diff --git a/.github/workflows/build-classic.yml b/.github/workflows/build-classic.yml
new file mode 100644
index 0000000..c263d1f
--- /dev/null
+++ b/.github/workflows/build-classic.yml
@@ -0,0 +1,65 @@
+name: Build Classic GCC 4.8.5
+
+on:
+  push:
+    branches:
+      - master
+      - develop
+
+  pull_request:
+    branches:
+      - master
+      - develop
+
+jobs:
+  build-classic:
+    if: >-
+      ! contains(toJSON(github.event.commits.*.message), '[skip ci]') &&
+      ! contains(toJSON(github.event.commits.*.message), '[skip github]')
+
+    runs-on: ${{matrix.os}}
+
+    strategy:
+      fail-fast: false
+
+      matrix:
+        os: [ 'centos-7' ]
+        gcc_version: [ '4.8.5' ]
+        build_type: [ Release ]
+
+    name: "On ${{matrix.os}} gcc-${{matrix.gcc_version}} ${{matrix.build_type}}"
+
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          submodules: recursive
+
+      - uses: friendlyanon/fetch-core-count@v1
+        id: cores
+
+      - name: Set output
+        id: strings
+        shell: bash
+        run: |
+          echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
+
+      - name: CMake & GCC
+        run: |
+          cmake --version
+          gcc --version
+          g++ --version
+
+      - name: Configure
+        run: >-
+          cmake -B "${{ steps.strings.outputs.build-output-dir }}"
+          -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
+          -S "${{ github.workspace }}"
+
+      - name: Build
+        run: >-
+          cmake --build "${{ steps.strings.outputs.build-output-dir }}"
+          --config ${{ matrix.build_type }}
+
+      - name: Test
+        working-directory: "${{ steps.strings.outputs.build-output-dir }}"
+        run: ctest  --output-on-failure --build-config ${{ matrix.build_type }}
diff --git a/.github/workflows/build-gcc.yml b/.github/workflows/build-gcc.yml
index 6bea492..a252297 100644
--- a/.github/workflows/build-gcc.yml
+++ b/.github/workflows/build-gcc.yml
@@ -17,13 +17,13 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip ci]') &&
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
 
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     strategy:
       fail-fast: false
 
       matrix:
-        gcc_version: ['latest', '12', '11', '10', '9', '8', '7', '6', '5', '4.8.5']
+        gcc_version: ['latest', '12', '11', '10', '9', '8', '7', '6', '5']
         build_type: [Release]
 
     name: "In Container GCC ${{matrix.gcc_version}} ${{matrix.build_type}}"
@@ -39,7 +39,6 @@ jobs:
 
       - uses: friendlyanon/fetch-core-count@v1
         id: cores
-        if: matrix.gcc_version != '4.8.5'
 
       - name: Set output
         id: strings