diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 02678c2..2225e8a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,9 +17,14 @@ concurrency:
 
 jobs:
   ci:
-    name: CI
+    name: CI OTP-${{matrix.otp-version}}
 
-    runs-on: ubuntu-24.04
+    runs-on: ${{matrix.os}}
+
+    strategy:
+      matrix:
+        otp-version: [24, 25, 26, 27]
+        os: [ubuntu-24.04]
 
     steps:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
@@ -27,8 +32,8 @@ jobs:
       - uses: erlef/setup-beam@b9c58b0450cd832ccdb3c17cc156a47065d2114f # v1.18.1
         id: setup-beam
         with:
-          version-type: strict
-          version-file: .tool-versions
+          otp-version: ${{matrix.otp-version}}
+          rebar3-version: 3.23.0
 
       - name: Restore _build
         uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
@@ -50,7 +55,13 @@ jobs:
                 -rebar3-${{steps.setup-beam.outputs.rebar3-version}}\
                 -hash-${{hashFiles('rebar.lock')}}"
 
+      - name: Continuous Integration (Polyfill)
+        if: ${{fromJSON(matrix.otp-version) < 27}}
+        run: |
+          rebar3 as test polyfill_ci
+
       - name: Continuous Integration
+        if: ${{fromJSON(matrix.otp-version) >= 27}}
         run: |
           rebar3 as test ci
 
diff --git a/.tool-versions b/.tool-versions
deleted file mode 100644
index 1ae24a9..0000000
--- a/.tool-versions
+++ /dev/null
@@ -1,2 +0,0 @@
-erlang 27.0.1
-rebar 3.23.0
diff --git a/rebar.config b/rebar.config
index b308a8a..e0cc173 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,3 +1,5 @@
+{minimum_otp_vsn, "24"}.
+
 {erl_opts, [
     debug_info,
     warnings_as_errors,
@@ -13,8 +15,7 @@
     {warnings, [
         unknown,
         unmatched_returns
-    ]},
-    incremental
+    ]}
 ]}.
 
 {deps, []}.
@@ -81,6 +82,7 @@
             ]}
         ]},
         {deps, [
+            {json_polyfill, "0.1.3"},
             {doctest, "0.9.3"},
             {jiffy, "1.1.2"},
             {thoas, "1.2.1"}
@@ -117,6 +119,13 @@
         ct,
         {cover, "--min_coverage 100"},
         ex_doc
+    ]},
+    {polyfill_ci, [
+        lint,
+        hank,
+        xref,
+        eunit,
+        ct
     ]}
 ]}.
 
diff --git a/src/euneus.erl b/src/euneus.erl
index d8d2cf2..ac34a0f 100644
--- a/src/euneus.erl
+++ b/src/euneus.erl
@@ -32,9 +32,11 @@
 %% DocTest
 %% --------------------------------------------------------------------
 
+-if(?OTP_RELEASE >= 27).
 -ifdef(TEST).
 -include_lib("doctest/include/doctest.hrl").
 -endif.
+-endif.
 
 %% --------------------------------------------------------------------
 %% API functions
diff --git a/src/euneus_decoder.erl b/src/euneus_decoder.erl
index d6043cc..4806212 100644
--- a/src/euneus_decoder.erl
+++ b/src/euneus_decoder.erl
@@ -77,9 +77,11 @@
 %% DocTest
 %% --------------------------------------------------------------------
 
+-if(?OTP_RELEASE >= 27).
 -ifdef(TEST).
 -include_lib("doctest/include/doctest.hrl").
 -endif.
+-endif.
 
 %% --------------------------------------------------------------------
 %% API functions
diff --git a/src/euneus_encoder.erl b/src/euneus_encoder.erl
index 32e0a4c..217e65c 100644
--- a/src/euneus_encoder.erl
+++ b/src/euneus_encoder.erl
@@ -105,9 +105,11 @@
 %% DocTest
 %% --------------------------------------------------------------------
 
+-if(?OTP_RELEASE >= 27).
 -ifdef(TEST).
 -include_lib("doctest/include/doctest.hrl").
 -endif.
+-endif.
 
 %% --------------------------------------------------------------------
 %% API functions
@@ -491,8 +493,13 @@ encode_term(Term, Encode, State) ->
 encode_integer(Int, _Encode, _State) ->
     erlang:integer_to_binary(Int, 10).
 
+-if(?OTP_RELEASE >= 25).
 encode_float(Float, _Encode, _State) ->
     erlang:float_to_binary(Float, [short]).
+-else.
+encode_float(Float, _Encode, _State) ->
+    erlang:float_to_binary(Float, [compact, {decimals, 10}]).
+-endif.
 
 encode_atom(true, _Encode, _State) ->
     <<"true">>;
@@ -537,17 +544,48 @@ is_proplist_prop({Key, _}) ->
 is_proplist_prop(Key) ->
     is_atom(Key).
 
+-if(?OTP_RELEASE >= 26).
 encode_map(Map, Encode, #state{sort_keys = false, skip_values = ValuesToSkip} = State) ->
     do_encode_map([
         [$,, escape_map_key(Key, State), $: | encode_term(Value, Encode, State)]
      || Key := Value <- Map,
         not is_map_key(Value, ValuesToSkip)
     ]);
-encode_map(Map, Encode, #state{sort_keys = true, skip_values = ValuesToSkip} = State) ->
+encode_map(Map, Encode, State) ->
+    encode_sort_keys_map(Map, Encode, State).
+-else.
+encode_map(Map, Encode, #state{sort_keys = false, skip_values = ValuesToSkip} = State) ->
+    do_encode_map(
+        maps:fold(
+            fun(Key, Value, Acc) ->
+                case is_map_key(Value, ValuesToSkip) of
+                    true ->
+                        [];
+                    false ->
+                        [
+                            [
+                                $,,
+                                escape_map_key(Key, State),
+                                $:
+                                | encode_term(Value, Encode, State)
+                            ]
+                            | Acc
+                        ]
+                end
+            end,
+            [],
+            Map
+        )
+    );
+encode_map(Map, Encode, State) ->
+    encode_sort_keys_map(Map, Encode, State).
+-endif.
+
+encode_sort_keys_map(Map, Encode, #state{sort_keys = true} = State) ->
     do_encode_map([
         [$,, escape_map_key(Key, State), $: | encode_term(Value, Encode, State)]
      || {Key, Value} <- lists:keysort(1, maps:to_list(Map)),
-        not is_map_key(Value, ValuesToSkip)
+        not is_map_key(Value, State#state.skip_values)
     ]).
 
 escape_map_key(Key, State) ->
diff --git a/test/euneus_encoder_SUITE.erl b/test/euneus_encoder_SUITE.erl
index bc6fd65..5d05ab3 100644
--- a/test/euneus_encoder_SUITE.erl
+++ b/test/euneus_encoder_SUITE.erl
@@ -3,6 +3,10 @@
 -include_lib("stdlib/include/assert.hrl").
 -compile([export_all, nowarn_export_all]).
 
+%
+
+-elvis([{elvis_style, dont_repeat_yourself, disable}]).
+
 %% --------------------------------------------------------------------
 %% Behaviour (ct_suite) callbacks
 %% --------------------------------------------------------------------
@@ -86,6 +90,7 @@ ipv6_codec_test(Config) when is_list(Config) ->
 
 -record(foo, {foo, bar}).
 -record(bar, {bar, baz}).
+-if(?OTP_RELEASE >= 26).
 records_codec_test(Config) when is_list(Config) ->
     [
         ?assertError(
@@ -116,6 +121,38 @@ records_codec_test(Config) when is_list(Config) ->
             )
         )
     ].
+-else.
+records_codec_test(Config) when is_list(Config) ->
+    [
+        ?assertError(
+            unsuported_tuple,
+            encode({foo, bar, baz, qux}, #{
+                codecs => [
+                    {records, #{
+                        foo => {record_info(fields, foo), record_info(size, foo)}
+                    }}
+                ]
+            })
+        ),
+        ?assertEqual(
+            <<"[{\"foo\":\"foo\",\"bar\":\"bar\"},{\"baz\":\"baz\",\"bar\":\"bar\"}]">>,
+            encode(
+                [
+                    #foo{foo = foo, bar = bar},
+                    #bar{bar = bar, baz = baz}
+                ],
+                #{
+                    codecs => [
+                        {records, #{
+                            foo => {record_info(fields, foo), record_info(size, foo)},
+                            bar => {record_info(fields, bar), record_info(size, bar)}
+                        }}
+                    ]
+                }
+            )
+        )
+    ].
+-endif.
 
 nulls_test(Config) when is_list(Config) ->
     [
@@ -132,6 +169,7 @@ skip_values_test(Config) when is_list(Config) ->
         )
     ].
 
+-if(?OTP_RELEASE >= 26).
 key_to_binary_test(Config) when is_list(Config) ->
     [
         ?assertEqual(
@@ -148,6 +186,24 @@ key_to_binary_test(Config) when is_list(Config) ->
             encode(#{foo => world}, #{key_to_binary => fun(_) -> <<"hello">> end})
         )
     ].
+-else.
+key_to_binary_test(Config) when is_list(Config) ->
+    [
+        ?assertEqual(
+            <<"{\"foo\":\"foo\",\"baz\":\"baz\",\"bar\":\"bar\",\"0\":0}">>,
+            encode(#{
+                <<"foo">> => foo,
+                bar => bar,
+                "baz" => baz,
+                0 => 0
+            })
+        ),
+        ?assertEqual(
+            <<"{\"hello\":\"world\"}">>,
+            encode(#{foo => world}, #{key_to_binary => fun(_) -> <<"hello">> end})
+        )
+    ].
+-endif.
 
 sort_keys_test(Config) when is_list(Config) ->
     [
@@ -158,6 +214,7 @@ sort_keys_test(Config) when is_list(Config) ->
         )
     ].
 
+-if(?OTP_RELEASE >= 26).
 proplists_test(Config) when is_list(Config) ->
     [
         ?assertEqual(<<"[]">>, encode([], #{proplists => true})),
@@ -176,6 +233,26 @@ proplists_test(Config) when is_list(Config) ->
             })
         )
     ].
+-else.
+proplists_test(Config) when is_list(Config) ->
+    [
+        ?assertEqual(<<"[]">>, encode([], #{proplists => true})),
+        ?assertEqual(
+            <<"[null,{\"foo\":\"bar\",\"baz\":true,\"0\":0}]">>,
+            encode([null, [{foo, bar}, baz, {0, 0}]], #{proplists => true})
+        ),
+        ?assertEqual(
+            <<"[null,{\"foo\":\"bar\"}]">>,
+            encode([null, [{foo, bar}]], #{
+                proplists =>
+                    {true, fun
+                        ([{_, _}]) -> true;
+                        (_) -> false
+                    end}
+            })
+        )
+    ].
+-endif.
 
 escape_test(Config) when is_list(Config) ->
     ?assertEqual(<<"bar">>, encode(foo, #{escape => fun(_) -> <<"bar">> end})).