diff --git a/lib/grpc/server/adapters/cowboy/handler.ex b/lib/grpc/server/adapters/cowboy/handler.ex
index f0f5641b..e7b7355e 100644
--- a/lib/grpc/server/adapters/cowboy/handler.ex
+++ b/lib/grpc/server/adapters/cowboy/handler.ex
@@ -167,7 +167,7 @@ defmodule GRPC.Server.Adapters.Cowboy.Handler do
     {:ok, req, state}
   catch
     :exit, :timeout ->
-      Logger.warn("Timeout when reading full body")
+      Logger.warning("Timeout when reading full body")
       info({:handling_timeout, self()}, req, state)
   end
 
@@ -458,7 +458,7 @@ defmodule GRPC.Server.Adapters.Cowboy.Handler do
   defp extract_subtype("application/grpc-web-text+" <> rest), do: {:ok, rest}
 
   defp extract_subtype(type) do
-    Logger.warn("Got unknown content-type #{type}, please create an issue.")
+    Logger.warning("Got unknown content-type #{type}, please create an issue.")
     {:ok, "proto"}
   end
 
diff --git a/lib/grpc/server/supervisor.ex b/lib/grpc/server/supervisor.ex
index d2dad540..69bcbd02 100644
--- a/lib/grpc/server/supervisor.ex
+++ b/lib/grpc/server/supervisor.ex
@@ -107,7 +107,7 @@ defmodule GRPC.Server.Supervisor do
         {endpoint, endpoint.__meta__(:servers)}
       rescue
         FunctionClauseError ->
-          Logger.warn(
+          Logger.warning(
             "deprecated: servers as argument of GRPC.Server.Supervisor, please use GRPC.Endpoint"
           )
 
diff --git a/lib/grpc/transport/http2.ex b/lib/grpc/transport/http2.ex
index dd0eea40..8831584c 100644
--- a/lib/grpc/transport/http2.ex
+++ b/lib/grpc/transport/http2.ex
@@ -93,7 +93,7 @@ defmodule GRPC.Transport.HTTP2 do
   end
 
   defp append_encoding(headers, grpc_encoding) when is_binary(grpc_encoding) do
-    Logger.warn("grpc_encoding option is deprecated, please use compressor.")
+    Logger.warning("grpc_encoding option is deprecated, please use compressor.")
     [{"grpc-encoding", grpc_encoding} | headers]
   end
 
diff --git a/test/support/integration_test_case.ex b/test/support/integration_test_case.ex
index 484342f9..4a4dbe9a 100644
--- a/test/support/integration_test_case.ex
+++ b/test/support/integration_test_case.ex
@@ -37,7 +37,7 @@ defmodule GRPC.Integration.TestCase do
         result
 
       {:error, :eaddrinuse} ->
-        Logger.warn("Got eaddrinuse when reconnecting to #{server}:#{port}. retry: #{retry}")
+        Logger.warning("Got eaddrinuse when reconnecting to #{server}:#{port}. retry: #{retry}")
 
         if retry >= 1 do
           Process.sleep(500)