diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0eade4c..0404e5e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -93,6 +93,12 @@ jobs:
         version: [24.5]
     steps:
     - uses: actions/checkout@v2
+    - name: Free Disk Space (Ubuntu)
+      uses: jlumbroso/free-disk-space@main
+      with:
+        # this might remove tools that are actually needed,
+        # if set to "true" but frees about 6 GB
+        tool-cache: false
     - name: Build
       run: >
         docker build
diff --git a/parmetis/Dockerfile b/parmetis/Dockerfile
index 1fc7ef3..d80504a 100644
--- a/parmetis/Dockerfile
+++ b/parmetis/Dockerfile
@@ -5,7 +5,7 @@ LABEL maintainer="Marco Bettiol <marco.bettiol@cscs.ch>"
 
 ARG PARMETIS_VERSION=4.0.3
 RUN cd /tmp && \
-    wget -q http://glaros.dtc.umn.edu/gkhome/fetch/sw/parmetis/parmetis-${PARMETIS_VERSION}.tar.gz && \
+    wget -q https://karypis.github.io/glaros/files/sw/parmetis/parmetis-${PARMETIS_VERSION}.tar.gz && \
     tar xzf parmetis-${PARMETIS_VERSION}.tar.gz && \
     cd parmetis-${PARMETIS_VERSION} && \
     sed -i 's/#define IDXTYPEWIDTH 32/#define IDXTYPEWIDTH 64/g' metis/include/metis.h && \