diff --git a/dune-project b/dune-project
index 8c1d67e8e..9f20b4124 100644
--- a/dune-project
+++ b/dune-project
@@ -31,7 +31,7 @@ possible and does not make any assumptions about IO.
 ")
  (depends
   (jsonrpc (= :version))
-  yojson
+  (yojson (< 3.0.0))
   (ppx_yojson_conv_lib (>= "v0.14"))
   (cinaps :with-test)
   (ppx_expect (and (>= v0.17.0) :with-test))
@@ -45,7 +45,7 @@ possible and does not make any assumptions about IO.
  (synopsis "LSP Server for OCaml")
  (description "An LSP server for OCaml.")
  (depends
-  yojson
+  (yojson (< 3.0.0))
   (base (>= v0.16.0))
   (lsp (= :version))
   (jsonrpc (= :version))
diff --git a/lsp.opam b/lsp.opam
index 2ae4b8101..955469ce0 100644
--- a/lsp.opam
+++ b/lsp.opam
@@ -25,7 +25,7 @@ bug-reports: "https://github.com/ocaml/ocaml-lsp/issues"
 depends: [
   "dune" {>= "3.0"}
   "jsonrpc" {= version}
-  "yojson"
+  "yojson" {< "3.0.0"}
   "ppx_yojson_conv_lib" {>= "v0.14"}
   "cinaps" {with-test}
   "ppx_expect" {>= "v0.17.0" & with-test}
diff --git a/ocaml-lsp-server.opam b/ocaml-lsp-server.opam
index 8710e83ff..8cfaf16b4 100644
--- a/ocaml-lsp-server.opam
+++ b/ocaml-lsp-server.opam
@@ -20,7 +20,7 @@ homepage: "https://github.com/ocaml/ocaml-lsp"
 bug-reports: "https://github.com/ocaml/ocaml-lsp/issues"
 depends: [
   "dune" {>= "3.0"}
-  "yojson"
+  "yojson" {< "3.0.0"}
   "base" {>= "v0.16.0"}
   "lsp" {= version}
   "jsonrpc" {= version}