diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d69a6db..2ee6e2e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,10 @@ Status of the `main` branch. Changes prior to the next official version change w
 
 * Language Servers:
   - C/C++ (clangd): improve support and documentation for Unreal Engine 5 projects.
+  - HLSL (`shader-language-server`): pass `--locked` to `cargo install` when building from source
+    on macOS (and in the manual-install instructions), honoring the crate's packaged `Cargo.lock`.
+    Without it, fresh dependency resolution pulled in shader-sense 1.4.0, which no longer compiles
+    against the pinned shader_language_server 1.3.1, breaking the macOS CI job.
   - `typescript_vts`: Add `initialization_options` setting in `ls_specific_settings.typescript_vts`. 
     Enables Yarn PnP setups with `typescript.tsdk` pointing at the Yarn-generated SDK.
   - TypeScript/VTS: disable automatic typing acquisition during initialization (no network
diff --git a/src/solidlsp/language_servers/hlsl_language_server.py b/src/solidlsp/language_servers/hlsl_language_server.py
index 41b945ef..a41713eb 100644
--- a/src/solidlsp/language_servers/hlsl_language_server.py
+++ b/src/solidlsp/language_servers/hlsl_language_server.py
@@ -81,7 +81,7 @@ class HlslLanguageServer(SolidLanguageServer):
             base_url = f"{_GITHUB_RELEASE_BASE}/{tag}"
 
             # macOS has no pre-built binaries; build from source via cargo install
-            cargo_install_cmd = ["cargo", "install", "shader_language_server", "--version", version, "--root", "."]
+            cargo_install_cmd = ["cargo", "install", "shader_language_server", "--version", version, "--locked", "--root", "."]
 
             deps = RuntimeDependencyCollection(
                 [
@@ -141,7 +141,7 @@ class HlslLanguageServer(SolidLanguageServer):
                 raise FileNotFoundError(
                     "shader-language-server is not installed and no auto-install is available for your platform.\n"
                     "Please install it using one of the following methods:\n"
-                    "  cargo:   cargo install shader_language_server\n"
+                    "  cargo:   cargo install shader_language_server --locked\n"
                     "  GitHub:  Download from https://github.com/antaalt/shader-sense/releases\n"
                     "On macOS, install the Rust toolchain (https://rustup.rs) and Serena will build from source automatically.\n"
                     "See https://github.com/antaalt/shader-sense for more details."