diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2cfd4b7c384d7d4e40db81d86c593f50543f6b84..6f2bf5546aff910915da3ed37d2a6cfbedcfac7f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -28,11 +28,10 @@ variables:
 
 ## Build jobs
 
-build-coq.8.18.0:
+build-coq.8.20.0:
   <<: *template
   variables:
-    OPAM_PINS: "coq version 8.18.0"
-    DENY_WARNINGS: "1"
+    OPAM_PINS: "coq version 8.20.0"
   tags:
   - fp-timing
 
diff --git a/README.md b/README.md
index faac6e172d7cac442b99d8c51d4e53522d5169b7..967f86b851724f72a44e038cbf2b69ef2eb6f621 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ See the small ReLoC [docs/guide.md](docs/guide.md) and the Iris [ProofGuide.md](
 
 ## Building
 
-This project has been tested with Coq 8.18.0.
+This project has been tested with Coq 8.20.0.
 
 ### OPAM