diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 426be29ce..e3ee82729 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -43,6 +43,41 @@ jobs:
       - name: Run unit tests
         run: uv run pytest tests/unit/ -v --tb=short
 
+  # ---------------------------------------------------------------------------
+  # tree-sitter floor — installs the declared minimum tree-sitter version and
+  # compiles every language's query against it. `uv sync` alone always
+  # resolves the newest tree-sitter, which is why #2165 (13 of 27 language
+  # queries failing to compile against tree-sitter 0.23.x/0.24.x, with each
+  # failure silently indexing the language at zero symbols) went uncaught.
+  # Deliberately narrow: only tree-sitter itself is pinned down to the floor,
+  # not `--resolution lowest-direct` for the whole dependency set, which
+  # would fail on unrelated loose floors elsewhere in this repo.
+  # ---------------------------------------------------------------------------
+  test-tree-sitter-floor:
+    name: tree-sitter floor (query compilation)
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+        with:
+          version: "latest"
+          enable-cache: true
+
+      - name: Install dependencies
+        run: uv sync --all-packages
+
+      - name: Pin tree-sitter to the declared floor
+        run: uv pip install "tree-sitter==0.25.0"
+
+      - name: Run query-compilation test
+        # --no-sync: plain `uv run` re-syncs the venv from uv.lock before
+        # running, which would silently reinstall the newest tree-sitter and
+        # undo the pin above.
+        run: uv run --no-sync pytest tests/unit/ingestion/parser/test_query_compilation.py -v --tb=short
+
   # ---------------------------------------------------------------------------
   # Python lint — ruff. Deliberately its own job rather than a step inside the
   # test matrix: the result is identical on 3.11/3.12/3.13 (target-version is
diff --git a/pyproject.toml b/pyproject.toml
index f75baaad0..4a23fc918 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ dependencies = [
     # HTTP client
     "httpx>=0.27,<1",
     # AST parsing
-    "tree-sitter>=0.23,<1",
+    "tree-sitter>=0.25,<1",
     "tree-sitter-python>=0.23,<1",
     "tree-sitter-typescript>=0.23,<1",
     "tree-sitter-javascript>=0.23,<1",
diff --git a/tests/unit/ingestion/parser/test_query_compilation.py b/tests/unit/ingestion/parser/test_query_compilation.py
new file mode 100644
index 000000000..be9067899
--- /dev/null
+++ b/tests/unit/ingestion/parser/test_query_compilation.py
@@ -0,0 +1,32 @@
+"""Every language's tree-sitter query must compile against its grammar.
+
+Regression test for #2165: with `tree-sitter` 0.23.x/0.24.x installed, 13 of
+the 27 language queries failed to compile (`Impossible pattern`), and
+`_load_compiled_query` swallows that failure and returns `None` — so every
+file in the affected languages silently indexed with zero symbols. This
+walks the full language registry, compiles each language's query directly,
+and asserts on the return value rather than expecting an exception, since
+that's exactly what production does.
+"""
+
+from __future__ import annotations
+
+import pytest
+
+from repowise.core.ingestion.languages.registry import REGISTRY
+from repowise.core.ingestion.parser import QUERIES_DIR, _load_compiled_query
+
+
+def _languages_with_queries() -> list[str]:
+    tags = []
+    for spec in REGISTRY.all_specs():
+        scm_name = spec.scm_file or f"{spec.tag}.scm"
+        if (QUERIES_DIR / scm_name).exists():
+            tags.append(spec.tag)
+    return sorted(tags)
+
+
+@pytest.mark.parametrize("lang", _languages_with_queries())
+def test_query_compiles(lang: str) -> None:
+    query = _load_compiled_query(lang)
+    assert query is not None, f"{lang}: query failed to compile against its grammar"
diff --git a/uv.lock b/uv.lock
index 50c57980d..96babc726 100644
--- a/uv.lock
+++ b/uv.lock
@@ -3179,7 +3179,7 @@ requires-dist = [
     { name = "structlog", specifier = ">=24,<25" },
     { name = "tenacity", specifier = ">=9,<10" },
     { name = "time-machine", marker = "extra == 'dev'", specifier = ">=2.14,<3" },
-    { name = "tree-sitter", specifier = ">=0.23,<1" },
+    { name = "tree-sitter", specifier = ">=0.25,<1" },
     { name = "tree-sitter-bash", specifier = ">=0.23,<1" },
     { name = "tree-sitter-c-sharp", specifier = ">=0.23,<1" },
     { name = "tree-sitter-cpp", specifier = ">=0.23,<1" },