diff --git a/RELNOTES.md b/RELNOTES.md
index 8b51d31f..5837303a 100644
--- a/RELNOTES.md
+++ b/RELNOTES.md
@@ -1,8 +1,10 @@
 Release Notes
 =============
 
+* [2.4.1](https://github.com/basho/riak-erlang-client/issues?q=milestone%3Ariak-erlang-client-2.4.1)
+ * OTP 19 support via updated dependencies and a few platform defines
 * [2.4.0](https://github.com/basho/riak-erlang-client/issues?q=milestone%3Ariak-erlang-client-2.4.0)
  * This release merges in the Riak timeseries code base from the `2.3.1-timeseries` and `2.3.2-timeseries` releases.
 * [2.1.2](https://github.com/basho/riak-erlang-client/issues?q=milestone%3Ariak-erlang-client-2.1.2)
- * OTP 18 / 19 support
+ * OTP 18 support
  * Fix processing of response from Riak when Riak generates an object's key [PR](https://github.com/basho/riak-erlang-client/pull/289)
diff --git a/rebar b/rebar
index a543d531..13bcbf9a 100755
Binary files a/rebar and b/rebar differ
diff --git a/rebar.config b/rebar.config
index 163c58e9..916c03f3 100644
--- a/rebar.config
+++ b/rebar.config
@@ -8,11 +8,12 @@
     debug_info,
     warnings_as_errors,
     {platform_define, "^[0-9]+", namespaced_types},
-    {platform_define, "(?=^[0-9]+)(?!^17)", deprecated_now}
+    {platform_define, "(?=^[0-9]+)(?!^17)", deprecated_now},
+    {platform_define, "^19", deprecated_19}
 ]}.
 
 {deps, [
-    {riak_pb, "2.1.*", {git, "git://github.com/basho/riak_pb", {tag, "2.1.4.0"}}}
+    {riak_pb, "2.1.*", {git, "https://github.com/basho/riak_pb", {tag, "2.1.4.1"}}}
 ]}.
 
 {edoc_opts, [
diff --git a/src/riakc_obj.erl b/src/riakc_obj.erl
index 14d063cf..e2bd83e5 100644
--- a/src/riakc_obj.erl
+++ b/src/riakc_obj.erl
@@ -123,17 +123,18 @@
 %% ====================================================================
 
 %% @doc Constructor for new riak client objects.
--spec new(bucket(), key()) -> riakc_obj().
+-spec new(bucket(), key()) -> riakc_obj() | {error, atom()}.
 new(Bucket, Key) ->
     build_client_object(Bucket, Key, undefined).
 
 %% @doc Constructor for new riak client objects with an update value.
--spec new(bucket(), key(), value()) -> riakc_obj().
+-spec new(bucket(), key(), value()) -> riakc_obj() | {error, atom()}.
 new(Bucket, Key, Value) ->
     build_client_object(Bucket, Key, Value).
 
 %% @doc Constructor for new riak client objects with an update value and content type.
--spec new(bucket(), key(), value(), content_type()) -> riakc_obj().
+-spec new(bucket(), key(), value(), content_type()) ->
+    riakc_obj() | {error, atom()}.
 new(Bucket, Key, Value, ContentType) ->
     case build_client_object(Bucket, Key, Value) of
         {error, Reason} ->
@@ -144,7 +145,7 @@ new(Bucket, Key, Value, ContentType) ->
 
 %% @doc Build a new riak client object with non-empty key
 -spec build_client_object(bucket(), key(), undefined | value()) ->
-                                 riakc_obj() | {error, atom()}.
+    riakc_obj() | {error, atom()}.
 build_client_object(<<>>, K, _) when is_binary(K) ->
     {error, zero_length_bucket};
 build_client_object(B, <<>>, _) when is_binary(B) ->
diff --git a/src/riakc_pb_socket.erl b/src/riakc_pb_socket.erl
index a6455fd6..8a7eecd6 100644
--- a/src/riakc_pb_socket.erl
+++ b/src/riakc_pb_socket.erl
@@ -2380,7 +2380,11 @@ remove_queued_request(Ref, State) ->
     end.
 
 %% @private
+-ifdef(deprecated_19).
+mk_reqid() -> erlang:phash2(crypto:strong_rand_bytes(10)). % only has to be unique per-pid
+-else.
 mk_reqid() -> erlang:phash2(crypto:rand_bytes(10)). % only has to be unique per-pid
+-endif.
 
 %% @private
 wait_for_list(ReqId) ->