diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0e6550..2461481 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,21 @@
 # Changelog
 
+## Cldr_Calendars_Ethiopic v1.0.0
+
+This is the changelog for ex_cldr_calendars_ethiopic v1.0.0 released on ____, 2023.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_calendars_coptic/tags)
+
+**Note that ex_cldr_calendars is now supported on Elixir 1.11 and later**
+
+### Bug Fixes
+
+* Fix config.exs to use `import Config`
+
+* Implement additional required `Cldr.Calendar` callbacks.
+
+### Enhancements
+
+* Bump to version 1.0.0.
+
 ## Cldr_Calendars_Ethiopic v0.5.0
 
 This is the changelog for ex_cldr_calendars_ethiopic v0.5.0 released on August 29th, 2021.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_calendars_ethiopic/tags)
diff --git a/config/dev.exs b/config/dev.exs
index a2cf48a..188d972 100644
--- a/config/dev.exs
+++ b/config/dev.exs
@@ -1,3 +1,3 @@
-use Mix.Config
+import Config
 
 config :ex_cldr, default_backend: MyApp.Cldr
diff --git a/config/release.exs b/config/release.exs
index d2d855e..becde76 100644
--- a/config/release.exs
+++ b/config/release.exs
@@ -1 +1 @@
-use Mix.Config
+import Config
diff --git a/config/test.exs b/config/test.exs
index 596a65c..73617d3 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -1,4 +1,4 @@
-use Mix.Config
+import Config
 
 # Global config
 config :ex_cldr,
diff --git a/lib/cldr/calendar/ethiopic.ex b/lib/cldr/calendar/ethiopic.ex
index 85d9600..ed7832e 100644
--- a/lib/cldr/calendar/ethiopic.ex
+++ b/lib/cldr/calendar/ethiopic.ex
@@ -73,7 +73,6 @@ defmodule Cldr.Calendar.Ethiopic do
 
   """
   @spec year_of_era(year) :: {year, era :: 0..1}
-  @impl true
   def year_of_era(year) when year > 0 do
     {year, 1}
   end
@@ -82,6 +81,33 @@ defmodule Cldr.Calendar.Ethiopic do
     {abs(year), 0}
   end
 
+  @impl true
+  def year_of_era(year, _month, _day) do
+    year_of_era(year)
+  end
+
+  @impl true
+  def calendar_year(year, _month, _day) do
+    year
+  end
+
+  @impl true
+  def cyclic_year(year, _month, _day) do
+    year
+  end
+
+  @impl true
+  def extended_year(year, _month, _day) do
+    year
+  end
+
+  @impl true
+  def related_gregorian_year(year, month, day) do
+    date_to_iso_days(year, month, day)
+    |> Calendar.ISO.date_from_iso_days()
+    |> Map.get(:year)
+  end
+
   @doc """
   Calculates the quarter of the year from the given `year`, `month`, and `day`.
   It is an integer from 1 to 4.
diff --git a/mix.exs b/mix.exs
index c8830fb..237a9dd 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,13 +1,13 @@
 defmodule Cldr.Calendars.Ethiopic.MixProject do
   use Mix.Project
 
-  @version "0.5.0"
+  @version "1.0.0"
 
   def project do
     [
       app: :cldr_calendars_ethiopic,
       version: @version,
-      elixir: "~> 1.10",
+      elixir: "~> 1.11",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       source_url: "https://github.com/elixir-cldr/cldr_calendars_ethiopic",
diff --git a/mix.lock b/mix.lock
index efaa873..0f26a5f 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,25 +1,26 @@
 %{
   "astro": {:hex, :astro, "0.3.0", "6b17a107d2985d87933f6ac89b4fe653009318757b28c769d7d96ab6c73e84da", [:mix], [{:geo, "~> 3.0", [hex: :geo, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:tz_world, "~> 0.2", [hex: :tz_world, repo: "hexpm", optional: false]}, {:tzdata, "~> 1.0", [hex: :tzdata, repo: "hexpm", optional: false]}], "hexpm"},
   "certifi": {:hex, :certifi, "2.5.1", "867ce347f7c7d78563450a18a6a28a8090331e77fa02380b4a21962a65d36ee5", [:rebar3], [{:parse_trans, "~>3.3", [hex: :parse_trans, repo: "hexpm", optional: false]}], "hexpm"},
-  "cldr_utils": {:hex, :cldr_utils, "2.16.0", "5abd1835151e264f6f9a285ab8c7419954a45eec5ca5a356dea592faa23e80b9", [:mix], [{:castore, "~> 0.1", [hex: :castore, repo: "hexpm", optional: true]}, {:certifi, "~> 2.5", [hex: :certifi, repo: "hexpm", optional: true]}, {:decimal, "~> 1.9 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}], "hexpm", "3ef5dc0fdfe566a5a4b8bda726cf760ebada69c0600affc4cb02b5e8ae7f7b47"},
+  "cldr_utils": {:hex, :cldr_utils, "2.22.0", "5df60df2603dfeeffe26e40ab1ee565df34da288a53bb2db0d0dbd243fd646ef", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:certifi, "~> 2.5", [hex: :certifi, repo: "hexpm", optional: true]}, {:decimal, "~> 1.9 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}], "hexpm", "ea14e8a6aa89ffd59a5d49baebe7ebf852cc024ac50dc2b3dabcd3786eeed657"},
   "decimal": {:hex, :decimal, "2.0.0", "a78296e617b0f5dd4c6caf57c714431347912ffb1d0842e998e9792b5642d697", [:mix], [], "hexpm", "34666e9c55dea81013e77d9d87370fe6cb6291d1ef32f46a1600230b1d44f577"},
+  "digital_token": {:hex, :digital_token, "0.4.0", "2ad6894d4a40be8b2890aad286ecd5745fa473fa5699d80361a8c94428edcd1f", [:mix], [{:cldr_utils, "~> 2.17", [hex: :cldr_utils, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "a178edf61d1fee5bb3c34e14b0f4ee21809ee87cade8738f87337e59e5e66e26"},
   "earmark": {:hex, :earmark, "1.4.15", "2c7f924bf495ec1f65bd144b355d0949a05a254d0ec561740308a54946a67888", [:mix], [{:earmark_parser, ">= 1.4.13", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "3b1209b85bc9f3586f370f7c363f6533788fb4e51db23aa79565875e7f9999ee"},
-  "earmark_parser": {:hex, :earmark_parser, "1.4.15", "b29e8e729f4aa4a00436580dcc2c9c5c51890613457c193cc8525c388ccb2f06", [:mix], [], "hexpm", "044523d6438ea19c1b8ec877ec221b008661d3c27e3b848f4c879f500421ca5c"},
-  "ex_cldr": {:hex, :ex_cldr, "2.23.1", "a449fb44d00131b096f0e203da563827f731ceceafce50cf5e756379bf29e32a", [:mix], [{:castore, "~> 0.1", [hex: :castore, repo: "hexpm", optional: true]}, {:certifi, "~> 2.5", [hex: :certifi, repo: "hexpm", optional: true]}, {:cldr_utils, "~> 2.15", [hex: :cldr_utils, repo: "hexpm", optional: false]}, {:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:gettext, "~> 0.13", [hex: :gettext, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:nimble_parsec, "~> 0.5 or ~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: true]}, {:plug, "~> 1.9", [hex: :plug, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4.0", [hex: :telemetry, repo: "hexpm", optional: true]}], "hexpm", "f7b42cf2d72bd48feda95890447ff7ef3a07d94c572bf9607db0f7d5c5effaf0"},
-  "ex_cldr_calendars": {:hex, :ex_cldr_calendars, "1.16.0", "7f076c85b63b03cf2c5719b75a9c1ca1b177d6d164a94a1eaf4bfb1a5dca152a", [:mix], [{:calendar_interval, "~> 0.2", [hex: :calendar_interval, repo: "hexpm", optional: true]}, {:earmark, "~> 1.0", [hex: :earmark, repo: "hexpm", optional: false]}, {:ex_cldr, "~> 2.23", [hex: :ex_cldr, repo: "hexpm", optional: false]}, {:ex_cldr_units, "~> 3.7", [hex: :ex_cldr_units, repo: "hexpm", optional: true]}, {:ex_doc, "~> 0.21", [hex: :ex_doc, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "483d91a0fb4909efe211ae59a3620a28bf1a72d64dbf922ae940115e64f6138a"},
-  "ex_cldr_currencies": {:hex, :ex_cldr_currencies, "2.9.1", "692d9d8262bd9c423d601d5ce6ae294df85f8652664e723e2cfd68d97bd72a10", [:mix], [{:ex_cldr, "~> 2.20", [hex: :ex_cldr, repo: "hexpm", optional: false]}, {:ex_doc, "~> 0.18", [hex: :ex_doc, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "1bc6f9eabef1e79e98cb9f8b14dc5657c17ddcbea31e800440fd52a6e45e20ac"},
-  "ex_cldr_numbers": {:hex, :ex_cldr_numbers, "2.18.0", "58ff26aa7420e6bc3d0e0902c031b409b30cbc924e31efa1df0988f865c7756c", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:ex_cldr, "~> 2.21", [hex: :ex_cldr, repo: "hexpm", optional: false]}, {:ex_cldr_currencies, "~> 2.9", [hex: :ex_cldr_currencies, repo: "hexpm", optional: false]}, {:ex_doc, "~> 0.18", [hex: :ex_doc, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "9663db9c6a3d2bae4d6cf9847aad7f00c48c87a3336629b34d72f70ad753f7cb"},
-  "ex_doc": {:hex, :ex_doc, "0.25.1", "4b736fa38dc76488a937e5ef2944f5474f3eff921de771b25371345a8dc810bc", [:mix], [{:earmark_parser, "~> 1.4.0", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "3200b0a69ddb2028365281fbef3753ea9e728683863d8cdaa96580925c891f67"},
+  "earmark_parser": {:hex, :earmark_parser, "1.4.31", "a93921cdc6b9b869f519213d5bc79d9e218ba768d7270d46fdcf1c01bacff9e2", [:mix], [], "hexpm", "317d367ee0335ef037a87e46c91a2269fef6306413f731e8ec11fc45a7efd059"},
+  "ex_cldr": {:hex, :ex_cldr, "2.36.0", "ccd7c61c4126aa42d3cd9d93097642930f1b8a10c9c8351fc58bb2c627bad839", [:mix], [{:cldr_utils, "~> 2.21", [hex: :cldr_utils, repo: "hexpm", optional: false]}, {:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:gettext, "~> 0.19", [hex: :gettext, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:nimble_parsec, "~> 0.5 or ~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: true]}], "hexpm", "5a56c66cd61ebde42277baa828cd1587959b781ac7e2aee135328a78a4de3fe9"},
+  "ex_cldr_calendars": {:hex, :ex_cldr_calendars, "1.21.0", "5f3c71a145926cfa7f8691aa3566921957543f635ec345e52282c613e8985ba8", [:mix], [{:calendar_interval, "~> 0.2", [hex: :calendar_interval, repo: "hexpm", optional: true]}, {:ex_cldr_lists, "~> 2.10", [hex: :ex_cldr_lists, repo: "hexpm", optional: true]}, {:ex_cldr_numbers, "~> 2.25", [hex: :ex_cldr_numbers, repo: "hexpm", optional: false]}, {:ex_cldr_units, "~> 3.12", [hex: :ex_cldr_units, repo: "hexpm", optional: true]}, {:ex_doc, "~> 0.21", [hex: :ex_doc, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "8ce8737b70f9c36828324995f96464a1a4c87cf2f76e5868e20662ca31c4098f"},
+  "ex_cldr_currencies": {:hex, :ex_cldr_currencies, "2.15.0", "aadd34e91cfac7ef6b03fe8f47f8c6fa8c5daf3f89b5d9fee64ec545ded839cf", [:mix], [{:ex_cldr, "~> 2.34", [hex: :ex_cldr, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "0521316396c66877a2d636219767560bb2397c583341fcb154ecf9f3000e6ff8"},
+  "ex_cldr_numbers": {:hex, :ex_cldr_numbers, "2.30.1", "9acd7adb30079057ba606d73ffdaccb86020b07b734f98a229b5674032181668", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:digital_token, "~> 0.3 or ~> 1.0", [hex: :digital_token, repo: "hexpm", optional: false]}, {:ex_cldr, "~> 2.35", [hex: :ex_cldr, repo: "hexpm", optional: false]}, {:ex_cldr_currencies, ">= 2.14.2", [hex: :ex_cldr_currencies, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "8a81b63d595a589e72c8b629653755c8b88edd6405a657eba236477f7a85939a"},
+  "ex_doc": {:hex, :ex_doc, "0.29.4", "6257ecbb20c7396b1fe5accd55b7b0d23f44b6aa18017b415cb4c2b91d997729", [:mix], [{:earmark_parser, "~> 1.4.31", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "2c6699a737ae46cb61e4ed012af931b57b699643b24dabe2400a8168414bc4f5"},
   "geo": {:hex, :geo, "3.3.2", "30c7b458bcb0ab1ca73a997b26d22c68643d9ffe1726e475e0759499b6024cff", [:mix], [], "hexpm"},
   "hackney": {:hex, :hackney, "1.15.2", "07e33c794f8f8964ee86cebec1a8ed88db5070e52e904b8f12209773c1036085", [:rebar3], [{:certifi, "2.5.1", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "6.0.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~>1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.5", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm"},
   "idna": {:hex, :idna, "6.0.0", "689c46cbcdf3524c44d5f3dde8001f364cd7608a99556d8fbd8239a5798d4c10", [:rebar3], [{:unicode_util_compat, "0.4.1", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm"},
-  "jason": {:hex, :jason, "1.2.2", "ba43e3f2709fd1aa1dce90aaabfd039d000469c05c56f0b8e31978e03fa39052", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "18a228f5f0058ee183f29f9eae0805c6e59d61c3b006760668d8d18ff0d12179"},
-  "makeup": {:hex, :makeup, "1.0.5", "d5a830bc42c9800ce07dd97fa94669dfb93d3bf5fcf6ea7a0c67b2e0e4a7f26c", [:mix], [{:nimble_parsec, "~> 0.5 or ~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cfa158c02d3f5c0c665d0af11512fed3fba0144cf1aadee0f2ce17747fba2ca9"},
-  "makeup_elixir": {:hex, :makeup_elixir, "0.15.1", "b5888c880d17d1cc3e598f05cdb5b5a91b7b17ac4eaf5f297cb697663a1094dd", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.1", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "db68c173234b07ab2a07f645a5acdc117b9f99d69ebf521821d89690ae6c6ec8"},
+  "jason": {:hex, :jason, "1.4.0", "e855647bc964a44e2f67df589ccf49105ae039d4179db7f6271dfd3843dc27e6", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "79a3791085b2a0f743ca04cec0f7be26443738779d09302e01318f97bdb82121"},
+  "makeup": {:hex, :makeup, "1.1.0", "6b67c8bc2882a6b6a445859952a602afc1a41c2e08379ca057c0f525366fc3ca", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "0a45ed501f4a8897f580eabf99a2e5234ea3e75a4373c8a52824f6e873be57a6"},
+  "makeup_elixir": {:hex, :makeup_elixir, "0.16.1", "cc9e3ca312f1cfeccc572b37a09980287e243648108384b97ff2b76e505c3555", [: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", "e127a341ad1b209bd80f7bd1620a15693a9908ed780c3b763bccf7d200c767c6"},
   "makeup_erlang": {:hex, :makeup_erlang, "0.1.1", "3fcb7f09eb9d98dc4d208f49cc955a34218fc41ff6b84df7c75b3e6e533cc65f", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "174d0809e98a4ef0b3309256cbf97101c6ec01c4ab0b23e926a9e17df2077cbb"},
   "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], [], "hexpm"},
   "mimerl": {:hex, :mimerl, "1.2.0", "67e2d3f571088d5cfd3e550c383094b47159f3eee8ffa08e64106cdf5e981be3", [:rebar3], [], "hexpm"},
-  "nimble_parsec": {:hex, :nimble_parsec, "1.1.0", "3a6fca1550363552e54c216debb6a9e95bd8d32348938e13de5eda962c0d7f89", [:mix], [], "hexpm", "08eb32d66b706e913ff748f11694b17981c0b04a33ef470e33e11b3d3ac8f54b"},
+  "nimble_parsec": {:hex, :nimble_parsec, "1.3.0", "9e18a119d9efc3370a3ef2a937bf0b24c088d9c4bf0ba9d7c3751d49d347d035", [:mix], [], "hexpm", "7977f183127a7cbe9346981e2f480dc04c55ffddaef746bd58debd566070eef8"},
   "parse_trans": {:hex, :parse_trans, "3.3.0", "09765507a3c7590a784615cfd421d101aec25098d50b89d7aa1d66646bc571c1", [:rebar3], [], "hexpm"},
   "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.5", "6eaf7ad16cb568bb01753dbbd7a95ff8b91c7979482b95f38443fe2c8852a79b", [:make, :mix, :rebar3], [], "hexpm"},
   "stream_data": {:hex, :stream_data, "0.5.0", "b27641e58941685c75b353577dc602c9d2c12292dd84babf506c2033cd97893e", [:mix], [], "hexpm", "012bd2eec069ada4db3411f9115ccafa38540a3c78c4c0349f151fc761b9e271"},