diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9be5bdf3e12..a75aefc7025 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -190,6 +190,7 @@ jobs:
           cargo update -p plotters-svg --precise 0.3.1
           cargo update -p plotters-backend --precise 0.3.2
           cargo update -p serde --precise 1.0.142
+          cargo update -p libc --precise 0.2.127
 
       - name: Build docs
         run: cargo doc --no-deps --no-default-features --features "full ${{ matrix.extra_features }}"