diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 34db570..5a4ad7b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,4 @@
-# Created with GitHubActions version 0.3.17
+# Created with GitHubActions version 0.4.0
 name: CI
 env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -13,7 +13,7 @@ jobs:
       matrix:
         include:
           - elixir: '1.19.5'
-            otp: '28.3'
+            otp: '28.4'
             coverage: true
             lint: true
           - elixir: '1.19.5'
@@ -28,10 +28,6 @@ jobs:
             otp: '24.3'
           - elixir: '1.15.8'
             otp: '24.3'
-          - elixir: '1.14.5'
-            otp: '24.3'
-          - elixir: '1.13.4'
-            otp: '24.3'
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/CHANGELOG.md b/CHANGELOG.md
index cea0e02..20ac5be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.4.0 2026/03/04
+
+- Add Erlang version `28.4` to config
+- Require Elixir version 1.15
+
 ## 0.3.17 2026/01/09
 
 - Add Elixir version `1.19.5` to config
diff --git a/lib/git_hub_actions/project.ex b/lib/git_hub_actions/project.ex
index e3e832a..8c2671b 100644
--- a/lib/git_hub_actions/project.ex
+++ b/lib/git_hub_actions/project.ex
@@ -15,7 +15,7 @@ defmodule GitHubActions.Project do
   ## Examples
 
       iex> Project.elixir()
-      "~> 1.13"
+      "~> 1.15"
   """
   @spec elixir :: String.t()
   def elixir do
diff --git a/lib/git_hub_actions/versions.ex b/lib/git_hub_actions/versions.ex
index 338dd79..3ec647c 100644
--- a/lib/git_hub_actions/versions.ex
+++ b/lib/git_hub_actions/versions.ex
@@ -63,7 +63,7 @@ defmodule GitHubActions.Versions do
       %GitHubActions.Version{major: 1, minor: 19, patch: 5}
 
       iex> Versions.latest(:otp)
-      %GitHubActions.Version{major: 28, minor: 3}
+      %GitHubActions.Version{major: 28, minor: 4}
   """
   @spec latest(versions() | key()) :: Version.t()
   def latest(versions_or_key) when is_list(versions_or_key) do
@@ -155,7 +155,7 @@ defmodule GitHubActions.Versions do
        "21.0", "21.1", "21.2", "21.3", "22.0", "22.1", "22.2", "22.3", "23.0",
        "23.1", "23.2", "23.3", "24.0", "24.1", "24.2", "24.3", "25.0", "25.1",
        "25.2", "25.3", "26.0", "26.1", "26.2", "27.0", "27.1", "27.2", "27.3",
-       "28.0", "28.1", "28.2", "28.3"
+       "28.0", "28.1", "28.2", "28.3", "28.4"
       ]
   """
   @spec latest_minor(versions_list() | key()) :: [Version.t()]
@@ -242,7 +242,7 @@ defmodule GitHubActions.Versions do
       ["1.19.5"]
 
       iex> Versions.latest_major(:otp) |> Enum.map(&to_string/1)
-      ["17.5", "18.3", "19.3", "20.3", "21.3", "22.3", "23.3", "24.3", "25.3", "26.2", "27.3", "28.3"]
+      ["17.5", "18.3", "19.3", "20.3", "21.3", "22.3", "23.3", "24.3", "25.3", "26.2", "27.3", "28.4"]
   """
   @spec latest_major(versions_list() | key()) :: [Version.t()]
   def latest_major(versions_or_key) when is_list(versions_or_key) do
@@ -738,7 +738,7 @@ defmodule GitHubActions.Versions do
       iex> Enum.map(matrix[:elixir], &to_string/1)
       ["1.12.3", "1.13.4", "1.14.5", "1.15.8", "1.16.3", "1.17.3", "1.18.4", "1.19.5"]
       iex> Enum.map(matrix[:otp], &to_string/1)
-      ["22.3", "23.3", "24.3", "25.3", "26.2", "27.3", "28.3"]
+      ["22.3", "23.3", "24.3", "25.3", "26.2", "27.3", "28.4"]
       iex> for [{k1, v1}, {k2, v2}] <- matrix[:exclude] do
       ...>   [{k1, to_string(v1)}, {k2, to_string(v2)}]
       ...> end
@@ -746,25 +746,25 @@ defmodule GitHubActions.Versions do
         [elixir: "1.12.3", otp: "25.3"],
         [elixir: "1.12.3", otp: "26.2"],
         [elixir: "1.12.3", otp: "27.3"],
-        [elixir: "1.12.3", otp: "28.3"],
+        [elixir: "1.12.3", otp: "28.4"],
         [elixir: "1.13.4", otp: "26.2"],
         [elixir: "1.13.4", otp: "27.3"],
-        [elixir: "1.13.4", otp: "28.3"],
+        [elixir: "1.13.4", otp: "28.4"],
         [elixir: "1.14.5", otp: "22.3"],
         [elixir: "1.14.5", otp: "27.3"],
-        [elixir: "1.14.5", otp: "28.3"],
+        [elixir: "1.14.5", otp: "28.4"],
         [elixir: "1.15.8", otp: "22.3"],
         [elixir: "1.15.8", otp: "23.3"],
         [elixir: "1.15.8", otp: "27.3"],
-        [elixir: "1.15.8", otp: "28.3"],
+        [elixir: "1.15.8", otp: "28.4"],
         [elixir: "1.16.3", otp: "22.3"],
         [elixir: "1.16.3", otp: "23.3"],
         [elixir: "1.16.3", otp: "27.3"],
-        [elixir: "1.16.3", otp: "28.3"],
+        [elixir: "1.16.3", otp: "28.4"],
         [elixir: "1.17.3", otp: "22.3"],
         [elixir: "1.17.3", otp: "23.3"],
         [elixir: "1.17.3", otp: "24.3"],
-        [elixir: "1.17.3", otp: "28.3"],
+        [elixir: "1.17.3", otp: "28.4"],
         [elixir: "1.18.4", otp: "22.3"],
         [elixir: "1.18.4", otp: "23.3"],
         [elixir: "1.18.4", otp: "24.3"],
@@ -795,10 +795,10 @@ defmodule GitHubActions.Versions do
         [elixir: "1.18.4", otp: "25.3"],
         [elixir: "1.18.4", otp: "26.2"],
         [elixir: "1.18.4", otp: "27.3"],
-        [elixir: "1.18.4", otp: "28.3"],
+        [elixir: "1.18.4", otp: "28.4"],
         [elixir: "1.19.0", otp: "26.2"],
         [elixir: "1.19.0", otp: "27.3"],
-        [elixir: "1.19.0", otp: "28.3"]
+        [elixir: "1.19.0", otp: "28.4"]
       ]
 
       iex> Versions.matrix([], elixir: ">= 1.9.0", otp: ">= 22.0.0")
diff --git a/mix.exs b/mix.exs
index 1879bb2..3c9fa84 100644
--- a/mix.exs
+++ b/mix.exs
@@ -2,13 +2,13 @@ defmodule GitHubActions.MixProject do
   use Mix.Project
 
   @source_url "https://github.com/hrzndhrn/git_hub_actions"
-  @version "0.3.17"
+  @version "0.4.0"
 
   def project do
     [
       app: :git_hub_actions,
       version: @version,
-      elixir: "~> 1.13",
+      elixir: "~> 1.15",
       name: "GitHubActions",
       description: "A little tool to write GitHub actions in Elixir",
       source_url: @source_url,
diff --git a/mix.lock b/mix.lock
index 6358b6c..df4494e 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,25 +1,25 @@
 %{
   "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
-  "credo": {:hex, :credo, "1.7.15", "283da72eeb2fd3ccf7248f4941a0527efb97afa224bcdef30b4b580bc8258e1c", [:mix], [{:bunt, "~> 0.2.1 or ~> 1.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "291e8645ea3fea7481829f1e1eb0881b8395db212821338e577a90bf225c5607"},
+  "credo": {:hex, :credo, "1.7.17", "f92b6aa5b26301eaa5a35e4d48ebf5aa1e7094ac00ae38f87086c562caf8a22f", [:mix], [{:bunt, "~> 0.2.1 or ~> 1.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "1eb5645c835f0b6c9b5410f94b5a185057bcf6d62a9c2b476da971cde8749645"},
   "dialyxir": {:hex, :dialyxir, "1.4.7", "dda948fcee52962e4b6c5b4b16b2d8fa7d50d8645bbae8b8685c3f9ecb7f5f4d", [:mix], [{:erlex, ">= 0.2.8", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "b34527202e6eb8cee198efec110996c25c5898f43a4094df157f8d28f27d9efe"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.44", "f20830dd6b5c77afe2b063777ddbbff09f9759396500cdbe7523efd58d7a339c", [:mix], [], "hexpm", "4778ac752b4701a5599215f7030989c989ffdc4f6df457c5f36938cc2d2a2750"},
   "erlex": {:hex, :erlex, "0.2.8", "cd8116f20f3c0afe376d1e8d1f0ae2452337729f68be016ea544a72f767d9c12", [:mix], [], "hexpm", "9d66ff9fedf69e49dc3fd12831e12a8a37b76f8651dd21cd45fcf5561a8a7590"},
   "escape": {:hex, :escape, "0.4.1", "065164d0d18a70e75092fc71124978e7b50ac99de69748739e48609825ab1c9e", [:mix], [], "hexpm", "867d641d66ffb1afbb1cdf872eff3c21b1af90fec3d21916b1b5eda51e244158"},
-  "ex_doc": {:hex, :ex_doc, "0.39.3", "519c6bc7e84a2918b737aec7ef48b96aa4698342927d080437f61395d361dcee", [:mix], [{:earmark_parser, "~> 1.4.44", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "0590955cf7ad3b625780ee1c1ea627c28a78948c6c0a9b0322bd976a079996e1"},
+  "ex_doc": {:hex, :ex_doc, "0.40.1", "67542e4b6dde74811cfd580e2c0149b78010fd13001fda7cfeb2b2c2ffb1344d", [:mix], [{:earmark_parser, "~> 1.4.44", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "bcef0e2d360d93ac19f01a85d58f91752d930c0a30e2681145feea6bd3516e00"},
   "excoveralls": {:hex, :excoveralls, "0.18.5", "e229d0a65982613332ec30f07940038fe451a2e5b29bce2a5022165f0c9b157e", [:mix], [{:castore, "~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "523fe8a15603f86d64852aab2abe8ddbd78e68579c8525ae765facc5eae01562"},
   "file_system": {:hex, :file_system, "1.1.1", "31864f4685b0148f25bd3fbef2b1228457c0c89024ad67f7a81a3ffbc0bbad3a", [:mix], [], "hexpm", "7a15ff97dfe526aeefb090a7a9d3d03aa907e100e262a0f8f7746b78f8f87a5d"},
   "glob_ex": {:hex, :glob_ex, "0.1.11", "cb50d3f1ef53f6ca04d6252c7fde09fd7a1cf63387714fe96f340a1349e62c93", [:mix], [], "hexpm", "342729363056e3145e61766b416769984c329e4378f1d558b63e341020525de4"},
   "jason": {:hex, :jason, "1.4.4", "b9226785a9aa77b6857ca22832cffa5d5011a667207eb2a0ad56adb5db443b8a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "c5eb0cab91f094599f94d55bc63409236a8ec69a21a67814529e8d5f6cc90b3b"},
   "makeup": {:hex, :makeup, "1.2.1", "e90ac1c65589ef354378def3ba19d401e739ee7ee06fb47f94c687016e3713d1", [:mix], [{:nimble_parsec, "~> 1.4", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "d36484867b0bae0fea568d10131197a4c2e47056a6fbe84922bf6ba71c8d17ce"},
   "makeup_elixir": {:hex, :makeup_elixir, "1.0.1", "e928a4f984e795e41e3abd27bfc09f51db16ab8ba1aebdba2b3a575437efafc2", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "7284900d412a3e5cfd97fdaed4f5ed389b8f2b4cb49efc0eb3bd10e2febf9507"},
-  "makeup_erlang": {:hex, :makeup_erlang, "1.0.2", "03e1804074b3aa64d5fad7aa64601ed0fb395337b982d9bcf04029d68d51b6a7", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "af33ff7ef368d5893e4a267933e7744e46ce3cf1f61e2dccf53a111ed3aa3727"},
+  "makeup_erlang": {:hex, :makeup_erlang, "1.0.3", "4252d5d4098da7415c390e847c814bad3764c94a814a0b4245176215615e1035", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "953297c02582a33411ac6208f2c6e55f0e870df7f80da724ed613f10e6706afd"},
   "meck": {:hex, :meck, "0.9.2", "85ccbab053f1db86c7ca240e9fc718170ee5bda03810a6292b5306bf31bae5f5", [:rebar3], [], "hexpm", "81344f561357dc40a8344afa53767c32669153355b626ea9fcbc8da6b3045826"},
   "mock": {:hex, :mock, "0.3.9", "10e44ad1f5962480c5c9b9fa779c6c63de9bd31997c8e04a853ec990a9d841af", [:mix], [{:meck, "~> 0.9.2", [hex: :meck, repo: "hexpm", optional: false]}], "hexpm", "9e1b244c4ca2551bb17bb8415eed89e40ee1308e0fbaed0a4fdfe3ec8a4adbd3"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.4.2", "8efba0122db06df95bfaa78f791344a89352ba04baedd3849593bfce4d0dc1c6", [:mix], [], "hexpm", "4b21398942dda052b403bbe1da991ccd03a053668d147d53fb8c4e0efe09c973"},
   "prove": {:hex, :prove, "0.1.7", "bdde734bcb438dddbef25084467125c82c551463d2666ba413d7e034afe44e12", [:mix], [], "hexpm", "59cc22688d3f5c503d4c3fc122cc3f95eca44abc5ac586bd975220bc18387cc2"},
   "recode": {:hex, :recode, "0.8.0", "4e324f608fbac8a01794902703ba04fa1aaab25217108410f7a0cdcecdb1027c", [:mix], [{:escape, "~> 0.1", [hex: :escape, repo: "hexpm", optional: false]}, {:glob_ex, "~> 0.1", [hex: :glob_ex, repo: "hexpm", optional: false]}, {:rewrite, "~> 1.2", [hex: :rewrite, repo: "hexpm", optional: false]}], "hexpm", "c71d24ebb5a460679d55f8e27585f83542787e238f5a317162ee8e77de74ebba"},
   "rewrite": {:hex, :rewrite, "1.2.0", "80220eb14010e175b67c939397e1a8cdaa2c32db6e2e0a9d5e23e45c0414ce21", [:mix], [{:glob_ex, "~> 0.1", [hex: :glob_ex, repo: "hexpm", optional: false]}, {:sourceror, "~> 1.0", [hex: :sourceror, repo: "hexpm", optional: false]}, {:text_diff, "~> 0.1", [hex: :text_diff, repo: "hexpm", optional: false]}], "hexpm", "a1cd702bbb9d51613ab21091f04a386d750fc6f4516b81900df082d78b2d8c50"},
-  "sourceror": {:hex, :sourceror, "1.10.0", "38397dedbbc286966ec48c7af13e228b171332be1ad731974438c77791945ce9", [:mix], [], "hexpm", "29dbdfc92e04569c9d8e6efdc422fc1d815f4bd0055dc7c51b8800fb75c4b3f1"},
+  "sourceror": {:hex, :sourceror, "1.11.0", "df2cdaffdc323e804009ff50b50bb31e6f2d6e116d936ccf22981f592594d624", [:mix], [], "hexpm", "6e26f572bdfc21d7ad397f596b4cfbbf31d7112126fe3e902c120947073231a8"},
   "text_diff": {:hex, :text_diff, "0.1.0", "1caf3175e11a53a9a139bc9339bd607c47b9e376b073d4571c031913317fecaa", [:mix], [], "hexpm", "d1ffaaecab338e49357b6daa82e435f877e0649041ace7755583a0ea3362dbd7"},
   "yamerl": {:hex, :yamerl, "0.10.0", "4ff81fee2f1f6a46f1700c0d880b24d193ddb74bd14ef42cb0bcf46e81ef2f8e", [:rebar3], [], "hexpm", "346adb2963f1051dc837a2364e4acf6eb7d80097c0f53cbdc3046ec8ec4b4e6e"},
 }
diff --git a/priv/config.exs b/priv/config.exs
index 1193572..cc3489c 100644
--- a/priv/config.exs
+++ b/priv/config.exs
@@ -152,7 +152,7 @@ config versions: [
            ]
          ],
          [
-           otp: ["28.0/3"],
+           otp: ["28.0/4"],
            elixir: [
              "1.18.4",
              "1.19.0/5"
diff --git a/test/fixtures/default.yml b/test/fixtures/default.yml
index 34db570..5a4ad7b 100644
--- a/test/fixtures/default.yml
+++ b/test/fixtures/default.yml
@@ -1,4 +1,4 @@
-# Created with GitHubActions version 0.3.17
+# Created with GitHubActions version 0.4.0
 name: CI
 env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -13,7 +13,7 @@ jobs:
       matrix:
         include:
           - elixir: '1.19.5'
-            otp: '28.3'
+            otp: '28.4'
             coverage: true
             lint: true
           - elixir: '1.19.5'
@@ -28,10 +28,6 @@ jobs:
             otp: '24.3'
           - elixir: '1.15.8'
             otp: '24.3'
-          - elixir: '1.14.5'
-            otp: '24.3'
-          - elixir: '1.13.4'
-            otp: '24.3'
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/test/fixtures/global_default.yml b/test/fixtures/global_default.yml
index 34db570..5a4ad7b 100644
--- a/test/fixtures/global_default.yml
+++ b/test/fixtures/global_default.yml
@@ -1,4 +1,4 @@
-# Created with GitHubActions version 0.3.17
+# Created with GitHubActions version 0.4.0
 name: CI
 env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -13,7 +13,7 @@ jobs:
       matrix:
         include:
           - elixir: '1.19.5'
-            otp: '28.3'
+            otp: '28.4'
             coverage: true
             lint: true
           - elixir: '1.19.5'
@@ -28,10 +28,6 @@ jobs:
             otp: '24.3'
           - elixir: '1.15.8'
             otp: '24.3'
-          - elixir: '1.14.5'
-            otp: '24.3'
-          - elixir: '1.13.4'
-            otp: '24.3'
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/test/fixtures/macos.yml b/test/fixtures/macos.yml
index 8ae056d..6ff3d9e 100644
--- a/test/fixtures/macos.yml
+++ b/test/fixtures/macos.yml
@@ -16,7 +16,7 @@ jobs:
         uses: erlef/setup-beam@v1
         with:
           elixir-version: '1.19.5'
-          otp-version: '28.3'
+          otp-version: '28.4'
       - name: Install hex
         run: mix local.hex --force
       - name: Install rebar
diff --git a/test/fixtures/no_comment.yml b/test/fixtures/no_comment.yml
index f746364..1c5c0e1 100644
--- a/test/fixtures/no_comment.yml
+++ b/test/fixtures/no_comment.yml
@@ -12,7 +12,7 @@ jobs:
       matrix:
         include:
           - elixir: '1.19.5'
-            otp: '28.3'
+            otp: '28.4'
             coverage: true
             lint: true
           - elixir: '1.19.5'
@@ -27,10 +27,6 @@ jobs:
             otp: '24.3'
           - elixir: '1.15.8'
             otp: '24.3'
-          - elixir: '1.14.5'
-            otp: '24.3'
-          - elixir: '1.13.4'
-            otp: '24.3'
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/test/fixtures/opt_output.yml b/test/fixtures/opt_output.yml
index 34db570..5a4ad7b 100644
--- a/test/fixtures/opt_output.yml
+++ b/test/fixtures/opt_output.yml
@@ -1,4 +1,4 @@
-# Created with GitHubActions version 0.3.17
+# Created with GitHubActions version 0.4.0
 name: CI
 env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -13,7 +13,7 @@ jobs:
       matrix:
         include:
           - elixir: '1.19.5'
-            otp: '28.3'
+            otp: '28.4'
             coverage: true
             lint: true
           - elixir: '1.19.5'
@@ -28,10 +28,6 @@ jobs:
             otp: '24.3'
           - elixir: '1.15.8'
             otp: '24.3'
-          - elixir: '1.14.5'
-            otp: '24.3'
-          - elixir: '1.13.4'
-            otp: '24.3'
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/test/fixtures/opt_workflow.yml b/test/fixtures/opt_workflow.yml
index 6ac788b..b797171 100644
--- a/test/fixtures/opt_workflow.yml
+++ b/test/fixtures/opt_workflow.yml
@@ -1,2 +1,2 @@
-# Created with GitHubActions version 0.3.17
+# Created with GitHubActions version 0.4.0
 name: CI
diff --git a/test/fixtures/windows.yml b/test/fixtures/windows.yml
index f5a779c..b337291 100644
--- a/test/fixtures/windows.yml
+++ b/test/fixtures/windows.yml
@@ -16,7 +16,7 @@ jobs:
         uses: erlef/setup-beam@v1
         with:
           elixir-version: '1.19.5'
-          otp-version: '28.3'
+          otp-version: '28.4'
       - name: Restore deps
         uses: actions/cache@v4
         with:
diff --git a/test/git_hub_actions/versions_test.exs b/test/git_hub_actions/versions_test.exs
index f5b8ef8..cdf2373 100644
--- a/test/git_hub_actions/versions_test.exs
+++ b/test/git_hub_actions/versions_test.exs
@@ -19,7 +19,7 @@ defmodule GitHubActions.VersionsTest do
 
   test "from_config/0" do
     assert List.last(Versions.from_config()) ==
-             [otp: ["28.0/3"], elixir: ["1.18.4", "1.19.0/5"]]
+             [otp: ["28.0/4"], elixir: ["1.18.4", "1.19.0/5"]]
   end
 
   describe "get/2" do
@@ -202,7 +202,8 @@ defmodule GitHubActions.VersionsTest do
                  "28.0",
                  "28.1",
                  "28.2",
-                 "28.3"
+                 "28.3",
+                 "28.4"
                ]
     end
   end
@@ -374,7 +375,7 @@ defmodule GitHubActions.VersionsTest do
                %Version{major: 25, minor: 3},
                %Version{major: 26, minor: 2},
                %Version{major: 27, minor: 3},
-               %Version{major: 28, minor: 3}
+               %Version{major: 28, minor: 4}
              ]
     end
   end
@@ -562,27 +563,27 @@ defmodule GitHubActions.VersionsTest do
                  elixir: %Version{major: 1, minor: 16, patch: 3}
                ],
                [
-                 otp: %Version{major: 28, minor: 3},
+                 otp: %Version{major: 28, minor: 4},
                  elixir: %Version{major: 1, minor: 12, patch: 3}
                ],
                [
-                 otp: %Version{major: 28, minor: 3},
+                 otp: %Version{major: 28, minor: 4},
                  elixir: %Version{major: 1, minor: 13, patch: 4}
                ],
                [
-                 otp: %Version{major: 28, minor: 3},
+                 otp: %Version{major: 28, minor: 4},
                  elixir: %Version{major: 1, minor: 14, patch: 5}
                ],
                [
-                 otp: %Version{major: 28, minor: 3},
+                 otp: %Version{major: 28, minor: 4},
                  elixir: %Version{major: 1, minor: 15, patch: 8}
                ],
                [
-                 otp: %Version{major: 28, minor: 3},
+                 otp: %Version{major: 28, minor: 4},
                  elixir: %Version{major: 1, minor: 16, patch: 3}
                ],
                [
-                 otp: %Version{major: 28, minor: 3},
+                 otp: %Version{major: 28, minor: 4},
                  elixir: %Version{major: 1, minor: 17, patch: 3}
                ]
              ]
diff --git a/test/git_hub_actions/workflow_test.exs b/test/git_hub_actions/workflow_test.exs
index 17d9155..2ed13a5 100644
--- a/test/git_hub_actions/workflow_test.exs
+++ b/test/git_hub_actions/workflow_test.exs
@@ -58,45 +58,45 @@ defmodule GitHubActions.WorkflowTest do
                           "1.18.4",
                           "1.19.5"
                         ],
-                        otp: ["21.3", "22.3", "23.3", "24.3", "25.3", "26.2", "27.3", "28.3"],
+                        otp: ["21.3", "22.3", "23.3", "24.3", "25.3", "26.2", "27.3", "28.4"],
                         exclude: [
                           [elixir: "1.10.4", otp: "24.3"],
                           [elixir: "1.10.4", otp: "25.3"],
                           [elixir: "1.10.4", otp: "26.2"],
                           [elixir: "1.10.4", otp: "27.3"],
-                          [elixir: "1.10.4", otp: "28.3"],
+                          [elixir: "1.10.4", otp: "28.4"],
                           [elixir: "1.11.4", otp: "25.3"],
                           [elixir: "1.11.4", otp: "26.2"],
                           [elixir: "1.11.4", otp: "27.3"],
-                          [elixir: "1.11.4", otp: "28.3"],
+                          [elixir: "1.11.4", otp: "28.4"],
                           [elixir: "1.12.3", otp: "21.3"],
                           [elixir: "1.12.3", otp: "25.3"],
                           [elixir: "1.12.3", otp: "26.2"],
                           [elixir: "1.12.3", otp: "27.3"],
-                          [elixir: "1.12.3", otp: "28.3"],
+                          [elixir: "1.12.3", otp: "28.4"],
                           [elixir: "1.13.4", otp: "21.3"],
                           [elixir: "1.13.4", otp: "26.2"],
                           [elixir: "1.13.4", otp: "27.3"],
-                          [elixir: "1.13.4", otp: "28.3"],
+                          [elixir: "1.13.4", otp: "28.4"],
                           [elixir: "1.14.5", otp: "21.3"],
                           [elixir: "1.14.5", otp: "22.3"],
                           [elixir: "1.14.5", otp: "27.3"],
-                          [elixir: "1.14.5", otp: "28.3"],
+                          [elixir: "1.14.5", otp: "28.4"],
                           [elixir: "1.15.8", otp: "21.3"],
                           [elixir: "1.15.8", otp: "22.3"],
                           [elixir: "1.15.8", otp: "23.3"],
                           [elixir: "1.15.8", otp: "27.3"],
-                          [elixir: "1.15.8", otp: "28.3"],
+                          [elixir: "1.15.8", otp: "28.4"],
                           [elixir: "1.16.3", otp: "21.3"],
                           [elixir: "1.16.3", otp: "22.3"],
                           [elixir: "1.16.3", otp: "23.3"],
                           [elixir: "1.16.3", otp: "27.3"],
-                          [elixir: "1.16.3", otp: "28.3"],
+                          [elixir: "1.16.3", otp: "28.4"],
                           [elixir: "1.17.3", otp: "21.3"],
                           [elixir: "1.17.3", otp: "22.3"],
                           [elixir: "1.17.3", otp: "23.3"],
                           [elixir: "1.17.3", otp: "24.3"],
-                          [elixir: "1.17.3", otp: "28.3"],
+                          [elixir: "1.17.3", otp: "28.4"],
                           [elixir: "1.18.4", otp: "21.3"],
                           [elixir: "1.18.4", otp: "22.3"],
                           [elixir: "1.18.4", otp: "23.3"],
@@ -149,15 +149,13 @@ defmodule GitHubActions.WorkflowTest do
                   strategy: [
                     matrix: [
                       include: [
-                        [elixir: "1.19.5", otp: "28.3", coverage: "true", lint: "true"],
+                        [elixir: "1.19.5", otp: "28.4", coverage: "true", lint: "true"],
                         [elixir: "1.19.5", otp: "27.3"],
                         [elixir: "1.19.5", otp: "26.2"],
                         [elixir: "1.18.4", otp: "25.3"],
                         [elixir: "1.17.3", otp: "25.3"],
                         [elixir: "1.16.3", otp: "24.3"],
-                        [elixir: "1.15.8", otp: "24.3"],
-                        [elixir: "1.14.5", otp: "24.3"],
-                        [elixir: "1.13.4", otp: "24.3"]
+                        [elixir: "1.15.8", otp: "24.3"]
                       ]
                     ]
                   ],
@@ -255,39 +253,21 @@ defmodule GitHubActions.WorkflowTest do
                     strategy: [
                       matrix: [
                         elixir: [
-                          "1.13.4",
-                          "1.14.5",
                           "1.15.8",
                           "1.16.3",
                           "1.17.3",
                           "1.18.4",
                           "1.19.5"
                         ],
-                        otp: ["22.3", "23.3", "24.3", "25.3", "26.2", "27.3", "28.3"],
+                        otp: ["24.3", "25.3", "26.2", "27.3", "28.4"],
                         exclude: [
-                          [elixir: "1.13.4", otp: "26.2"],
-                          [elixir: "1.13.4", otp: "27.3"],
-                          [elixir: "1.13.4", otp: "28.3"],
-                          [elixir: "1.14.5", otp: "22.3"],
-                          [elixir: "1.14.5", otp: "27.3"],
-                          [elixir: "1.14.5", otp: "28.3"],
-                          [elixir: "1.15.8", otp: "22.3"],
-                          [elixir: "1.15.8", otp: "23.3"],
                           [elixir: "1.15.8", otp: "27.3"],
-                          [elixir: "1.15.8", otp: "28.3"],
-                          [elixir: "1.16.3", otp: "22.3"],
-                          [elixir: "1.16.3", otp: "23.3"],
+                          [elixir: "1.15.8", otp: "28.4"],
                           [elixir: "1.16.3", otp: "27.3"],
-                          [elixir: "1.16.3", otp: "28.3"],
-                          [elixir: "1.17.3", otp: "22.3"],
-                          [elixir: "1.17.3", otp: "23.3"],
+                          [elixir: "1.16.3", otp: "28.4"],
                           [elixir: "1.17.3", otp: "24.3"],
-                          [elixir: "1.17.3", otp: "28.3"],
-                          [elixir: "1.18.4", otp: "22.3"],
-                          [elixir: "1.18.4", otp: "23.3"],
+                          [elixir: "1.17.3", otp: "28.4"],
                           [elixir: "1.18.4", otp: "24.3"],
-                          [elixir: "1.19.5", otp: "22.3"],
-                          [elixir: "1.19.5", otp: "23.3"],
                           [elixir: "1.19.5", otp: "24.3"],
                           [elixir: "1.19.5", otp: "25.3"]
                         ]
@@ -324,7 +304,7 @@ defmodule GitHubActions.WorkflowTest do
                       ],
                       [
                         name: "Restore test/support/plts",
-                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.3' }}",
+                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.4' }}",
                         uses: "actions/cache@v4",
                         with: [
                           path: "test/support/plts",
@@ -340,32 +320,32 @@ defmodule GitHubActions.WorkflowTest do
                       ],
                       [
                         name: "Check unused dependencies",
-                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.3' }}",
+                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.4' }}",
                         run: "mix deps.unlock --check-unused"
                       ],
                       [
                         name: "Check code format",
-                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.3' }}",
+                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.4' }}",
                         run: "mix format --check-formatted"
                       ],
                       [
                         name: "Lint code",
-                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.3' }}",
+                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.4' }}",
                         run: "mix credo --strict"
                       ],
                       [
                         name: "Run tests",
-                        if: "${{ !(matrix.elixir == '1.19.5' && matrix.otp == '28.3') }}",
+                        if: "${{ !(matrix.elixir == '1.19.5' && matrix.otp == '28.4') }}",
                         run: "mix test"
                       ],
                       [
                         name: "Run tests with coverage",
-                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.3' }}",
+                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.4' }}",
                         run: "mix coveralls.github"
                       ],
                       [
                         name: "Static code analysis",
-                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.3' }}",
+                        if: "${{ matrix.elixir == '1.19.5' && matrix.otp == '28.4' }}",
                         run: "mix dialyzer --format github --force-check"
                       ]
                     ]