diff --git a/.github/workflows/full-test.yml b/.github/workflows/full-test.yml
index f62789e0..58caf58f 100644
--- a/.github/workflows/full-test.yml
+++ b/.github/workflows/full-test.yml
@@ -45,9 +45,9 @@ jobs:
       if: startsWith(matrix.os, 'ubuntu')
       run: |
         python -m pip install cython
-        wget https://github.com/nest/nest-simulator/archive/refs/tags/v3.8.tar.gz -O nest-simulator-3.8.tar.gz
-        tar xzf nest-simulator-3.8.tar.gz
-        cmake -DCMAKE_INSTALL_PREFIX=$HOME/.local -Dwith-mpi=ON ./nest-simulator-3.8
+        wget https://github.com/nest/nest-simulator/archive/refs/tags/v3.9_rc2.tar.gz -O nest-simulator-3.9_rc2.tar.gz
+        tar xzf nest-simulator-3.9_rc2.tar.gz
+        cmake -DCMAKE_INSTALL_PREFIX=$HOME/.local -Dwith-mpi=ON ./nest-simulator-3.9_rc2
         make
         make install
     - name: Install Arbor
@@ -84,7 +84,7 @@ jobs:
         coveralls --service=github
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        COVERALLS_FLAG_NAME: ${{ matrix.test-name }}
+        COVERALLS_FLAG_NAME: ${{ matrix.os }}-${{ matrix.python-version }}
         COVERALLS_PARALLEL: true
   coveralls:
     name: Indicate completion to coveralls.io