diff --git a/.github/workflows/core_build.yml b/.github/workflows/core_build.yml
index 90ede0c88..d54fd1031 100644
--- a/.github/workflows/core_build.yml
+++ b/.github/workflows/core_build.yml
@@ -26,7 +26,7 @@ jobs:
             modules: without
             extra_logs: false
           - os: ubuntu-20.04
-            compiler: clang9
+            compiler: clang8
             modules: without
             extra_logs: false
           - os: ubuntu-18.04
diff --git a/apps/ci/ci-conf.sh b/apps/ci/ci-conf.sh
index 0d06410dc..b853f50a8 100644
--- a/apps/ci/ci-conf.sh
+++ b/apps/ci/ci-conf.sh
@@ -53,6 +53,12 @@ case $COMPILER in
     echo "CCOMPILERCXX=\"clang++-6.0\"" >> ./conf/config.sh
     ;;
 
+  "clang8" )
+    time sudo apt-get install -y clang-8
+    echo "CCOMPILERC=\"clang-8\"" >> ./conf/config.sh
+    echo "CCOMPILERCXX=\"clang++-8\"" >> ./conf/config.sh
+    ;;
+
   "clang9" )
     time sudo apt-get install -y clang-9
     echo "CCOMPILERC=\"clang-9\"" >> ./conf/config.sh
diff --git a/apps/ci/ci-install.sh b/apps/ci/ci-install.sh
index cc0681533..14d3395e8 100644
--- a/apps/ci/ci-install.sh
+++ b/apps/ci/ci-install.sh
@@ -58,6 +58,12 @@ case $COMPILER in
     echo "CCOMPILERCXX=\"clang++-6.0\"" >> ./conf/config.sh
     ;;
 
+  "clang8" )
+    time sudo apt-get install -y clang-8
+    echo "CCOMPILERC=\"clang-8\"" >> ./conf/config.sh
+    echo "CCOMPILERCXX=\"clang++-8\"" >> ./conf/config.sh
+    ;;
+
   "clang9" )
     time sudo apt-get install -y clang-9
     echo "CCOMPILERC=\"clang-9\"" >> ./conf/config.sh