diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index 6bf46f1..9b32726 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -8,7 +8,7 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
 
     steps:
     - uses: actions/checkout@v2
@@ -16,7 +16,7 @@ jobs:
       run: | 
         sudo apt-get update
         sudo apt-get install autoconf
-        sudo apt-get install libboost1.74-all-dev
+        sudo apt-get install boost1.71
         sudo apt-get install cmake 
         sudo apt-get install g++
 
diff --git a/sbg/test/stest/compile_and_run.sh b/sbg/test/stest/compile_and_run.sh
index 257039c..cd50dbe 100755
--- a/sbg/test/stest/compile_and_run.sh
+++ b/sbg/test/stest/compile_and_run.sh
@@ -8,6 +8,6 @@ TEST_MODEL=${TEST_MODEL_FOLDER}/${MODEL}
 mkdir ${TEST_MODEL_FOLDER}
 TEST_FOLDER=`pwd`
 echo ${TEST_FOLDER}
-g++ ${GT_MODEL} -I../../../ -L../../../lib -o ${TEST_MODEL} -lsbgraph  
+g++ ${GT_MODEL} -I../../../ -L../../../lib -std=c++17 -o ${TEST_MODEL} -lsbgraph  
 cd ${TEST_MODEL_FOLDER}
 ./${MODEL}