diff --git a/dune-project b/dune-project
index 1161e8fa..d77f330c 100644
--- a/dune-project
+++ b/dune-project
@@ -24,7 +24,7 @@
  (synopsis "LSP server library")
  (depends
   ("yojson"
-   (>= "1.6"))
+   (and (>= "1.6") (< "3.0")))
   "logs"
   ("trace"
    (>= "0.4"))
diff --git a/linol.opam b/linol.opam
index 0713f998..a11f6a2d 100644
--- a/linol.opam
+++ b/linol.opam
@@ -9,7 +9,7 @@ homepage: "https://github.com/c-cube/linol"
 bug-reports: "https://github.com/c-cube/linol/issues"
 depends: [
   "dune" {>= "2.0"}
-  "yojson" {>= "1.6"}
+  "yojson" {>= "1.6" & < "3.0"}
   "logs"
   "trace" {>= "0.4"}
   "ocaml" {>= "4.14"}