diff --git a/coq-stdpp.opam b/coq-stdpp.opam
index 2d8504d7ac772dbe84087d72b8f3ebb62e40a008..5edaa83511321dc98f2b17e9d6931a91185e0cee 100644
--- a/coq-stdpp.opam
+++ b/coq-stdpp.opam
@@ -33,7 +33,7 @@ tags: [
 ]
 
 depends: [
-  "coq" { (>= "8.18" & < "8.21~") | (= "dev") }
+  "coq" { (>= "8.18" & < "9.1~") | (= "dev") }
 ]
 
 build: ["./make-package" "stdpp" "-j%{jobs}%"]