diff --git a/.github/actions/openvic-sim-build/action.yml b/.github/actions/openvic-sim-build/action.yml
index 01c3332b5..03b93e5d2 100644
--- a/.github/actions/openvic-sim-build/action.yml
+++ b/.github/actions/openvic-sim-build/action.yml
@@ -69,19 +69,19 @@ runs:
       with:
         packages: build-essential pkg-config libtbb-dev
 
-    - name: Install g++13
+    - name: Install g++15
       if: ${{ runner.os == 'Linux' }}
       uses: awalsh128/cache-apt-pkgs-action@553a35bb8ebd9fcabcb1c9451aa4c98e1b4ca8a9 # v1.6.3
       with:
         add-repository: ppa:ubuntu-toolchain-r/test
-        packages: g++-13
+        packages: g++-15
 
-    - name: Set g++ to version 13
+    - name: Set g++ to version 15
       if: ${{ runner.os == 'Linux' }}
       shell: sh
       run: |
-        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-13 13
-        sudo update-alternatives --set g++ /usr/bin/g++-13
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-15 15
+        sudo update-alternatives --set g++ /usr/bin/g++-15
         g++ --version
 
     - name: Build