diff --git a/.github/workflows/ci-emscripten.yml b/.github/workflows/ci-emscripten.yml
index 13cce318c7..30cd2e8449 100644
--- a/.github/workflows/ci-emscripten.yml
+++ b/.github/workflows/ci-emscripten.yml
@@ -23,6 +23,13 @@ jobs:
       run: |
         git config --global --add safe.directory ${GITHUB_WORKSPACE}
 
+    - name: Update to modern GCC
+      run: |
+        apt-get update
+        apt-get install -y gcc-12 g++-12
+        update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 100
+        update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-12 100
+
     - name: Setup cache
       uses: actions/cache@v4
       with:
diff --git a/os/emscripten/Dockerfile b/os/emscripten/Dockerfile
index 543bf6b2de..57c332b1e3 100644
--- a/os/emscripten/Dockerfile
+++ b/os/emscripten/Dockerfile
@@ -1,3 +1,10 @@
 FROM emscripten/emsdk:3.1.57
 
+RUN apt-get update \
+    && apt-get install -y gcc-12 g++-12 \
+    && update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 100 \
+    && update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-12 100 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
 COPY ports/liblzma.py /emsdk/upstream/emscripten/tools/ports/contrib/liblzma.py