diff --git a/tests/all-package-defaults.nix b/tests/all-package-defaults.nix
index cf8b07ff..d64b2886 100644
--- a/tests/all-package-defaults.nix
+++ b/tests/all-package-defaults.nix
@@ -13,6 +13,11 @@ let
   };
 
   disabledTests = [
+    # TODO: 2025-10-03
+    # Transient dependency `vmr` has a build failure
+    # https://github.com/NixOS/nixpkgs/issues/431811
+    "roslyn-ls"
+
     # 2025-07-25 python313Packages.lsp-tree-sitter is marked as broken
     "autotools-language-server"
 
diff --git a/tests/lsp-servers.nix b/tests/lsp-servers.nix
index e6348f9e..cec33dc1 100644
--- a/tests/lsp-servers.nix
+++ b/tests/lsp-servers.nix
@@ -37,6 +37,11 @@ let
     let
 
       disabled = [
+        # TODO: 2025-10-03
+        # Transient dependency `vmr` has a build failure
+        # https://github.com/NixOS/nixpkgs/issues/431811
+        "roslyn_ls"
+
         # TODO: 2025-07-25 python313Packages.lsp-tree-sitter marked as broken
         "autotools_ls"