diff --git a/ci/Dockerfile b/ci/Dockerfile
index cd548ed..c4aed56 100644
--- a/ci/Dockerfile
+++ b/ci/Dockerfile
@@ -10,6 +10,7 @@ RUN pacman -S --noconfirm \
     clang \
     lld \
     nodejs \
+    tree-sitter \
     cmark-gfm \
     git