diff --git a/.github/workflows/test_eessi.yml b/.github/workflows/test_eessi.yml
index 04195dd619..65415f87fc 100644
--- a/.github/workflows/test_eessi.yml
+++ b/.github/workflows/test_eessi.yml
@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         EESSI_VERSION:
-        - 2021.12
+        - 2023.06
         EESSI_SOFTWARE_SUBDIR:
         - aarch64/generic
         - aarch64/graviton2
@@ -20,6 +20,8 @@ jobs:
         - x86_64/intel/haswell
         - x86_64/intel/skylake_avx512
         - x86_64/generic
+        EASYSTACK_FILE:
+        - eessi-2023.06-eb-4.7.2-2021a.yml
     steps:
         - name: Check out software-layer repository
           uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0
@@ -41,7 +43,7 @@ jobs:
               export EESSI_SOFTWARE_SUBDIR=${{matrix.EESSI_SOFTWARE_SUBDIR}}
               env | grep ^EESSI | sort
               echo "just run check_missing_installations.sh (should use eessi-${{matrix.EESSI_VERSION}}.yml)"
-              ./check_missing_installations.sh
+              ./check_missing_installations.sh ${{matrix.EASYSTACK_FILE}}
 
         - name: Test check_missing_installations.sh with missing package (GCC/8.3.0)
           run: |
@@ -52,18 +54,15 @@ jobs:
               export EESSI_OS_TYPE=linux
               export EESSI_SOFTWARE_SUBDIR=${{matrix.EESSI_SOFTWARE_SUBDIR}}
               env | grep ^EESSI | sort
-              echo "modify eessi-${{matrix.EESSI_VERSION}}.yml by adding a missing package (GCC/8.3.0)"
-              echo "  GCC:" >> eessi-${{matrix.EESSI_VERSION}}.yml
-              echo "    toolchains:" >> eessi-${{matrix.EESSI_VERSION}}.yml
-              echo "      SYSTEM:" >> eessi-${{matrix.EESSI_VERSION}}.yml
-              echo "        versions: '8.3.0'" >> eessi-${{matrix.EESSI_VERSION}}.yml
-              tail -n 4 eessi-${{matrix.EESSI_VERSION}}.yml
+              echo "modify easystack file by adding a missing package (GCC/8.3.0)"
+              echo "  - GCC-8.3.0:" >> ${{matrix.EASYSTACK_FILE}}
+              tail -n 5 ${{matrix.EASYSTACK_FILE}}
               # note, check_missing_installations.sh exits 1 if a package was
               # missing, which is intepreted as false (exit code based, not
               # boolean logic), hence when the script exits 0 if no package was
               # missing it is interpreted as true, thus the test did not capture
               # the missing package
-              if ./check_missing_installations.sh; then
+              if ./check_missing_installations.sh ${{matrix.EASYSTACK_FILE}}; then
                 echo "did NOT capture missing package; test FAILED"
                 exit 1
               else
diff --git a/.github/workflows/tests_scripts.yml b/.github/workflows/tests_scripts.yml
index 5c0b3893ae..8ad4928993 100644
--- a/.github/workflows/tests_scripts.yml
+++ b/.github/workflows/tests_scripts.yml
@@ -92,6 +92,6 @@ jobs:
           # since create_directory_tarballs.sh must be accessible from within build container
           cp -a * /tmp/
           cd /tmp
-          ./build_container.sh run /tmp/$USER/EESSI /tmp/create_directory_tarballs.sh 2021.12
+          ./build_container.sh run /tmp/$USER/EESSI /tmp/create_directory_tarballs.sh 2023.06
           # check if tarballs have been produced
           ls -l *.tar.gz