diff --git a/pkgs/development/beam-modules/erlang-ls/default.nix b/pkgs/development/beam-modules/erlang-ls/default.nix
index 813ddebef43d..236c54136c8a 100644
--- a/pkgs/development/beam-modules/erlang-ls/default.nix
+++ b/pkgs/development/beam-modules/erlang-ls/default.nix
@@ -1,7 +1,7 @@
 { fetchFromGitHub, fetchgit, fetchHex, rebar3Relx, buildRebar3, rebar3-proper
 , stdenv, writeScript, lib }:
 let
-  version = "0.24.0";
+  version = "0.29.0";
   owner = "erlang-ls";
   repo = "erlang_ls";
   deps = import ./rebar-deps.nix {
@@ -19,7 +19,7 @@ rebar3Relx {
   inherit version;
   src = fetchFromGitHub {
     inherit owner repo;
-    sha256 = "sha256-fKe6vsY40lexnkUP4PEsc53WFaUAw5LGLEC/zJauogg=";
+    sha256 = "sha256-BWI7H5HU5ZgXrMWFOZ7WpTfS6syrFpEVRInZW6hC5iE=";
     rev = version;
   };
   releaseType = "escript";
diff --git a/pkgs/development/beam-modules/erlang-ls/rebar-deps.nix b/pkgs/development/beam-modules/erlang-ls/rebar-deps.nix
index 9d1fa9aef067..18de8cfc72af 100644
--- a/pkgs/development/beam-modules/erlang-ls/rebar-deps.nix
+++ b/pkgs/development/beam-modules/erlang-ls/rebar-deps.nix
@@ -66,11 +66,12 @@ let
     };
     yamerl = builder {
       name = "yamerl";
-      version = "0.8.1";
-      src = fetchHex {
-        pkg = "yamerl";
-        version = "0.8.1";
-        sha256 = "sha256-lssw+dZDRP7Q74qS6fFvIH3mwE3/9PNmdSynn1vOsj8=";
+      version = "git";
+      src = fetchFromGitHub {
+        owner = "erlang-ls";
+        repo = "yamerl";
+        rev = "9a9f7a2e84554992f2e8e08a8060bfe97776a5b7";
+        sha256 = "1gb44v27paxwxm443m5f554wiziqi2kd300hgjjdg6fyvy3mvhss";
       };
       beamDeps = [ ];
     };
@@ -130,8 +131,8 @@ let
       src = fetchFromGitHub {
         owner = "josefs";
         repo = "gradualizer";
-        rev = "e93db1c6725760def005c69d72f53b1a889b4c2f";
-        sha256 = "0i1mh0dw2qknrjwpbxhgpwspqv12bznylv17sznid3kbb31pslay";
+        rev = "6e89b4e1cd489637a848cc5ca55058c8a241bf7d";
+        sha256 = "1ix0xgd0267ibx6y68fx4pq8q3j0y7rjs7j3cv3v2gdiy190psy9";
       };
       beamDeps = [ ];
     };