diff --git a/pkgs/development/tools/omnisharp-roslyn/create-deps.sh b/pkgs/development/tools/omnisharp-roslyn/create-deps.sh
index 46cbb06951b0..c1b5da124733 100755
--- a/pkgs/development/tools/omnisharp-roslyn/create-deps.sh
+++ b/pkgs/development/tools/omnisharp-roslyn/create-deps.sh
@@ -1,13 +1,19 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -I nixpkgs=../../../../.. -i bash -p dotnet-sdk_6 jq xmlstarlet curl
+#!nix-shell -I nixpkgs=../../../.. -i bash -p dotnet-sdk_6 jq xmlstarlet curl
 set -euo pipefail
 
 cat << EOL
 { fetchurl }: [
 EOL
 
+# enter a temporary directory containing the source code, copied from the derivation
+srcdir="$(mktemp -d)"
+cp -r "$(nix-build -A omnisharp-roslyn.src ../../../..)"/. "$srcdir"
+rm -f "$srcdir"/global.json
+
+pushd $srcdir >&2
+
 tmpdir="$(mktemp -d -p "$(pwd)")" # must be under source root
-trap 'rm -rf "$tmpdir"' EXIT
 
 mapfile -t repos < <(
     xmlstarlet sel -t -v 'configuration/packageSources/add/@value' -n NuGet.Config |
@@ -20,7 +26,7 @@ mapfile -t repos < <(
 
 dotnet msbuild -t:restore -p:Configuration=Release -p:RestorePackagesPath="$tmpdir" \
         -p:RestoreNoCache=true -p:RestoreForce=true \
-        src/OmniSharp.Stdio.Driver/OmniSharp.Stdio.Driver.csproj >&2
+        "$srcdir/src/OmniSharp.Stdio.Driver/OmniSharp.Stdio.Driver.csproj" >&2
 
 cd "$tmpdir"
 for package in *
@@ -64,3 +70,5 @@ cd ..
 cat << EOL
 ]
 EOL
+
+popd >&2
diff --git a/pkgs/development/tools/omnisharp-roslyn/deps.nix b/pkgs/development/tools/omnisharp-roslyn/deps.nix
index 0d3bba7722b9..653194f5c859 100644
--- a/pkgs/development/tools/omnisharp-roslyn/deps.nix
+++ b/pkgs/development/tools/omnisharp-roslyn/deps.nix
@@ -65,26 +65,26 @@
   }
   {
     pname = "microsoft.aspnetcore.app.runtime.win-arm64";
-    version = "6.0.3";
+    version = "6.0.4";
     src = fetchurl {
-      url = "https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.app.runtime.win-arm64/6.0.3/microsoft.aspnetcore.app.runtime.win-arm64.6.0.3.nupkg";
-      sha256 = "0wxnwqg43hd1hk07j1wqhfrwbjm5ly7bsy9z2jgy9zf8lya4qs9a";
+      url = "https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.app.runtime.win-arm64/6.0.4/microsoft.aspnetcore.app.runtime.win-arm64.6.0.4.nupkg";
+      sha256 = "1sn2jlqzyiszrxscd3ah7sfvv065xc3vjky34qy81wdmyvxwhkba";
     };
   }
   {
     pname = "microsoft.aspnetcore.app.runtime.win-x64";
-    version = "6.0.3";
+    version = "6.0.4";
     src = fetchurl {
-      url = "https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.app.runtime.win-x64/6.0.3/microsoft.aspnetcore.app.runtime.win-x64.6.0.3.nupkg";
-      sha256 = "11kv50kll3iq88kn40f5v5qlq8mydv6y6xz2cbzjw4aadd44njwq";
+      url = "https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.app.runtime.win-x64/6.0.4/microsoft.aspnetcore.app.runtime.win-x64.6.0.4.nupkg";
+      sha256 = "1sqv7vhkm4j11rl7mfvs4mmmclcdps2n4pf31ck2mcx54nr4d2kj";
     };
   }
   {
     pname = "microsoft.aspnetcore.app.runtime.win-x86";
-    version = "6.0.3";
+    version = "6.0.4";
     src = fetchurl {
-      url = "https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.app.runtime.win-x86/6.0.3/microsoft.aspnetcore.app.runtime.win-x86.6.0.3.nupkg";
-      sha256 = "1c1qx840hwcp6a26dbx10f24pw9kzlvr15w3s1pakldygng5skwm";
+      url = "https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.app.runtime.win-x86/6.0.4/microsoft.aspnetcore.app.runtime.win-x86.6.0.4.nupkg";
+      sha256 = "0v7bpbl7bif1qlkdc0p10l69amf4vpzdd8bgz2455h6zxwjc1hy4";
     };
   }
   {
@@ -553,50 +553,50 @@
   }
   {
     pname = "microsoft.netcore.app.host.win-arm64";
-    version = "6.0.3";
+    version = "6.0.4";
     src = fetchurl {
-      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.host.win-arm64/6.0.3/microsoft.netcore.app.host.win-arm64.6.0.3.nupkg";
-      sha256 = "1dhdr3ccaag3yb803qswkm1zvvwc9q6m3d9nvxvb5f8m94rsbhka";
+      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.host.win-arm64/6.0.4/microsoft.netcore.app.host.win-arm64.6.0.4.nupkg";
+      sha256 = "1bnfb4yxdandddr36j5gkpaqym5pm971rp7gc8nkp3xmff4fnmc0";
     };
   }
   {
     pname = "microsoft.netcore.app.host.win-x64";
-    version = "6.0.3";
+    version = "6.0.4";
     src = fetchurl {
-      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.host.win-x64/6.0.3/microsoft.netcore.app.host.win-x64.6.0.3.nupkg";
-      sha256 = "1y428glba68s76icjzfl1v3p61pcz7rd78wybhabs8zq8w9cp2pj";
+      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.host.win-x64/6.0.4/microsoft.netcore.app.host.win-x64.6.0.4.nupkg";
+      sha256 = "1qasm6j25lmcc4xn7f7s3jli1pypz1kfnj7j9dkjlx9mc8r356zp";
     };
   }
   {
     pname = "microsoft.netcore.app.host.win-x86";
-    version = "6.0.3";
+    version = "6.0.4";
     src = fetchurl {
-      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.host.win-x86/6.0.3/microsoft.netcore.app.host.win-x86.6.0.3.nupkg";
-      sha256 = "0byyxiv8253zgymn0vwz8zxyasmhdwj891gxg3ydgnc2qf23f16g";
+      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.host.win-x86/6.0.4/microsoft.netcore.app.host.win-x86.6.0.4.nupkg";
+      sha256 = "16chkjf2fc2d4bd7wccxkgb5n44dpb6admchmg8mx3mlg0n24bwa";
     };
   }
   {
     pname = "microsoft.netcore.app.runtime.win-arm64";
-    version = "6.0.3";
+    version = "6.0.4";
     src = fetchurl {
-      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.runtime.win-arm64/6.0.3/microsoft.netcore.app.runtime.win-arm64.6.0.3.nupkg";
-      sha256 = "022kld62v6npxx27mvllg3nv7rpw142q49zwgprzvrxgnn5zszq1";
+      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.runtime.win-arm64/6.0.4/microsoft.netcore.app.runtime.win-arm64.6.0.4.nupkg";
+      sha256 = "1jcfajqq6i06w8a9n2r92f326x3v7avkiv31nsldzjdn1ikiwfzj";
     };
   }
   {
     pname = "microsoft.netcore.app.runtime.win-x64";
-    version = "6.0.3";
+    version = "6.0.4";
     src = fetchurl {
-      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.runtime.win-x64/6.0.3/microsoft.netcore.app.runtime.win-x64.6.0.3.nupkg";
-      sha256 = "1rjkzs2013razi2xs943q62ys1jh8blhjcnj75qkvirf859d11qw";
+      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.runtime.win-x64/6.0.4/microsoft.netcore.app.runtime.win-x64.6.0.4.nupkg";
+      sha256 = "1x4ysack9n57h8w1ybfyczkf3w6jsgz7ila0czm2011w4sjnyqj0";
     };
   }
   {
     pname = "microsoft.netcore.app.runtime.win-x86";
-    version = "6.0.3";
+    version = "6.0.4";
     src = fetchurl {
-      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.runtime.win-x86/6.0.3/microsoft.netcore.app.runtime.win-x86.6.0.3.nupkg";
-      sha256 = "0gsk9939f6vrqbgc7cw8g8q9c7669rkfwwlyhiq13piqmj2kni6g";
+      url = "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.runtime.win-x86/6.0.4/microsoft.netcore.app.runtime.win-x86.6.0.4.nupkg";
+      sha256 = "1ha2w6zh0l1kl36rxy9g38xcq8awhyqiiwi9gbr9kmxig5i5fxfa";
     };
   }
   {