diff --git a/modules/dependencies.nix b/modules/dependencies.nix
index 55e6d066..bd4c419f 100644
--- a/modules/dependencies.nix
+++ b/modules/dependencies.nix
@@ -140,6 +140,7 @@ in
       opencode.default = "opencode";
       plantuml.default = "plantuml";
       ripgrep.default = "ripgrep";
+      roslyn_ls.default = "roslyn-ls";
       rust-analyzer.default = "rust-analyzer";
       sd.default = "sd";
       sed.default = "gnused";
diff --git a/tests/test-sources/modules/dependencies.nix b/tests/test-sources/modules/dependencies.nix
index 0a8eabf6..37574a02 100644
--- a/tests/test-sources/modules/dependencies.nix
+++ b/tests/test-sources/modules/dependencies.nix
@@ -6,7 +6,12 @@
 let
   inherit (pkgs.stdenv) hostPlatform;
 
-  disabledDeps = [ ];
+  disabledDeps = [
+    # TODO: 2025-10-03
+    # Transient dependency `vmr` has a build failure
+    # https://github.com/NixOS/nixpkgs/issues/431811
+    "roslyn_ls"
+  ];
 
   isDepEnabled =
     name: package: