diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 83a4beef..9ce18d07 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,10 +11,10 @@ jobs:
     name: ${{ matrix.test-type }} test on OTP ${{matrix.otp_vsn}}
     strategy:
       matrix:
-        otp_vsn: ['26.2', '25.3', '24.3']
-        rebar_vsn: ['3.22.0']
+        otp_vsn: ['27', '26', '25']
+        rebar_vsn: ['3.23.0']
         test-type: ['regular', 'integration']
-    runs-on: 'ubuntu-22.04'
+    runs-on: 'ubuntu-24.04'
     steps:
       - uses: actions/checkout@v4
       - uses: erlef/setup-beam@v1
diff --git a/src/throttle/amoc_throttle_process.erl b/src/throttle/amoc_throttle_process.erl
index 4ca00a43..9c308ee7 100644
--- a/src/throttle/amoc_throttle_process.erl
+++ b/src/throttle/amoc_throttle_process.erl
@@ -143,12 +143,13 @@ handle_continue(maybe_run_fn, State) ->
     NewState = maybe_run_fn(State),
     {noreply, NewState, timeout(NewState)}.
 
--spec format_status(gen_server:format_status()) -> term().
-format_status(#{state := State}) ->
+-spec format_status(gen_server:format_status()) -> gen_server:format_status().
+format_status(FormatStatus = #{state := State}) ->
     ScheduleLen = length(State#state.schedule),
     ScheduleRevLen = length(State#state.schedule_reversed),
     State1 = setelement(#state.schedule, State, ScheduleLen),
-    setelement(#state.schedule_reversed, State1, ScheduleRevLen).
+    State2 = setelement(#state.schedule_reversed, State1, ScheduleRevLen),
+    FormatStatus#{state := State2}.
 
 %%------------------------------------------------------------------------------
 %% internal functions