diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 09561f9..fd00d90 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1,5 +1,2 @@
 * @MichaelSaucier
 
-# TLC 4.5 governance ownership
-/.governance/tlc/ @MichaelSaucier
-/.github/workflows/tlc-4.5.yml @MichaelSaucier
diff --git a/.github/workflows/tlc-4.5.yml b/.github/workflows/tlc-4.5.yml
deleted file mode 100644
index 2c9ba13..0000000
--- a/.github/workflows/tlc-4.5.yml
+++ /dev/null
@@ -1,100 +0,0 @@
-name: TLC 4.5
-
-on:
-  pull_request_target:
-    types: [opened, synchronize, reopened, ready_for_review, edited]
-  push:
-    branches:
-      - "main"
-
-permissions:
-  contents: read
-  issues: read
-  pull-requests: read
-  statuses: write
-
-jobs:
-  tlc-4-5:
-    if: github.event_name == 'pull_request_target'
-    uses: transpara-ai/.github/.github/workflows/tlc-4.5-reusable.yml@b67aa87c53cd818140407642961de5461c61e963
-    with:
-      pr_number: ${{ github.event.pull_request.number }}
-      base_sha: ${{ github.event.pull_request.base.sha }}
-      head_sha: ${{ github.event.pull_request.head.sha }}
-      enforcement_mode: audit
-      workflow_commit: b67aa87c53cd818140407642961de5461c61e963
-      activation_commit: 0057171a729566fd5d42a8147e8258d0928eb593
-
-  discover-base-prs:
-    if: github.event_name == 'push'
-    runs-on: ubuntu-latest
-    outputs:
-      prs: ${{ steps.open-prs.outputs.prs }}
-    steps:
-      - id: open-prs
-        shell: bash
-        env:
-          GH_TOKEN: ${{ github.token }}
-          TLC_REPOSITORY: ${{ github.repository }}
-          TLC_BASE_REF: ${{ github.ref_name }}
-        run: |
-          python3 - <<'PY'
-          import json
-          import os
-          import urllib.parse
-          import urllib.request
-
-          repository = os.environ["TLC_REPOSITORY"]
-          base_ref = os.environ["TLC_BASE_REF"]
-          token = os.environ["GH_TOKEN"]
-          pulls = []
-          page = 1
-          while True:
-              query = urllib.parse.urlencode(
-                  {"state": "open", "base": base_ref, "per_page": 100, "page": page}
-              )
-              request = urllib.request.Request(
-                  f"https://api.github.com/repos/{repository}/pulls?{query}",
-                  headers={
-                      "Accept": "application/vnd.github+json",
-                      "Authorization": f"Bearer {token}",
-                      "X-GitHub-Api-Version": "2022-11-28",
-                  },
-              )
-              with urllib.request.urlopen(request, timeout=30) as response:
-                  rows = json.load(response)
-              if not isinstance(rows, list):
-                  raise SystemExit("GitHub pull request response is not a list")
-              pulls.extend(rows)
-              if len(rows) < 100:
-                  break
-              page += 1
-          if len(pulls) > 256:
-              raise SystemExit("more than 256 open pull requests target the advanced base")
-          matrix = [
-              {
-                  "pr_number": int(pull["number"]),
-                  "base_sha": pull["base"]["sha"],
-                  "head_sha": pull["head"]["sha"],
-              }
-              for pull in sorted(pulls, key=lambda item: int(item["number"]))
-          ]
-          with open(os.environ["GITHUB_OUTPUT"], "a", encoding="utf-8") as output:
-              output.write("prs=" + json.dumps(matrix, separators=(",", ":")) + "\n")
-          PY
-
-  tlc-4-5-base-refresh:
-    needs: discover-base-prs
-    if: needs.discover-base-prs.outputs.prs != '[]'
-    strategy:
-      fail-fast: false
-      matrix:
-        pr: ${{ fromJSON(needs.discover-base-prs.outputs.prs) }}
-    uses: transpara-ai/.github/.github/workflows/tlc-4.5-reusable.yml@b67aa87c53cd818140407642961de5461c61e963
-    with:
-      pr_number: ${{ matrix.pr.pr_number }}
-      base_sha: ${{ matrix.pr.base_sha }}
-      head_sha: ${{ matrix.pr.head_sha }}
-      enforcement_mode: audit
-      workflow_commit: b67aa87c53cd818140407642961de5461c61e963
-      activation_commit: 0057171a729566fd5d42a8147e8258d0928eb593