diff --git a/.ocamlformat b/.ocamlformat
index 87d74bf8..ba6cf01a 100644
--- a/.ocamlformat
+++ b/.ocamlformat
@@ -1,4 +1,4 @@
-version = 0.26.2
+version = 0.27.0
 profile=conventional
 margin=80
 if-then-else=k-r
diff --git a/dune-project b/dune-project
index 76d8ffc9..ae7049aa 100644
--- a/dune-project
+++ b/dune-project
@@ -43,8 +43,8 @@
   (ocamlformat
    (and
     :with-dev-setup
-    (>= 0.24)
-    (< 0.25))))
+    (>= 0.27)
+    (< 0.28))))
  (depopts trace lwt eio)
  (conflicts
   (trace
diff --git a/opentelemetry.opam b/opentelemetry.opam
index 71f83175..c5fddf66 100644
--- a/opentelemetry.opam
+++ b/opentelemetry.opam
@@ -23,7 +23,7 @@ depends: [
   "alcotest" {with-test}
   "pbrt" {>= "3.0" & < "4.0"}
   "ocaml-lsp-server" {with-dev-setup}
-  "ocamlformat" {with-dev-setup & >= "0.24" & < "0.25"}
+  "ocamlformat" {with-dev-setup & >= "0.27" & < "0.28"}
 ]
 depopts: ["trace" "lwt" "eio"]
 conflicts: [