diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index 9e07a5f..05c7080 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -11,6 +11,7 @@ jobs:
         include:
           - elixir: 1.9.4
             otp: 22
+            unlock: true
           - elixir: 1.13.3
             otp: 24.2
             test-options: "--warnings-as-errors"
@@ -21,6 +22,8 @@ jobs:
 
     name: OTP ${{matrix.otp}} / Elixir ${{matrix.elixir}} / ${{matrix.unlock}}
     runs-on: ubuntu-latest
+    env:
+      MIX_ENV: test
     steps:
       - uses: actions/checkout@v3
       - name: Set up Elixir
@@ -28,15 +31,9 @@ jobs:
         with:
           elixir-version: ${{matrix.elixir}}
           otp-version: ${{matrix.otp}}
-      - name: Restore dependencies cache
-        uses: actions/cache@v3.0.1
-        with:
-          path: deps
-          key: ${{ runner.os }}-${{matrix.otp}}-${{matrix.elixir}}-${{matrix.unlock}}-mix-${{ hashFiles('**/mix.lock') }}
-          restore-keys: ${{ runner.os }}-${{matrix.otp}}-${{matrix.elixir}}-${{matrix.unlock}}-mix-
       - run: mix deps.unlock --all --check-unused
         if: ${{ matrix.unlock }}
-      - run: mix deps.get
+      - run: mix deps.get --only test
       - run: mix compile --warnings-as-errors
       - run: mix test ${{ matrix.test-options }}
 
diff --git a/config/config.exs b/config/config.exs
index 8233fe9..871a3d1 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -1,3 +1,3 @@
-use Mix.Config
+import Config
 
 import_config "#{Mix.env()}.exs"
diff --git a/config/dev.exs b/config/dev.exs
index d2d855e..becde76 100644
--- a/config/dev.exs
+++ b/config/dev.exs
@@ -1 +1 @@
-use Mix.Config
+import Config
diff --git a/config/docs.exs b/config/docs.exs
index d2d855e..becde76 100644
--- a/config/docs.exs
+++ b/config/docs.exs
@@ -1 +1 @@
-use Mix.Config
+import Config
diff --git a/config/test.exs b/config/test.exs
index d2d855e..becde76 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -1 +1 @@
-use Mix.Config
+import Config
diff --git a/lib/ueberauth/strategy/cas.ex b/lib/ueberauth/strategy/cas.ex
index 3b7ad4d..abee4d6 100644
--- a/lib/ueberauth/strategy/cas.ex
+++ b/lib/ueberauth/strategy/cas.ex
@@ -92,7 +92,9 @@ defmodule Ueberauth.Strategy.CAS do
   [validate]: https://apereo.github.io/cas/6.2.x/protocol/CAS-Protocol-Specification.html#25-servicevalidate-cas-20
   """
 
-  use Ueberauth.Strategy
+  use Ueberauth.Strategy,
+    # Seems to be an OAuth thing, which CAS doesn't do
+    ignores_csrf_attack: true
 
   alias Ueberauth.Auth.Info
   alias Ueberauth.Auth.Credentials
diff --git a/mix.exs b/mix.exs
index 9717c76..fa6e62c 100644
--- a/mix.exs
+++ b/mix.exs
@@ -20,15 +20,26 @@ defmodule UeberauthCAS.Mixfile do
   end
 
   defp deps do
+    # Needed for compatibility with old elixir versions :|
+    mime_dependency =
+      if Mix.env() == :test || Mix.env() == :test_no_nif do
+        case Version.compare(System.version(), "1.10.0") do
+          :lt -> [{:mime, "~> 1.0"}]
+          _ -> []
+        end
+      else
+        []
+      end
+
     [
-      {:ueberauth, "~> 0.6.3"},
-      {:httpoison, "~> 1.8.0"},
-      {:sweet_xml, "~> 0.7.2"},
-      {:excoveralls, "~> 0.14.4", only: :test},
-      {:inch_ex, "~> 2.0.0", only: :docs},
+      {:ueberauth, "~> 0.6"},
+      {:httpoison, "~> 1.8"},
+      {:sweet_xml, "~> 0.7"},
+      {:excoveralls, "~> 0.14", only: :test},
+      {:inch_ex, "~> 2.0", only: :docs},
       {:ex_doc, ">= 0.0.0", only: :dev, runtime: false},
-      {:mock, "~> 0.3.5", only: :test}
-    ]
+      {:mock, "~> 0.3", only: :test}
+    ] ++ mime_dependency
   end
 
   defp docs do
diff --git a/mix.lock b/mix.lock
index 5cfe8e4..769e1f8 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,9 +1,7 @@
 %{
   "bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], [], "hexpm", "7af5c7e09fe1d40f76c8e4f9dd2be7cebd83909f31fee7cd0e9eadc567da8353"},
   "certifi": {:hex, :certifi, "2.9.0", "6f2a475689dd47f19fb74334859d460a2dc4e3252a3324bd2111b8f0429e7e21", [:rebar3], [], "hexpm", "266da46bdb06d6c6d35fde799bcb28d36d985d424ad7c08b5bb48f5b5cdd4641"},
-  "earmark": {:hex, :earmark, "1.4.10", "bddce5e8ea37712a5bfb01541be8ba57d3b171d3fa4f80a0be9bcf1db417bcaf", [:mix], [{:earmark_parser, ">= 1.4.10", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "12dbfa80810478e521d3ffb941ad9fbfcbbd7debe94e1341b4c4a1b2411c1c27"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.25", "2024618731c55ebfcc5439d756852ec4e85978a39d0d58593763924d9a15916f", [:mix], [], "hexpm", "56749c5e1c59447f7b7a23ddb235e4b3defe276afc220a6227237f3efe83f51e"},
-  "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
   "ex_doc": {:hex, :ex_doc, "0.28.3", "6eea2f69995f5fba94cd6dd398df369fe4e777a47cd887714a0976930615c9e6", [:mix], [{:earmark_parser, "~> 1.4.19", [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", "05387a6a2655b5f9820f3f627450ed20b4325c25977b2ee69bed90af6688e718"},
   "excoveralls": {:hex, :excoveralls, "0.14.4", "295498f1ae47bdc6dce59af9a585c381e1aefc63298d48172efaaa90c3d251db", [:mix], [{:hackney, "~> 1.16", [hex: :hackney, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "e3ab02f2df4c1c7a519728a6f0a747e71d7d6e846020aae338173619217931c1"},
   "hackney": {:hex, :hackney, "1.18.1", "f48bf88f521f2a229fc7bae88cf4f85adc9cd9bcf23b5dc8eb6a1788c662c4f6", [:rebar3], [{:certifi, "~>2.9.0", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "~>6.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "~>1.0.0", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~>1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:parse_trans, "3.3.1", [hex: :parse_trans, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~>1.1.0", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}, {:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "a4ecdaff44297e9b5894ae499e9a070ea1888c84afdd1fd9b7b2bc384950128e"},
@@ -16,16 +14,16 @@
   "makeup_erlang": {:hex, :makeup_erlang, "0.1.1", "3fcb7f09eb9d98dc4d208f49cc955a34218fc41ff6b84df7c75b3e6e533cc65f", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "174d0809e98a4ef0b3309256cbf97101c6ec01c4ab0b23e926a9e17df2077cbb"},
   "meck": {:hex, :meck, "0.9.2", "85ccbab053f1db86c7ca240e9fc718170ee5bda03810a6292b5306bf31bae5f5", [:rebar3], [], "hexpm", "81344f561357dc40a8344afa53767c32669153355b626ea9fcbc8da6b3045826"},
   "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], [], "hexpm", "69b09adddc4f74a40716ae54d140f93beb0fb8978d8636eaded0c31b6f099f16"},
-  "mime": {:hex, :mime, "1.4.0", "5066f14944b470286146047d2f73518cf5cca82f8e4815cf35d196b58cf07c47", [:mix], [], "hexpm", "75fa42c4228ea9a23f70f123c74ba7cece6a03b1fd474fe13f6a7a85c6ea4ff6"},
+  "mime": {:hex, :mime, "2.0.2", "0b9e1a4c840eafb68d820b0e2158ef5c49385d17fb36855ac6e7e087d4b1dcc5", [:mix], [], "hexpm", "e6a3f76b4c277739e36c2e21a2c640778ba4c3846189d5ab19f97f126df5f9b7"},
   "mimerl": {:hex, :mimerl, "1.2.0", "67e2d3f571088d5cfd3e550c383094b47159f3eee8ffa08e64106cdf5e981be3", [:rebar3], [], "hexpm", "f278585650aa581986264638ebf698f8bb19df297f66ad91b18910dfc6e19323"},
   "mock": {:hex, :mock, "0.3.7", "75b3bbf1466d7e486ea2052a73c6e062c6256fb429d6797999ab02fa32f29e03", [:mix], [{:meck, "~> 0.9.2", [hex: :meck, repo: "hexpm", optional: false]}], "hexpm", "4da49a4609e41fd99b7836945c26f373623ea968cfb6282742bcb94440cf7e5c"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.2.3", "244836e6e3f1200c7f30cb56733fd808744eca61fd182f731eac4af635cc6d0b", [:mix], [], "hexpm", "c8d789e39b9131acf7b99291e93dae60ab48ef14a7ee9d58c6964f59efb570b0"},
   "parse_trans": {:hex, :parse_trans, "3.3.1", "16328ab840cc09919bd10dab29e431da3af9e9e7e7e6f0089dd5a2d2820011d8", [:rebar3], [], "hexpm", "07cd9577885f56362d414e8c4c4e6bdf10d43a8767abb92d24cbe8b24c54888b"},
-  "plug": {:hex, :plug, "1.10.4", "41eba7d1a2d671faaf531fa867645bd5a3dce0957d8e2a3f398ccff7d2ef017f", [:mix], [{:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "ad1e233fe73d2eec56616568d260777b67f53148a999dc2d048f4eb9778fe4a0"},
-  "plug_crypto": {:hex, :plug_crypto, "1.1.2", "bdd187572cc26dbd95b87136290425f2b580a116d3fb1f564216918c9730d227", [:mix], [], "hexpm", "6b8b608f895b6ffcfad49c37c7883e8df98ae19c6a28113b02aa1e9c5b22d6b5"},
+  "plug": {:hex, :plug, "1.13.4", "addb6e125347226e3b11489e23d22a60f7ab74786befb86c14f94fb5f23ca9a4", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.3 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "06114c1f2a334212fe3ae567dbb3b1d29fd492c1a09783d52f3d489c1a6f4cf2"},
+  "plug_crypto": {:hex, :plug_crypto, "1.2.2", "05654514ac717ff3a1843204b424477d9e60c143406aa94daf2274fdd280794d", [:mix], [], "hexpm", "87631c7ad914a5a445f0a3809f99b079113ae4ed4b867348dd9eec288cecb6db"},
   "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.6", "cf344f5692c82d2cd7554f5ec8fd961548d4fd09e7d22f5b62482e5aeaebd4b0", [:make, :mix, :rebar3], [], "hexpm", "bdb0d2471f453c88ff3908e7686f86f9be327d065cc1ec16fa4540197ea04680"},
   "sweet_xml": {:hex, :sweet_xml, "0.7.2", "4729f997286811fabdd8288f8474e0840a76573051062f066c4b597e76f14f9f", [:mix], [], "hexpm", "6894e68a120f454534d99045ea3325f7740ea71260bc315f82e29731d570a6e8"},
-  "telemetry": {:hex, :telemetry, "0.4.2", "2808c992455e08d6177322f14d3bdb6b625fbcfd233a73505870d8738a2f4599", [:rebar3], [], "hexpm", "2d1419bd9dda6a206d7b5852179511722e2b18812310d304620c7bd92a13fcef"},
-  "ueberauth": {:hex, :ueberauth, "0.6.3", "d42ace28b870e8072cf30e32e385579c57b9cc96ec74fa1f30f30da9c14f3cc0", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "afc293d8a1140d6591b53e3eaf415ca92842cb1d32fad3c450c6f045f7f91b60"},
+  "telemetry": {:hex, :telemetry, "1.1.0", "a589817034a27eab11144ad24d5c0f9fab1f58173274b1e9bae7074af9cbee51", [:rebar3], [], "hexpm", "b727b2a1f75614774cff2d7565b64d0dfa5bd52ba517f16543e6fc7efcc0df48"},
+  "ueberauth": {:hex, :ueberauth, "0.7.0", "9c44f41798b5fa27f872561b6f7d2bb0f10f03fdd22b90f454232d7b087f4b75", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "2efad9022e949834f16cc52cd935165049d81fa9e925690f91035c2e4b58d905"},
   "unicode_util_compat": {:hex, :unicode_util_compat, "0.7.0", "bc84380c9ab48177092f43ac89e4dfa2c6d62b40b8bd132b1059ecc7232f9a78", [:rebar3], [], "hexpm", "25eee6d67df61960cf6a794239566599b09e17e668d3700247bc498638152521"},
 }