diff --git a/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix b/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix
index 451b9e7f0d88..2ec0ec5ab60c 100644
--- a/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix
+++ b/pkgs/development/ocaml-modules/ocaml-lsp/jsonrpc.nix
@@ -10,7 +10,7 @@
   ocaml,
   version ?
     if lib.versionAtLeast ocaml.version "5.3" then
-      "1.22.0"
+      "1.23.0"
     else if lib.versionAtLeast ocaml.version "5.2" then
       "1.21.0"
     else if lib.versionAtLeast ocaml.version "4.14" then
@@ -26,6 +26,11 @@
 let
   params =
     {
+      "1.23.0" = {
+        name = "lsp";
+        minimalOCamlVersion = "5.3";
+        sha256 = "sha256-fyvQI7VKgOrOFihtKIkcE2B2iUYFLJOZGKipzZU0Dn0=";
+      };
       "1.22.0" = {
         name = "lsp";
         minimalOCamlVersion = "5.2";
diff --git a/pkgs/development/ocaml-modules/ocaml-lsp/lsp.nix b/pkgs/development/ocaml-modules/ocaml-lsp/lsp.nix
index d9c5df1c63f5..c50fd2405c91 100644
--- a/pkgs/development/ocaml-modules/ocaml-lsp/lsp.nix
+++ b/pkgs/development/ocaml-modules/ocaml-lsp/lsp.nix
@@ -24,7 +24,7 @@
   ocaml,
   version ?
     if lib.versionAtLeast ocaml.version "5.3" then
-      "1.22.0"
+      "1.23.0"
     else if lib.versionAtLeast ocaml.version "5.2" then
       "1.21.0"
     else if lib.versionAtLeast ocaml.version "4.14" then
diff --git a/pkgs/development/tools/ocaml/merlin/4.x.nix b/pkgs/development/tools/ocaml/merlin/4.x.nix
index a7673d2427ff..9f7446cfc746 100644
--- a/pkgs/development/tools/ocaml/merlin/4.x.nix
+++ b/pkgs/development/tools/ocaml/merlin/4.x.nix
@@ -20,15 +20,15 @@
       "4.12.1" = "4.7-412";
       "4.13.0" = "4.7-413";
       "4.13.1" = "4.7-413";
-      "4.14.0" = "4.18-414";
-      "4.14.1" = "4.18-414";
-      "4.14.2" = "4.18-414";
+      "4.14.0" = "4.19-414";
+      "4.14.1" = "4.19-414";
+      "4.14.2" = "4.19-414";
       "5.0.0" = "4.14-500";
       "5.1.0" = "4.17.1-501";
       "5.1.1" = "4.17.1-501";
       "5.2.0" = "5.3-502";
       "5.2.1" = "5.3-502";
-      "5.3.0" = "5.4.1-503";
+      "5.3.0" = "5.5-503";
     }
     ."${ocaml.version}",
 }:
@@ -42,9 +42,11 @@ let
     "4.16-414" = "sha256-xekZdfPfVoSeGzBvNWwxcJorE519V2NLjSHkcyZvzy0="; # Used by ocaml-lsp
     "4.16-501" = "sha256-2lvzCbBAZFwpKuRXLMagpwDb0rz8mWrBPI5cODbCHiY="; # Used by ocaml-lsp
     "4.18-414" = "sha256-9tb3omYUHjWMGoaWEsgTXIWRhdVH6julya17tn/jDME=";
+    "4.19-414" = "sha256-YKYw9ZIDqc5wR6XwTQ8jmUWWDaxvOBApIuMottJlc4Q=";
     "4.17.1-501" = "sha256-N2cHqocfCeljlFbT++S4miHJrXXHdOlMu75n+EKwpQA=";
     "5.3-502" = "sha256-LOpG8SOX+m4x7wwNT14Rwc/ZFu5JQgaUAFyV67OqJLw=";
     "5.4.1-503" = "sha256-SbO0x3jBISX8dAXnN5CwsxLV15dJ3XPUg4tlYqJTMCI=";
+    "5.5-503" = "sha256-Z9o7NPL+oHZ4JnMJ9h2kosbwgpjeDcWWVbjTD9gmmvE=";
   };
 
 in