diff --git a/pkgs/development/ocaml-modules/easy-format/default.nix b/pkgs/development/ocaml-modules/easy-format/default.nix
index df1b30dd647a..d65b5863e86e 100644
--- a/pkgs/development/ocaml-modules/easy-format/default.nix
+++ b/pkgs/development/ocaml-modules/easy-format/default.nix
@@ -9,8 +9,8 @@ let
   params =
     if lib.versionAtLeast ocaml.version "4.08" then
       {
-        version = "1.3.3";
-        sha256 = "sha256:05n4mm1yz33h9gw811ivjw7x4m26lpmf7kns9lza4v6227lwmz7a";
+        version = "1.3.4";
+        sha256 = "sha256-Hb8FHp9oV03ebi4lSma5xSTKQl6As26Zr5btlkq2EMM=";
       }
     else
       {