diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3c8bb11db8673c269d9e81a1d8476630472ae7fe..06b6c85bca4b7792dca59787b8a0524d9571ed84 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -40,6 +40,11 @@ build-coq.8.10.dev:
     OCAML: "ocaml-base-compiler.4.07.0"
     OPAM_PINS: "coq version 8.10.dev"
 
+build-coq.8.9.1:
+  <<: *template
+  variables:
+    OPAM_PINS: "coq version 8.9.1"
+
 build-coq.8.9.0:
   <<: *template
   variables:
@@ -55,20 +60,7 @@ build-coq.8.8.2:
   variables:
     OPAM_PINS: "coq version 8.8.2"
 
-build-coq.8.8.0:
-  <<: *template
-  variables:
-    OPAM_PINS: "coq version 8.8.0"
-    TIMING_CONF: "coq-8.8.0"
-  tags:
-  - fp-timing
-
 build-coq.8.7.2:
   <<: *template
   variables:
     OPAM_PINS: "coq version 8.7.2"
-
-build-coq.8.7.1:
-  <<: *template
-  variables:
-    OPAM_PINS: "coq version 8.7.1"
diff --git a/README.md b/README.md
index b3a8b0385f38691e23726d88aa4a41c8d3c2669a..234aae22fd2165da5ccbe6500ff1f051fd0d8075 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ definitions and some derived forms is available in
 
 This version is known to compile with:
 
- - Coq 8.7.1 / 8.7.2 / 8.8.0 / 8.8.2 / 8.9.0
+ - Coq 8.7.2 / 8.8.2 / 8.9.0 / 8.9.1
  - A development version of [std++](https://gitlab.mpi-sws.org/iris/stdpp)
 
 For a version compatible with Coq 8.6, have a look at the
diff --git a/opam b/opam
index 56e7c61f14bf5c5d965ae2c0d0ade6b74776edf3..4ffee67e44c95b9cff7a091677bf2310881df2e5 100644
--- a/opam
+++ b/opam
@@ -11,6 +11,6 @@ build: [make "-j%{jobs}%"]
 install: [make "install"]
 remove: ["rm" "-rf" "%{lib}%/coq/user-contrib/iris"]
 depends: [
-  "coq" { (>= "8.7.1" & < "8.11~") | (= "dev") }
+  "coq" { (= "8.7.2") | (= "8.8.2") | (>= "8.9" & < "8.11~") | (= "dev") }
   "coq-stdpp" { (= "dev.2019-05-15.0.7b7ee122") | (= "dev") }
 ]