diff --git a/.github/workflows/sync-from-nns-core.yml b/.github/workflows/sync-from-nns-core.yml
index 809bd6b7..a9d68308 100644
--- a/.github/workflows/sync-from-nns-core.yml
+++ b/.github/workflows/sync-from-nns-core.yml
@@ -106,7 +106,7 @@ jobs:
           fi
 
       - name: Run ruff
-        run: ruff check .
+        run: ruff check . --exclude extern/NNS-core --exclude upstream
 
       - name: Run mypy
         run: mypy
diff --git a/pyproject.toml b/pyproject.toml
index 7d1b3376..09df3b3f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -79,7 +79,11 @@ markers = [
 [tool.ruff]
 line-length = 100
 target-version = "py311"
-extend-exclude = ["*.ipynb"]
+extend-exclude = [
+    "*.ipynb",
+    "extern/NNS-core",
+    "upstream",
+]
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "B", "UP", "N", "RUF", "TID"]