256 = "0240rp66pi5bw1xklmh421hj7arwcdmjmgfkiq1cbc6nrm8ah286";
+  })
+  (fetchNuGet {
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+    sha256 = "0kasfkjiml2kk8prnyn1990nhsahnjggvqwszqjdsfwfl43vpcb5";
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+  (fetchNuGet {
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+    sha256 = "06kcs059d5czyakx75rvlwa2mr86156w18fs7chd03f7084l7mq6";
+  })
+  (fetchNuGet {
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+    sha256 = "05k34ijz9g9csh0vbbv3g3lrxl163izwcfncmbcl7k073h32rzkr";
+  })
+  (fetchNuGet {
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+    sha256 = "1zxrpvixr5fqzkxpnin6g6gjq6xajy1snghz99ds2dwbhm276rhz";
+  })
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+    sha256 = "1kswgqhy34qvc49i981fk711s7knd6z13bp0rin8ms6axkh98nas";
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+    sha256 = "0d1rxxpvg9v7wlibsfgz0r4hwigpadas822qf8m8fs1gma9gs877";
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+    sha256 = "1qzdp09qs8br5qxzlm1lgbjn4n57fk8vr1lzrmli2ysdg6x1xzvk";
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+    sha256 = "05ndbai4vpqrry0ghbfgqc8xblmplwjgndxmdn1zklqimczwjg2d";
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+    sha256 = "02wnlydnbhai0zy7c3kihg0cis0l1b2z78kyi1ci47c5v0jklwha";
+  })
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+    sha256 = "0ic5dgc45jkhcr1g9xmmzjm7ffiw4cymm0fprczlx4fnww4783nm";
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+  (fetchNuGet {
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+    sha256 = "0x1cwd7cvifzmn5x1wafvj75zdxlk3mxy860igh3x1wx0s8167y4";
+  })
+  (fetchNuGet {
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+    sha256 = "1i55cxp8ycc03dmxx4n22qi6jkwfl23cgffb95izq7bjar8avxxq";
+  })
+  (fetchNuGet {
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+    sha256 = "1ga40f5lrwldiyw6vy67d0sg7jd7ww6kgwbksm19wrvq9hr0bsm6";
+  })
+  (fetchNuGet {
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+    sha256 = "1d5gjn5afnrf461jlxzawcvihz195gayqpcfbv6dd7pxa9ialn06";
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+    version = "5.0.0";
+    sha256 = "1kvcllagxz2q92g81zkz81djkn2lid25ayjfgjalncyc68i15p0r";
+  })
+  (fetchNuGet {
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+    sha256 = "0gmjghrqmlgzxivd2xl50ncbglb7ljzb66rlx8ws6dv8jm0d5siz";
+  })
+  (fetchNuGet {
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+    sha256 = "19cknvg07yhakcvpxg3cxa0bwadplin6kyxd8mpjjpwnp56nl85x";
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+  (fetchNuGet {
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+    sha256 = "070c5jbas2v7smm660zaf1gh0489xanjqymkvafcs4f8cdrs1d5d";
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+  (fetchNuGet {
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+  (fetchNuGet {
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+  (fetchNuGet {
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+    sha256 = "1gpdxl6ip06cnab7n3zlcg6mqp7kknf73s8wjinzi4p0apw82fpg";
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+  (fetchNuGet {
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+  })
+  (fetchNuGet {
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+  })
+  (fetchNuGet {
+    pname = "System.Memory";
+    version = "4.5.3";
+    sha256 = "0naqahm3wljxb5a911d37mwjqjdxv9l0b49p5dmfyijvni2ppy8a";
+  })
+  (fetchNuGet {
+    pname = "System.ObjectModel";
+    version = "4.0.12";
+    sha256 = "1sybkfi60a4588xn34nd9a58png36i0xr4y4v4kqpg8wlvy5krrj";
+  })
+  (fetchNuGet {
+    pname = "System.Private.Uri";
+    version = "4.0.1";
+    sha256 = "0k57qhawjysm4cpbfpc49kl4av7lji310kjcamkl23bwgij5ld9j";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection";
+    version = "4.1.0";
+    sha256 = "1js89429pfw79mxvbzp8p3q93il6rdff332hddhzi5wqglc4gml9";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Emit";
+    version = "4.0.1";
+    sha256 = "0ydqcsvh6smi41gyaakglnv252625hf29f7kywy2c70nhii2ylqp";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Emit";
+    version = "4.7.0";
+    sha256 = "121l1z2ypwg02yz84dy6gr82phpys0njk7yask3sihgy214w43qp";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Emit.ILGeneration";
+    version = "4.0.1";
+    sha256 = "1pcd2ig6bg144y10w7yxgc9d22r7c7ww7qn1frdfwgxr24j9wvv0";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Emit.Lightweight";
+    version = "4.0.1";
+    sha256 = "1s4b043zdbx9k39lfhvsk68msv1nxbidhkq6nbm27q7sf8xcsnxr";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Emit.Lightweight";
+    version = "4.7.0";
+    sha256 = "0mbjfajmafkca47zr8v36brvknzks5a7pgb49kfq2d188pyv6iap";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Extensions";
+    version = "4.0.1";
+    sha256 = "0m7wqwq0zqq9gbpiqvgk3sr92cbrw7cp3xn53xvw7zj6rz6fdirn";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Metadata";
+    version = "1.6.0";
+    sha256 = "1wdbavrrkajy7qbdblpbpbalbdl48q3h34cchz24gvdgyrlf15r4";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Primitives";
+    version = "4.0.1";
+    sha256 = "1bangaabhsl4k9fg8khn83wm6yial8ik1sza7401621jc6jrym28";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.TypeExtensions";
+    version = "4.1.0";
+    sha256 = "1bjli8a7sc7jlxqgcagl9nh8axzfl11f4ld3rjqsyxc516iijij7";
+  })
+  (fetchNuGet {
+    pname = "System.Resources.ResourceManager";
+    version = "4.0.1";
+    sha256 = "0b4i7mncaf8cnai85jv3wnw6hps140cxz8vylv2bik6wyzgvz7bi";
+  })
+  (fetchNuGet {
+    pname = "System.Runtime";
+    version = "4.1.0";
+    sha256 = "02hdkgk13rvsd6r9yafbwzss8kr55wnj8d5c7xjnp8gqrwc8sn0m";
+  })
+  (fetchNuGet {
+    pname = "System.Runtime.CompilerServices.Unsafe";
+    version = "4.5.0";
+    sha256 = "17labczwqk3jng3kkky73m0jhi8wc21vbl7cz5c0hj2p1dswin43";
+  })
+  (fetchNuGet {
+    pname = "System.Runtime.CompilerServices.Unsafe";
+    version = "4.5.3";
+    sha256 = "1afi6s2r1mh1kygbjmfba6l4f87pi5sg13p4a48idqafli94qxln";
+  })
+  (fetchNuGet {
+    pname = "System.Runtime.CompilerServices.Unsafe";
+    version = "5.0.0";
+    sha256 = "02k25ivn50dmqx5jn8hawwmz24yf0454fjd823qk6lygj9513q4x";
+  })
+  (fetchNuGet {
+    pname = "System.Runtime.Extensions";
+    version = "4.1.0";
+    sha256 = "0rw4rm4vsm3h3szxp9iijc3ksyviwsv6f63dng3vhqyg4vjdkc2z";
+  })
+  (fetchNuGet {
+    pname = "System.Runtime.Handles";
+    version = "4.0.1";
+    sha256 = "1g0zrdi5508v49pfm3iii2hn6nm00bgvfpjq1zxknfjrxxa20r4g";
+  })
+  (fetchNuGet {
+    pname = "System.Runtime.InteropServices";
+    version = "4.1.0";
+    sha256 = "01kxqppx3dr3b6b286xafqilv4s2n0gqvfgzfd4z943ga9i81is1";
+  })
+  (fetchNuGet {
+    pname = "System.Runtime.Serialization.Primitives";
+    version = "4.1.1";
+    sha256 = "042rfjixknlr6r10vx2pgf56yming8lkjikamg3g4v29ikk78h7k";
+  })
+  (fetchNuGet {
+    pname = "System.Text.Encoding";
+    version = "4.0.11";
+    sha256 = "1dyqv0hijg265dwxg6l7aiv74102d6xjiwplh2ar1ly6xfaa4iiw";
+  })
+  (fetchNuGet {
+    pname = "System.Text.Encoding.CodePages";
+    version = "4.5.0";
+    sha256 = "19x38911pawq4mrxrm04l2bnxwxxlzq8v8rj4cbxnfjj8pnd3vj3";
+  })
+  (fetchNuGet {
+    pname = "System.Text.Encoding.Extensions";
+    version = "4.0.11";
+    sha256 = "08nsfrpiwsg9x5ml4xyl3zyvjfdi4mvbqf93kjdh11j4fwkznizs";
+  })
+  (fetchNuGet {
+    pname = "System.Text.RegularExpressions";
+    version = "4.1.0";
+    sha256 = "1mw7vfkkyd04yn2fbhm38msk7dz2xwvib14ygjsb8dq2lcvr18y7";
+  })
+  (fetchNuGet {
+    pname = "System.Threading";
+    version = "4.0.11";
+    sha256 = "19x946h926bzvbsgj28csn46gak2crv2skpwsx80hbgazmkgb1ls";
+  })
+  (fetchNuGet {
+    pname = "System.Threading.Tasks";
+    version = "4.0.11";
+    sha256 = "0nr1r41rak82qfa5m0lhk9mp0k93bvfd7bbd9sdzwx9mb36g28p5";
+  })
+  (fetchNuGet {
+    pname = "System.Threading.Tasks.Extensions";
+    version = "4.0.0";
+    sha256 = "1cb51z062mvc2i8blpzmpn9d9mm4y307xrwi65di8ri18cz5r1zr";
+  })
+  (fetchNuGet {
+    pname = "System.Threading.Tasks.Extensions";
+    version = "4.5.4";
+    sha256 = "0y6ncasgfcgnjrhynaf0lwpkpkmv4a07sswwkwbwb5h7riisj153";
+  })
+  (fetchNuGet {
+    pname = "System.Xml.ReaderWriter";
+    version = "4.0.11";
+    sha256 = "0c6ky1jk5ada9m94wcadih98l6k1fvf6vi7vhn1msjixaha419l5";
+  })
+  (fetchNuGet {
+    pname = "System.Xml.XDocument";
+    version = "4.0.11";
+    sha256 = "0n4lvpqzy9kc7qy1a4acwwd7b7pnvygv895az5640idl2y9zbz18";
+  })
+]
diff --git a/fetchDeps.sh b/fetchDeps.sh
new file mode 100644
index 0000000..4f4583f
--- /dev/null
+++ b/fetchDeps.sh
@@ -0,0 +1,73 @@
+#!/bin/bash
+
+# This file was adapted from
+# https://github.com/NixOS/nixpkgs/blob/b981d811453ab84fb3ea593a9b33b960f1ab9147/pkgs/build-support/dotnet/build-dotnet-module/default.nix#L173
+set -euo pipefail
+export PATH="@binPath@"
+for arg in "$@"; do
+    case "$arg" in
+        --keep-sources|-k)
+            keepSources=1
+            shift
+            ;;
+        --help|-h)
+            echo "usage: $0 [--keep-sources] [--help] <output path>"
+            echo "    <output path>   The path to write the lockfile to. A temporary file is used if this is not set"
+            echo "    --keep-sources  Don't remove temporary directories upon exit, useful for debugging"
+            echo "    --help          Show this help message"
+            exit
+            ;;
+    esac
+done
+tmp=$(mktemp -td "@pname@-tmp-XXXXXX")
+export tmp
+HOME=$tmp/home
+exitTrap() {
+    test -n "${ranTrap-}" && return
+    ranTrap=1
+    if test -n "${keepSources-}"; then
+        echo -e "Path to the source: $tmp/src\nPath to the fake home: $tmp/home"
+    else
+        rm -rf "$tmp"
+    fi
+    # Since mktemp is used this will be empty if the script didnt succesfully complete
+    if ! test -s "$depsFile"; then
+      rm -rf "$depsFile"
+    fi
+}
+trap exitTrap EXIT INT TERM
+dotnetRestore() {
+    local -r project="${1-}"
+    local -r rid="$2"
+    dotnet restore "${project-}" \
+        -p:ContinuousIntegrationBuild=true \
+        -p:Deterministic=true \
+        --packages "$tmp/nuget_pkgs" \
+        --runtime "$rid" \
+        --no-cache \
+        --force
+}
+declare -a projectFiles=( @projectFiles@ )
+declare -a testProjectFiles=( @testProjectFiles@ )
+export DOTNET_NOLOGO=1
+export DOTNET_CLI_TELEMETRY_OPTOUT=1
+depsFile=$(realpath "${1:-$(mktemp -t "@pname@-deps-XXXXXX.nix")}")
+mkdir -p "$tmp/nuget_pkgs"
+storeSrc="@storeSrc@"
+src="$tmp/src"
+cp -rT "$storeSrc" "$src"
+chmod -R +w "$src"
+cd "$src"
+echo "Restoring project..."
+rids=(@rids@)
+for rid in "${rids[@]}"; do
+    (( ${#projectFiles[@]} == 0 )) && dotnetRestore "" "$rid"
+    for project in "${projectFiles[@]-}" "${testProjectFiles[@]-}"; do
+        dotnetRestore "$project" "$rid"
+    done
+done
+echo "Successfully restored project"
+echo "Writing lockfile..."
+echo -e "# This file was automatically generated by passthru.fetch-deps.\n# Please don't edit it manually, your changes might get overwritten!\n" > "$depsFile"
+nuget-to-nix "$tmp/nuget_pkgs" "@packages@" >> "$depsFile"
+echo "Successfully wrote lockfile to $depsFile"
diff --git a/flake.lock b/flake.lock
index c824d51..64315a4 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,50 +1,5 @@
 {
   "nodes": {
-    "alejandra": {
-      "inputs": {
-        "fenix": "fenix",
-        "flakeCompat": "flakeCompat",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1660510326,
-        "narHash": "sha256-xFumnivtVwu5fFBOrTxrv6fv3geHKF04RGP23EsDVaI=",
-        "owner": "kamadorueda",
-        "repo": "alejandra",
-        "rev": "ef03f7ef74ec97fd91a016a51c9c9667fb315652",
-        "type": "github"
-      },
-      "original": {
-        "owner": "kamadorueda",
-        "ref": "3.0.0",
-        "repo": "alejandra",
-        "type": "github"
-      }
-    },
-    "fenix": {
-      "inputs": {
-        "nixpkgs": [
-          "alejandra",
-          "nixpkgs"
-        ],
-        "rust-analyzer-src": "rust-analyzer-src"
-      },
-      "locked": {
-        "lastModified": 1657607339,
-        "narHash": "sha256-HaqoAwlbVVZH2n4P3jN2FFPMpVuhxDy1poNOR7kzODc=",
-        "owner": "nix-community",
-        "repo": "fenix",
-        "rev": "b814c83d9e6aa5a28d0cf356ecfdafb2505ad37d",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "fenix",
-        "type": "github"
-      }
-    },
     "flake-utils": {
       "locked": {
         "lastModified": 1667395993,
@@ -60,22 +15,6 @@
         "type": "github"
       }
     },
-    "flakeCompat": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1650374568,
-        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1671548329,
@@ -93,27 +32,9 @@
     },
     "root": {
       "inputs": {
-        "alejandra": "alejandra",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
-    },
-    "rust-analyzer-src": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1657557289,
-        "narHash": "sha256-PRW+nUwuqNTRAEa83SfX+7g+g8nQ+2MMbasQ9nt6+UM=",
-        "owner": "rust-lang",
-        "repo": "rust-analyzer",
-        "rev": "caf23f29144b371035b864a1017dbc32573ad56d",
-        "type": "github"
-      },
-      "original": {
-        "owner": "rust-lang",
-        "ref": "nightly",
-        "repo": "rust-analyzer",
-        "type": "github"
-      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index b2c91f1..9f3ab59 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,52 +4,52 @@
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
     nixpkgs.url = "nixpkgs/nixpkgs-unstable";
-    alejandra.url = "github:kamadorueda/alejandra/3.0.0";
-    alejandra.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   outputs = {
     self,
     nixpkgs,
-    alejandra,
     flake-utils,
     ...
   }:
     flake-utils.lib.eachDefaultSystem (system: let
       pkgs = nixpkgs.legacyPackages.${system};
       projectFile = "./AdventOfCode2022.App/AdventOfCode2022.App.fsproj";
+      testProjectFile = "./AdventOfCode2022.Test/AdventOfCode2022.Test.fsproj";
       pname = "AdventOfCode2022";
       outputFiles = [""];
       arrayToShell = a: toString (map (pkgs.lib.escape (pkgs.lib.stringToCharacters "\\ ';$`()|<>\t")) a);
+      dotnet-sdk = pkgs.dotnet-sdk_7;
+      version = "0.0.1";
     in {
       packages = {
-        default = pkgs.buildDotnetPackage {
+        fetchDeps = let
+          flags = [];
+          runtimeIds = map (system: pkgs.dotnetCorePackages.systemToDotnetRid system) dotnet-sdk.meta.platforms;
+        in
+          pkgs.writeShellScript "fetch-${pname}-deps" (builtins.readFile (pkgs.substituteAll {
+            src = ./fetchDeps.sh;
+            pname = pname;
+            binPath = pkgs.lib.makeBinPath [pkgs.coreutils dotnet-sdk (pkgs.nuget-to-nix.override {inherit dotnet-sdk;})];
+            projectFiles = toString (pkgs.lib.toList projectFile);
+            testProjectFiles = toString (pkgs.lib.toList testProjectFile);
+            rids = pkgs.lib.concatStringsSep "\" \"" runtimeIds;
+            packages = dotnet-sdk.packages;
+            storeSrc = pkgs.srcOnly {
+              src = ./.;
+              pname = pname;
+              version = version;
+            };
+          }));
+        default = pkgs.buildDotnetModule {
           pname = pname;
-          version = "0.0.1";
+          version = version;
           src = ./.;
           projectFile = projectFile;
-          buildInputs = [
-            pkgs.dotnet-sdk_7
-            # unit tests
-            pkgs.dotnetPackages.NUnit
-            pkgs.dotnetPackages.NUnitRunners
-          ];
-          outputFiles = outputFiles;
-          exeFiles = ["AdventOfCode2022.App"];
-          nativeBuildInputs = [
-            pkgs.pkg-config
-          ];
-          buildPhase = ''runHook preBuild && dotnet publish --configuration Release ${projectFile} && runHook postBuild'';
+          nugetDeps = ./deps.nix;
           doCheck = true;
-          checkPhase = ''runHook preCheck && dotnet test --configuration Debug && dotnet test --configuration Release && runHook postCheck'';
-          installPhase = builtins.readFile (pkgs.substituteAll {
-            src = ./install.sh;
-            outputFiles = arrayToShell outputFiles;
-            pname = pname;
-            dllPatterns = arrayToShell ["*.dll"];
-            dotnet = pkgs.dotnet-sdk_7;
-            exePattern = arrayToShell ["AdventOfCode2022.App"];
-          });
+          dotnet-sdk = pkgs.dotnet-sdk_7;
+          dotnet-runtime = pkgs.dotnetCorePackages.runtime_7_0;
         };
       };
       devShell = pkgs.mkShell {
@@ -61,7 +61,7 @@
             ])
         ];
         packages = [
-          alejandra.defaultPackage.${system}
+          pkgs.alejandra
         ];
       };
     });