diff --git a/.github/workflows/build_test.yml b/.github/workflows/build_test.yml
index 3b86689d27..c9aec779c8 100644
--- a/.github/workflows/build_test.yml
+++ b/.github/workflows/build_test.yml
@@ -13,13 +13,14 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
         env:
           - { COMPILER: "gcc",   COMPILER_VERSION: "10" }
           - { COMPILER: "clang", COMPILER_VERSION: "10" }
+          - { COMPILER: "clang", COMPILER_VERSION: "11" }
     env: ${{ matrix.env }}
     steps:
       - name: Repository checkout
diff --git a/.github/workflows/ubuntu-build-check.sh b/.github/workflows/ubuntu-build-check.sh
index 75fc36fffb..0892e08dd1 100755
--- a/.github/workflows/ubuntu-build-check.sh
+++ b/.github/workflows/ubuntu-build-check.sh
@@ -19,7 +19,6 @@ PACKAGES=(
     expect
     fdisk
     gettext
-    iptables-dev
     iputils-ping
     isc-dhcp-client
     itstool
@@ -28,6 +27,7 @@ PACKAGES=(
     libcap-dev
     libcurl4-gnutls-dev
     libfdisk-dev
+    libfido2-dev
     libgpg-error-dev
     liblz4-dev
     liblzma-dev
@@ -38,6 +38,7 @@ PACKAGES=(
     libqrencode-dev
     libssl-dev
     libxkbcommon-dev
+    libxtables-dev
     libzstd-dev
     mount
     net-tools