diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 27273aa..1696961 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -102,13 +102,14 @@ jobs:
       - name: Install Geth on Ubuntu
         if: matrix.os == 'ubuntu-24.04'
         run: |
-          sudo add-apt-repository -y ppa:ethereum/ethereum
           sudo apt-get update
-          sudo apt-get install -y ethereum=1.15.11+build31083+noble protobuf-compiler
+          sudo apt-get install -y protobuf-compiler
 
-          # This pins the version of `ethereum` so that it can't be upgraded by mistake if we run
-          # apt update in a later step.
-          sudo apt-mark hold ethereum
+          # Download and install Geth all-tools from the geth store website as the PPA only has the
+          # latest versions of Geth.
+          sudo apt-get install -y wget ca-certificates tar
+          wget -qO- https://gethstore.blob.core.windows.net/builds/geth-alltools-linux-arm64-1.15.11-36b2371c.tar.gz \
+            | sudo tar xz -C /usr/local/bin --strip-components=1
 
       - name: Install Geth on macOS
         if: matrix.os == 'macos-14'