diff --git a/.github/workflows/builds.yml b/.github/workflows/builds.yml
index 2112227914..df4b0c9742 100644
--- a/.github/workflows/builds.yml
+++ b/.github/workflows/builds.yml
@@ -1278,7 +1278,7 @@ jobs:
                 zlib1g \
                 zlib1g-dev
       - name: Install Rust
-        run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain $RUST_VERSION_KNOWN -y
+        run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain $RUST_VERSION_MIN -y
       - run: echo "$HOME/.cargo/bin" >> $GITHUB_PATH
       - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
       - uses: actions/download-artifact@fb598a63ae348fa914e94cd0ff38f362e927b741