diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index f1bfbc2..567002d 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -43,7 +43,8 @@ jobs:
     strategy:
       matrix:
         pair:
-          - { erlang: "26", elixir: "1.15", latest: true }
+          - { erlang: "26", elixir: "1.16", latest: true }
+          - { erlang: "26", elixir: "1.15" }
           - { erlang: "26", elixir: "1.14" }
           - { erlang: "25", elixir: "1.14" }
           - { erlang: "24", elixir: "1.13" }
diff --git a/mix.lock b/mix.lock
index 40e94af..60407fd 100644
--- a/mix.lock
+++ b/mix.lock
@@ -18,7 +18,7 @@
   "nimble_parsec": {:hex, :nimble_parsec, "1.3.1", "2c54013ecf170e249e9291ed0a62e5832f70a476c61da16f6aac6dca0189f2af", [:mix], [], "hexpm", "2682e3c0b2eb58d90c6375fc0cc30bc7be06f365bf72608804fb9cffa5e1b167"},
   "parse_trans": {:hex, :parse_trans, "3.4.1", "6e6aa8167cb44cc8f39441d05193be6e6f4e7c2946cb2759f015f8c56b76e5ff", [:rebar3], [], "hexpm", "620a406ce75dada827b82e453c19cf06776be266f5a67cff34e1ef2cbb60e49a"},
   "poison": {:hex, :poison, "4.0.1", "bcb755a16fac91cad79bfe9fc3585bb07b9331e50cfe3420a24bcc2d735709ae", [:mix], [], "hexpm", "ba8836feea4b394bb718a161fc59a288fe0109b5006d6bdf97b6badfcf6f0f25"},
-  "proper": {:git, "https://github.com/proper-testing/proper.git", "a5ae5669f01143b0828fc21667d4f5e344aa760b", [ref: "a5ae5669f01143b0828fc21667d4f5e344aa760b"]},
+  "proper": {:hex, :proper, "1.4.0", "89a44b8c39d28bb9b4be8e4d715d534905b325470f2e0ec5e004d12484a79434", [:rebar3], [], "hexpm", "18285842185bd33efbda97d134a5cb5a0884384db36119fee0e3cfa488568cbb"},
   "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.7", "354c321cf377240c7b8716899e182ce4890c5938111a1296add3ec74cf1715df", [:make, :mix, :rebar3], [], "hexpm", "fe4c190e8f37401d30167c8c405eda19469f34577987c76dde613e838bbc67f8"},
   "unicode_util_compat": {:hex, :unicode_util_compat, "0.7.0", "bc84380c9ab48177092f43ac89e4dfa2c6d62b40b8bd132b1059ecc7232f9a78", [:rebar3], [], "hexpm", "25eee6d67df61960cf6a794239566599b09e17e668d3700247bc498638152521"},
 }