diff --git a/.github/workflows/core_build.yml b/.github/workflows/core_build.yml
index d3403b7d2..ae78caa26 100644
--- a/.github/workflows/core_build.yml
+++ b/.github/workflows/core_build.yml
@@ -17,6 +17,9 @@ jobs:
         modules: [with, without]
         # we can include specific combinations here
         include:
+          - os: ubuntu-20.04
+            compiler: clang11
+            modules: without
           - os: ubuntu-20.04
             compiler: clang9
             modules: without
diff --git a/apps/ci/ci-conf.sh b/apps/ci/ci-conf.sh
index b3a75448a..3fb0eae9e 100644
--- a/apps/ci/ci-conf.sh
+++ b/apps/ci/ci-conf.sh
@@ -65,6 +65,12 @@ case $COMPILER in
     echo "CCOMPILERCXX=\"clang++-10\"" >> ./conf/config.sh
     ;;
 
+  "clang11" )
+    time sudo apt-get install -y clang-11
+    echo "CCOMPILERC=\"clang-11\"" >> ./conf/config.sh
+    echo "CCOMPILERCXX=\"clang++-11\"" >> ./conf/config.sh
+    ;;
+
   * )
     echo "Unknown compiler $COMPILER"
     exit 1
diff --git a/apps/ci/ci-install.sh b/apps/ci/ci-install.sh
index 3ad34c6c5..cc0681533 100644
--- a/apps/ci/ci-install.sh
+++ b/apps/ci/ci-install.sh
@@ -70,6 +70,12 @@ case $COMPILER in
     echo "CCOMPILERCXX=\"clang++-10\"" >> ./conf/config.sh
     ;;
 
+  "clang11" )
+    time sudo apt-get install -y clang-11
+    echo "CCOMPILERC=\"clang-11\"" >> ./conf/config.sh
+    echo "CCOMPILERCXX=\"clang++-11\"" >> ./conf/config.sh
+    ;;
+
   * )
     echo "Unknown compiler $COMPILER"
     exit 1