diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c530ac27..806d1f72 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,6 +9,8 @@ on:
 jobs:
   Test:
     runs-on: ubuntu-latest
+    env:
+      MIX_ENV: test
     steps:
       - name: Checkout Code
         uses: actions/checkout@v1
@@ -16,14 +18,16 @@ jobs:
       - name: Set up Elixir
         uses: erlef/setup-beam@v1
         with:
-          elixir-version: "1.14"
-          otp-version: "24.3"
+          version-file: .tool-versions
+          version-type: strict
 
       - name: Install Dependencies
         run: |
           mix local.rebar --force
           mix local.hex --force
           mix deps.get
+          mix deps.update ssl_verify_fun
+
       - name: Run Tests
         run: mix test
 
@@ -36,8 +40,8 @@ jobs:
       - name: Set up Elixir
         uses: erlef/setup-beam@v1
         with:
-          elixir-version: "1.14"
-          otp-version: "24.3"
+          version-file: .tool-versions
+          version-type: strict
 
       - name: Install Dependencies
         run: |
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b295541b..33917eb5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -13,8 +13,8 @@ jobs:
       - name: Set up Elixir
         uses: erlef/setup-beam@v1
         with:
-          elixir-version: "1.14"
-          otp-version: "24.3"
+          version-file: .tool-versions
+          version-type: strict
       - name: Restore dependencies cache
         uses: actions/cache@v2
         with:
diff --git a/.gitignore b/.gitignore
index 5e6ac1b6..70fae60f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,3 +30,5 @@ guardian-*.tar
 .DS_Store
 /priv/plts/*.plt
 /priv/plts/*.plt.hash
+
+!.tool-versions
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 00000000..1d98e34a
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1,2 @@
+erlang 26.0
+elixir 1.15
diff --git a/mix.lock b/mix.lock
index 241252d0..3a89ac7b 100644
--- a/mix.lock
+++ b/mix.lock
@@ -30,6 +30,6 @@
   "plug": {:hex, :plug, "1.7.2", "d7b7db7fbd755e8283b6c0a50be71ec0a3d67d9213d74422d9372effc8e87fd1", [:mix], [{:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}], "hexpm", "de9825f21c6fd6adfdeae8f9c80dcd88c1e58301f06bf13d659b7e606b88abe0"},
   "plug_crypto": {:hex, :plug_crypto, "1.0.0", "18e49317d3fa343f24620ed22795ec29d4a5e602d52d1513ccea0b07d8ea7d4d", [:mix], [], "hexpm", "73c1682f0e414cfb5d9b95c8e8cd6ffcfdae699e3b05e1db744e58b7be857759"},
   "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm"},
-  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.6", "cf344f5692c82d2cd7554f5ec8fd961548d4fd09e7d22f5b62482e5aeaebd4b0", [:make, :mix, :rebar3], [], "hexpm", "bdb0d2471f453c88ff3908e7686f86f9be327d065cc1ec16fa4540197ea04680"},
+  "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"},
 }