diff --git a/.github/workflows/.yamllint b/.github/workflows/.yamllint
new file mode 100644
index 00000000..ed47667e
--- /dev/null
+++ b/.github/workflows/.yamllint
@@ -0,0 +1,30 @@
+---
+
+extends: default
+
+rules:
+  braces:
+    level: warning
+    max-spaces-inside: 1
+  brackets:
+    level: warning
+    max-spaces-inside: 1
+  colons:
+    level: warning
+  commas:
+    level: warning
+  comments: disable
+  comments-indentation: disable
+  document-start: disable
+  empty-lines:
+    level: warning
+  hyphens:
+    level: warning
+  indentation:
+    level: warning
+    indent-sequences: consistent
+  line-length:
+    max: 160
+    level: warning
+    allow-non-breakable-inline-mappings: true
+  truthy: disable
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 604d6254..dfa582b5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,6 +33,11 @@ jobs:
         with:
           submodules: 'true'
         # If Clang 17, install a newer version of libc++ and libc++abi.
+      - name: Update packages
+        run: |
+          set -x
+          sudo apt update
+          sudo apt -y upgrade
       - name: Install libc++
         if: matrix.config.tag == 'clang:17'
         run: |