diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 61723cd..1e20067 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@
 
 jobs:
   linux:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     env:
       CC: ${{ matrix.compiler }}
@@ -167,11 +167,6 @@
             # Use llvm-cov instead of gcov when compiler is clang.
             ln -fs /usr/bin/llvm-cov ${HOME}/bin/gcov
           fi
-          # Setup lua5.3 manually since its package doesn't provide alternative.
-          # https://bugs.launchpad.net/ubuntu/+source/lua5.3/+bug/1707212
-          if [[ ${CONFOPT} =~ luainterp ]]; then
-            sudo update-alternatives --install /usr/bin/lua lua /usr/bin/lua5.3 10
-          fi
           sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0
           sudo usermod -a -G audio "${USER}"
           sudo bash ci/setup-xvfb.sh
@@ -268,7 +263,7 @@
           done
 
   # coveralls:
-  #   runs-on: ubuntu-18.04
+  #   runs-on: ubuntu-20.04
   #
   #   needs: linux
   #   if: always() && github.event_name != 'pull_request'
diff --git a/src/version.c b/src/version.c
index ce61bbc..c17f7f8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -732,6 +732,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    264,
+/**/
     263,
 /**/
     262,