diff --git a/cabal.project b/cabal.project
index df38c76543..4c37470710 100644
--- a/cabal.project
+++ b/cabal.project
@@ -6,6 +6,14 @@ packages:
          ./hls-plugin-api
          ./hls-test-utils
 
+-- Use the lsp-types change from haskell/lsp#630 until it lands upstream.
+source-repository-package
+  type: git
+  location: https://github.com/sjakobi/lsp.git
+  tag: 68d3eab658849acd9dc27a8104584e76b17c9472
+  subdir:
+    lsp-types
+
 index-state: 2026-02-24T00:00:00Z
 
 tests: True