diff --git a/.buildbot.sh b/.buildbot.sh
index 12e09b518b433..5b10e218f6438 100644
--- a/.buildbot.sh
+++ b/.buildbot.sh
@@ -8,6 +8,14 @@ set -e
 # depth for the bootstrapper to find the correct llvm sha
 git fetch --unshallow
 
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > rustup.sh
+sh rustup.sh --default-host x86_64-unknown-linux-gnu \
+    --default-toolchain nightly \
+    --no-modify-path \
+    --profile minimal \
+    -y
+export PATH=`pwd`/.cargo/bin/:$PATH
+
 export CARGO_HOME="`pwd`/.cargo"
 export RUSTUP_HOME="`pwd`/.rustup"
 
@@ -16,3 +24,9 @@ ulimit -d $((1024 * 1024 * 8)) # 8 GiB
 
 /usr/bin/time -v python3 x.py test --stage 2 --config .buildbot.config.toml --exclude rustdoc-json --exclude debuginfo
 
+# Build and test yksom
+git clone --recursive https://github.com/softdevteam/yksom
+cd yksom
+rustup toolchain link alloy build/x86_64-unknown-linux-gnu/stage1
+cargo +alloy test
+cargo +alloy test --release