diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 5d26c24b60..bb5e10774a 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -130,7 +130,8 @@
         - libzstd-dev
       curl_env:
         T: debug-rustls
-        RUSTLS_VERSION: v0.7.1
+        RUSTLS_VERSION: v0.7.2
+        LIBS: -lm
         C: >-
           --with-rustls={{ ansible_user_dir }}/crust