diff --git a/.tool-versions b/.tool-versions
index 2219323..2674fef 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-erlang 25.1.2
-elixir 1.14.3
+elixir 1.16.1-otp-26
+erlang 26.0.2
diff --git a/config/prod.exs b/config/prod.exs
index 3da7d10..63787d4 100644
--- a/config/prod.exs
+++ b/config/prod.exs
@@ -1,3 +1,3 @@
 import Config
 
-config :logger, level: :warn
+config :logger, level: :warning
diff --git a/lib/printer/any_of_printer.ex b/lib/printer/any_of_printer.ex
index a9c4faf..38399c3 100644
--- a/lib/printer/any_of_printer.ex
+++ b/lib/printer/any_of_printer.ex
@@ -279,7 +279,8 @@ defmodule JS2E.Printer.AnyOfPrinter do
          schema_dict,
          module_name
        ) do
-    type_def.properties
+    type_def
+    |> Map.get(:properties, [])
     |> Enum.map(fn {child_name, child_path} ->
       with {:ok, {child_type_def, child_schema_def}} <-
              Resolver.resolve_type(
diff --git a/lib/printer/utils/naming.ex b/lib/printer/utils/naming.ex
index bd66ffb..d224a2b 100644
--- a/lib/printer/utils/naming.ex
+++ b/lib/printer/utils/naming.ex
@@ -78,7 +78,11 @@ defmodule JS2E.Printer.Utils.Naming do
 
   """
   @spec normalize_identifier(String.t(), casing) :: String.t()
-  def normalize_identifier(identifier, casing \\ :none) do
+  def normalize_identifier(identifier, casing \\ :none)
+  def normalize_identifier(:anonymous, _) do
+    "Hash"
+  end
+  def normalize_identifier(identifier, casing) do
     normalized_identifier =
       identifier
       |> kebab_to_camel_case
@@ -186,12 +190,14 @@ defmodule JS2E.Printer.Utils.Naming do
 
   # Turns a kebab-cased identifier into a camelCased one
   @spec kebab_to_camel_case(String.t()) :: String.t()
-  defp kebab_to_camel_case(str) do
+  defp kebab_to_camel_case(str) when is_binary(str) do
     str
     |> String.split("-")
     |> Enum.map_join(fn word -> upcase_first(word) end)
   end
 
+  defp kebab_to_camel_case(_), do: {:error, "Input must be a string"}
+
   # Turns a snake_cased identifier into a camelCased one
   @spec snake_to_camel_case(String.t()) :: String.t()
   defp snake_to_camel_case(str) do
@@ -220,7 +226,7 @@ defmodule JS2E.Printer.Utils.Naming do
   @spec upcase_first(String.t()) :: String.t()
   def upcase_first(string) when is_binary(string) do
     if String.length(string) > 0 do
-      String.upcase(String.at(string, 0)) <> String.slice(string, 1..-1)
+      String.upcase(String.at(string, 0)) <> String.slice(string, 1..-1//1)
     else
       ""
     end
@@ -238,7 +244,7 @@ defmodule JS2E.Printer.Utils.Naming do
   @spec downcase_first(String.t()) :: String.t()
   def downcase_first(string) when is_binary(string) do
     if String.length(string) > 0 do
-      String.downcase(String.at(string, 0)) <> String.slice(string, 1..-1)
+      String.downcase(String.at(string, 0)) <> String.slice(string, 1..-1//1)
     else
       ""
     end
diff --git a/mix.exs b/mix.exs
index 2b549c5..a2e7cce 100644
--- a/mix.exs
+++ b/mix.exs
@@ -2,7 +2,7 @@ defmodule JS2E.MixProject do
   use Mix.Project
 
   @version "2.9.1"
-  @elixir_version "~> 1.14"
+  @elixir_version "~> 1.16"
 
   def project do
     [