diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 87d68f32da2a3d2970790d872877e3979fd743f3..8b763acf0e604bdc10babb8cdcbda26851e2d110 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -32,11 +32,12 @@ build-coq.dev:
   variables:
     OPAM_PINS: "coq version dev"
 
-build-coq.8.11.2:
+build-coq.8.12.0:
   <<: *template
   variables:
     OPAM_PINS: "coq version 8.11.2"
     OPAM_PKG: "coq-lambda-rust"
+    DENY_WARNINGS: "1"
   tags:
   - fp-timing
 
diff --git a/README.md b/README.md
index 2e73be104c0a13cee665e3685a8fc6cc0880826b..3f3d91cb280439eb539b4afa02d9d47001c2f46e 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ This is the Coq development accompanying lambda-Rust.
 
 This version is known to compile with:
 
- - Coq 8.11.2
+ - Coq 8.12.0
  - A development version of [Iris](https://gitlab.mpi-sws.org/iris/iris)
 
 ## Building from source