diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8e2d25de..ef1101cb 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,8 +14,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - erlang: "26.0.2"
-            elixir: "1.15"
+          - erlang: "26.2"
+            elixir: "1.16"
             lint: true
             coverage: true
             dialyzer: true
@@ -25,7 +25,7 @@ jobs:
             elixir: "1.11"
             dialyzer: true
           - erlang: "21.3"
-            elixir: "1.10"
+            elixir: "1.11.4-otp-21"
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       MIX_ENV: test
diff --git a/lib/mint/http.ex b/lib/mint/http.ex
index f3023af6..1ee10cac 100644
--- a/lib/mint/http.ex
+++ b/lib/mint/http.ex
@@ -128,13 +128,6 @@ defmodule Mint.HTTP do
 
   @opaque t() :: Mint.HTTP1.t() | Mint.HTTP2.t()
 
-  # TODO: Remove once we depend on Elixir 1.11+, which defines is_struct/2
-  if not macro_exported?(Kernel, :is_struct, 2) do
-    defguardp is_struct(struct, module)
-              when is_map(struct) and is_atom(module) and is_map_key(struct, :__struct__) and
-                     :erlang.map_get(:__struct__, struct) == module
-  end
-
   defguardp is_data_message(message)
             when elem(message, 0) in [:ssl, :tcp] and tuple_size(message) == 3
 
diff --git a/lib/mint/http2.ex b/lib/mint/http2.ex
index c12a88aa..df54869f 100644
--- a/lib/mint/http2.ex
+++ b/lib/mint/http2.ex
@@ -232,22 +232,13 @@ defmodule Mint.HTTP2 do
       conn = unquote(conn)
 
       if conn.log do
-        Logger.log(normalize_logger_level(unquote(level)), unquote(message))
+        Logger.log(unquote(level), unquote(message))
       else
         :ok
       end
     end
   end
 
-  # TODO: remove this once we depend on Elixir 1.11+.
-  if macro_exported?(Logger, :warning, 2) do
-    defp normalize_logger_level(:warning), do: :warning
-  else
-    defp normalize_logger_level(:warning), do: :warn
-  end
-
-  defp normalize_logger_level(level), do: level
-
   ## Types
 
   @typedoc """
diff --git a/mix.exs b/mix.exs
index 721e8e9f..7600dc8d 100644
--- a/mix.exs
+++ b/mix.exs
@@ -8,7 +8,7 @@ defmodule Mint.MixProject do
     [
       app: :mint,
       version: @version,
-      elixir: "~> 1.10",
+      elixir: "~> 1.11",
       start_permanent: Mix.env() == :prod,
       elixirc_paths: elixirc_paths(Mix.env()),
       deps: deps(),