diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a684e224cba5861530fda76a817ff513f9e34558..755dc095930799b57e1bf7924075e0670342dab6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -41,10 +41,10 @@ build-coq.8.10.1:
   tags:
   - fp-timing
 
-build-coq.8.9.0:
+build-coq.8.9.1:
   <<: *template
   variables:
-    OPAM_PINS: "coq version 8.9.0"
+    OPAM_PINS: "coq version 8.9.1"
 
 build-iris.dev:
   <<: *template
diff --git a/README.md b/README.md
index 34a27de7e8f0e80a8820c993cce55b8dfb03aa21..8ffe198877de2404197ee5e191572ff577e46325 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 8.9.0 / 8.10.1
+ - Coq 8.9.1 / 8.10.1
  - A development version of [Iris](https://gitlab.mpi-sws.org/iris/iris)
 
 ## Building from source