diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 91178d0..8435624 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,7 +40,11 @@ jobs:
         run: uv run ruff format --check hate_crack
 
       - name: Ty
-        run: uv run ty check hate_crack
+        # ty 0.0.63 fails CI on warning-level diagnostics by default;
+        # keep the pre-0.0.63 behaviour of failing only on errors so the
+        # rules already downgraded to "warn" in [tool.ty.rules] stay
+        # non-blocking.
+        run: uv run ty check --exit-zero-on-warning hate_crack
 
       - name: Pytest
         env:
diff --git a/prek.toml b/prek.toml
index 9ce02d2..d19c5c8 100644
--- a/prek.toml
+++ b/prek.toml
@@ -22,7 +22,7 @@ always_run = true
 [[repos.hooks]]
 id = "ty"
 name = "ty"
-entry = "uv run ty check hate_crack"
+entry = "uv run ty check --exit-zero-on-warning hate_crack"
 language = "system"
 stages = ["pre-push"]
 pass_filenames = false
diff --git a/pyproject.toml b/pyproject.toml
index 2572ef4..0f245e7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -87,6 +87,13 @@ unresolved-import = "warn"
 # BeautifulSoup union types and module-level globals
 unresolved-attribute = "warn"
 invalid-argument-type = "warn"
+# ty 0.0.63 tightened these to error for the same legacy pattern
+# (module-level `hcatHashFile = None` etc. in main.py, later used as
+# strings). Downgrade to warn to match the rest.
+unsupported-operator = "warn"
+no-matching-overload = "warn"
+invalid-assignment = "warn"
+unresolved-global = "warn"
 
 [tool.pytest.ini_options]
 testpaths = [
@@ -95,7 +102,7 @@ testpaths = [
 
 [dependency-groups]
 dev = [
-    "ty==0.0.17",
+    "ty==0.0.63",
     "ruff==0.15.1",
     "pytest==9.0.3",
     "pytest-cov==7.1.0",