diff --git a/.github/workflows/erlang.yml b/.github/workflows/erlang.yml
index 7b4094d..3c7507b 100644
--- a/.github/workflows/erlang.yml
+++ b/.github/workflows/erlang.yml
@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        otp: ['23.3', '24.3', '25.2.1']
+        otp: ['25.2.1']
         rebar: ['3.20.0']
 
     steps:
diff --git a/rebar.config b/rebar.config
index dfc6d17..95fd8db 100644
--- a/rebar.config
+++ b/rebar.config
@@ -11,7 +11,9 @@
 
 {profiles, [{test, [{deps, [{meck, "~> 0.9.2"}]}]}]}.
 
-{dialyzer, [{warnings, [no_return, unmatched_returns, error_handling, underspecs]}]}.
+{dialyzer,
+ [{warnings,
+   [no_return, unmatched_returns, error_handling, missing_return, extra_return]}]}.
 
 {edoc_opts,
  [{todo, true},
diff --git a/src/rebar3_depup_prv.erl b/src/rebar3_depup_prv.erl
index 437429e..912630e 100644
--- a/src/rebar3_depup_prv.erl
+++ b/src/rebar3_depup_prv.erl
@@ -56,7 +56,7 @@ opts() ->
       "Only update if the specified SemVer component (major, minor, or patch) has changed."}].
 
 %% @private
--spec do(rebar_state:t()) -> {ok, rebar_state:t()}.
+-spec do(rebar_state:t()) -> {ok, rebar_state:t()} | {error, iodata()}.
 do(State) ->
     Opts = parse_opts(State),
     rebar_api:debug("Opts: ~p", [Opts]),
@@ -87,8 +87,14 @@ do(State) ->
 %% @private
 -spec format_error(any()) -> binary().
 format_error(Reason) ->
-    unicode:characters_to_binary(
-        io_lib:format("~tp", [Reason])).
+    case unicode:characters_to_binary(
+             io_lib:format("~tp", [Reason]))
+    of
+        {_Error, Bin, _Rest} ->
+            Bin;
+        Bin ->
+            Bin
+    end.
 
 parse_opts(State) ->
     {Args, _} = rebar_state:command_parsed_args(State),