diff --git a/rebar.config b/rebar.config
index ce42703e..d1348592 100644
--- a/rebar.config
+++ b/rebar.config
@@ -8,7 +8,7 @@
         {providers,           "1.8.1"},
         {getopt,              "1.0.1"},
         {bbmustache,          "1.10.0"},
-        {relx,                "4.0.0-rc2"},
+        {relx,                {git, "https://github.com/erlware/relx.git", {branch, "master"}}},
         {cf,                  "0.3.1"},
         {cth_readable,        "1.4.8"},
         {eunit_formatters,    "0.5.0"}]}.
diff --git a/rebar.lock b/rebar.lock
index e7666257..fbad069a 100644
--- a/rebar.lock
+++ b/rebar.lock
@@ -8,7 +8,10 @@
  {<<"getopt">>,{pkg,<<"getopt">>,<<"1.0.1">>},0},
  {<<"parse_trans">>,{pkg,<<"parse_trans">>,<<"3.3.0">>},0},
  {<<"providers">>,{pkg,<<"providers">>,<<"1.8.1">>},0},
- {<<"relx">>,{pkg,<<"relx">>,<<"4.0.0-rc2">>},0},
+ {<<"relx">>,
+  {git,"https://github.com/erlware/relx.git",
+       {ref,"96182ede21c7bbe23c2708514b4a42de0d974d5f"}},
+  0},
  {<<"ssl_verify_fun">>,{pkg,<<"ssl_verify_fun">>,<<"1.1.6">>},0}]}.
 [
 {pkg_hash,[
@@ -21,7 +24,6 @@
  {<<"getopt">>, <<"C73A9FA687B217F2FF79F68A3B637711BB1936E712B521D8CE466B29CBF7808A">>},
  {<<"parse_trans">>, <<"09765507A3C7590A784615CFD421D101AEC25098D50B89D7AA1D66646BC571C1">>},
  {<<"providers">>, <<"70B4197869514344A8A60E2B2A4EF41CA03DEF43CFB1712ECF076A0F3C62F083">>},
- {<<"relx">>, <<"6031ED37FB496435FA992E52E540C22020B6678C9FA541CD748F987AD9D732D7">>},
  {<<"ssl_verify_fun">>, <<"CF344F5692C82D2CD7554F5EC8FD961548D4FD09E7D22F5B62482E5AEAEBD4B0">>}]},
 {pkg_hash_ext,[
  {<<"bbmustache">>, <<"43EFFA3FD4BB9523157AF5A9E2276C493495B8459FC8737144AA186CB13CE2EE">>},
@@ -33,6 +35,5 @@
  {<<"getopt">>, <<"53E1AB83B9CEB65C9672D3E7A35B8092E9BDC9B3EE80721471A161C10C59959C">>},
  {<<"parse_trans">>, <<"17EF63ABDE837AD30680EA7F857DD9E7CED9476CDD7B0394432AF4BFC241B960">>},
  {<<"providers">>, <<"E45745ADE9C476A9A469EA0840E418AB19360DC44F01A233304E118A44486BA0">>},
- {<<"relx">>, <<"7DF43DC485821DC5B7EBC4C43487A06F68769F1406C12D6EC47FC6A3889F23D4">>},
  {<<"ssl_verify_fun">>, <<"BDB0D2471F453C88FF3908E7686F86F9BE327D065CC1EC16FA4540197EA04680">>}]}
 ].
diff --git a/src/rebar_app_info.erl b/src/rebar_app_info.erl
index b344f809..47efbfda 100644
--- a/src/rebar_app_info.erl
+++ b/src/rebar_app_info.erl
@@ -176,13 +176,20 @@ new(Parent, AppName, Vsn, Dir, Deps) ->
                      ebin_dir=filename:join(rebar_utils:to_list(Dir), "ebin"),
                      deps=Deps}}.
 
+-spec app_to_map(t()) -> #{name := atom(),
+                           vsn := string(),
+                           applications := [atom()],
+                           included_applications := [atom()],
+                           dir := file:name(),
+                           out_dir := file:name(),
+                           ebin_dir := file:name(),
+                           link := boolean()}.
 app_to_map(#app_info_t{name=Name,
                        vsn=Vsn,
                        applications=Applications,
                        included_applications=IncludedApplications,
                        out_dir=OutDir,
                        ebin_dir=EbinDir}) ->
-    %% TODO: call rlx_app_info to create map
     #{name => ec_cnv:to_atom(Name),
       vsn => Vsn,
       applications => Applications,
diff --git a/src/rebar_relx.erl b/src/rebar_relx.erl
index 0dc93b03..109d9a5c 100644
--- a/src/rebar_relx.erl
+++ b/src/rebar_relx.erl
@@ -155,13 +155,26 @@ merge_overlays(Config) ->
 %% This means the project apps and dependencies but not OTP libraries.
 -spec all_apps(rebar_state:t()) -> #{atom() => rlx_app_info:t()}.
 all_apps(State) ->
-    lists:foldl(fun(AppInfo, Acc) ->
-                        Acc#{binary_to_atom(rebar_app_info:name(AppInfo), utf8)
-                             => rebar_app_info:app_to_map(AppInfo)}
-                end, #{}, rebar_state:project_apps(State) ++ rebar_state:all_deps(State)).
+    maps:merge(app_infos_to_relx(rebar_state:project_apps(State), project),
+               app_infos_to_relx(rebar_state:all_deps(State), dep)).
 
 %%
 
+-spec app_infos_to_relx([rlx_app_info:t()], rlx_app_info:app_type()) -> #{atom() => rlx_app_info:t()}.
+app_infos_to_relx(AppInfos, AppType) ->
+    lists:foldl(fun(AppInfo, Acc) ->
+                        Acc#{binary_to_atom(rebar_app_info:name(AppInfo), utf8)
+                             => app_info_to_relx(rebar_app_info:app_to_map(AppInfo), AppType)}
+                end, #{}, AppInfos).
+
+app_info_to_relx(#{name := Name,
+                   vsn := Vsn,
+                   applications := Applications,
+                   included_applications := IncludedApplications,
+                   dir := Dir,
+                   link := false}, AppType) ->
+    rlx_app_info:new(Name, Vsn, Dir, Applications, IncludedApplications, AppType).
+
 -spec opt_spec_list() -> [getopt:option_spec()].
 opt_spec_list() ->
     [{all, undefined, "all",  boolean,