diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 71fdf3652..a3cc92a8e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,9 +33,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install deps
         run: |
-          sudo apt-get install g++-6 gcc-6 -qyy
           source ./util/ci/common.sh
-          install_linux_deps
+          install_linux_deps g++-6
 
       - name: Build
         run: |
@@ -55,9 +54,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install deps
         run: |
-          sudo apt-get install g++-8 gcc-8 -qyy
           source ./util/ci/common.sh
-          install_linux_deps
+          install_linux_deps g++-8
 
       - name: Build
         run: |
@@ -77,9 +75,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install deps
         run: |
-          sudo apt-get install clang-3.9 -qyy
           source ./util/ci/common.sh
-          install_linux_deps
+          install_linux_deps clang-3.9
 
       - name: Build
         run: |
@@ -99,11 +96,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install deps
         run: |
-          sudo apt-get install clang-9 valgrind -qyy
           source ./util/ci/common.sh
-          install_linux_deps
-        env:
-          WITH_LUAJIT: 1
+          install_linux_deps clang-9 valgrind libluajit-5.1-dev
 
       - name: Build
         run: |
@@ -111,6 +105,7 @@ jobs:
         env:
           CC: clang-9
           CXX: clang++-9
+          CMAKE_FLAGS: "-DREQUIRE_LUAJIT=1"
 
       - name: Test
         run: |
@@ -128,9 +123,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install deps
         run: |
-          sudo apt-get install clang-9 -qyy
           source ./util/ci/common.sh
-          install_linux_deps
+          install_linux_deps clang-9
 
       - name: Build prometheus-cpp
         run: |
@@ -156,9 +150,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install deps
         run: |
-          sudo apt-get install clang-9 -qyy
           source ./util/ci/common.sh
-          install_linux_deps
+          install_linux_deps clang-9
 
       - name: Build
         run: |
@@ -188,7 +181,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install compiler
         run: |
-          sudo apt-get install gettext -qyy
+          sudo apt-get update -q && sudo apt-get install gettext -qyy
           wget http://minetest.kitsunemimi.pw/mingw-w64-i686_9.2.0_ubuntu18.04.tar.xz -O mingw.tar.xz
           sudo tar -xaf mingw.tar.xz -C /usr
 
@@ -206,7 +199,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install compiler
         run: |
-          sudo apt-get install gettext -qyy
+          sudo apt-get update -q && sudo apt-get install gettext -qyy
           wget http://minetest.kitsunemimi.pw/mingw-w64-x86_64_9.2.0_ubuntu18.04.tar.xz -O mingw.tar.xz
           sudo tar -xaf mingw.tar.xz -C /usr
 
diff --git a/util/ci/common.sh b/util/ci/common.sh
index a2e4beac9..7523fa7ff 100644
--- a/util/ci/common.sh
+++ b/util/ci/common.sh
@@ -7,13 +7,9 @@ install_linux_deps() {
 		libhiredis-dev libogg-dev libgmp-dev libvorbis-dev libopenal-dev \
 		gettext libpq-dev postgresql-server-dev-all libleveldb-dev \
 		libcurl4-openssl-dev)
-	# for better coverage, build some jobs with luajit
-	if [ -n "$WITH_LUAJIT" ]; then
-		pkgs+=(libluajit-5.1-dev)
-	fi
 
 	sudo apt-get update
-	sudo apt-get install -y --no-install-recommends ${pkgs[@]}
+	sudo apt-get install -y --no-install-recommends ${pkgs[@]} "$@"
 }
 
 # Mac OSX build only