diff --git a/pkgs/development/compilers/ocaml/5.5.nix b/pkgs/development/compilers/ocaml/5.5.nix
index 8ed4b494db7c..704a00a50cfa 100644
--- a/pkgs/development/compilers/ocaml/5.5.nix
+++ b/pkgs/development/compilers/ocaml/5.5.nix
@@ -1,6 +1,6 @@
 import ./generic.nix {
   major_version = "5";
   minor_version = "5";
-  patch_version = "0";
-  sha256 = "sha256-/MauZl0exR1SUQ6qx4NKhqmAa/WiWLt8ynhzP8zwFbo=";
+  patch_version = "1";
+  sha256 = "sha256-zQqXvb/JnwD1P07khJGWTHNievsJ7Y5N4jC6RIij1rk=";
 }
diff --git a/pkgs/development/tools/ocaml/merlin/4.x.nix b/pkgs/development/tools/ocaml/merlin/4.x.nix
index 5358e4aed773..b8b250bcb330 100644
--- a/pkgs/development/tools/ocaml/merlin/4.x.nix
+++ b/pkgs/development/tools/ocaml/merlin/4.x.nix
@@ -35,6 +35,7 @@
       "5.4.0" = "5.7.1-504";
       "5.4.1" = "5.7.1-504";
       "5.5.0" = "5.8-505";
+      "5.5.1" = "5.8-505";
     }
     ."${ocaml.version}",
 }: