diff --git a/dune-project b/dune-project
index 381278bd7..2a161a3bf 100644
--- a/dune-project
+++ b/dune-project
@@ -69,7 +69,7 @@ possible and does not make any assumptions about IO.
   (ocamlformat-rpc-lib (>= 0.21.0))
   (odoc :with-doc)
   (ocaml (and (>= 4.14) (< 5.2)))
-  (merlin-lib (and (>= 4.14) (< 5.0)))))
+  (merlin-lib (and (>= 4.16) (< 5.0)))))
 
 (package
  (name jsonrpc)
diff --git a/ocaml-lsp-server.opam b/ocaml-lsp-server.opam
index 39f9dfb7c..a3fd5abf5 100644
--- a/ocaml-lsp-server.opam
+++ b/ocaml-lsp-server.opam
@@ -45,7 +45,7 @@ depends: [
   "ocamlformat-rpc-lib" {>= "0.21.0"}
   "odoc" {with-doc}
   "ocaml" {>= "4.14" & < "5.2"}
-  "merlin-lib" {>= "4.14" & < "5.0"}
+  "merlin-lib" {>= "4.16" & < "5.0"}
 ]
 dev-repo: "git+https://github.com/ocaml/ocaml-lsp.git"
 build: [