diff --git a/.github/workflows/latest_deps.yml b/.github/workflows/latest_deps.yml
index c537a5a60..1a61d179d 100644
--- a/.github/workflows/latest_deps.yml
+++ b/.github/workflows/latest_deps.yml
@@ -32,15 +32,12 @@ jobs:
         with:
           python-version: "3.x"
           poetry-version: "1.2.0b1"
-          extras: "all"
       # Dump installed versions for debugging.
       - run: poetry run pip list > before.txt
       # Upgrade all runtime dependencies only. This is intended to mimic a fresh
       # `pip install matrix-synapse[all]` as closely as possible.
       - run: poetry update --no-dev
       - run: poetry run pip list > after.txt && (diff -u before.txt after.txt || true)
-      - name: Remove warn_unused_ignores from mypy config
-        run: sed '/warn_unused_ignores = True/d' -i mypy.ini
       - run: poetry run mypy
   trial:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/twisted_trunk.yml b/.github/workflows/twisted_trunk.yml
index 5f0671f35..8fc1affb7 100644
--- a/.github/workflows/twisted_trunk.yml
+++ b/.github/workflows/twisted_trunk.yml
@@ -24,8 +24,6 @@ jobs:
           poetry remove twisted
           poetry add --extras tls git+https://github.com/twisted/twisted.git#trunk
           poetry install --no-interaction --extras "all test"
-      - name: Remove warn_unused_ignores from mypy config
-        run: sed '/warn_unused_ignores = True/d' -i mypy.ini
       - run: poetry run mypy
 
   trial:
diff --git a/changelog.d/12576.misc b/changelog.d/12576.misc
deleted file mode 100644
index 71022c863..000000000
--- a/changelog.d/12576.misc
+++ /dev/null
@@ -1 +0,0 @@
-Allow unused `#type: ignore` comments in bleeding edge CI jobs.