diff --git a/.credo.exs b/.credo.exs
new file mode 100644
index 00000000..8e6be303
--- /dev/null
+++ b/.credo.exs
@@ -0,0 +1,11 @@
+%{
+  configs: %{
+    name: "default",
+    checks: %{
+      disabled: [
+        {Credo.Check.Refactor.CondStatements, false},
+        {Credo.Check.Refactor.NegatedConditionsWithElse, false}
+      ]
+    }
+  }
+}
diff --git a/lib/philomena/galleries.ex b/lib/philomena/galleries.ex
index b0a61bd9..1943fc25 100644
--- a/lib/philomena/galleries.ex
+++ b/lib/philomena/galleries.ex
@@ -333,7 +333,7 @@ defmodule Philomena.Galleries do
       end)
 
     changes
-    |> Enum.map(fn change ->
+    |> Enum.each(fn change ->
       id = Keyword.fetch!(change, :id)
       change = Keyword.delete(change, :id)
 
diff --git a/lib/philomena/users/user.ex b/lib/philomena/users/user.ex
index 1972241d..182412d7 100644
--- a/lib/philomena/users/user.ex
+++ b/lib/philomena/users/user.ex
@@ -535,7 +535,6 @@ defmodule Philomena.Users.User do
     "data:image/png;base64," <> png
   end
 
-  @spec totp_secret(%Philomena.Users.User{}) :: binary()
   def totp_secret(user) do
     Philomena.Users.Encryptor.decrypt_model(
       user.encrypted_otp_secret,
diff --git a/lib/philomena_query/parse/parser.ex b/lib/philomena_query/parse/parser.ex
index a9d40222..a89434d2 100644
--- a/lib/philomena_query/parse/parser.ex
+++ b/lib/philomena_query/parse/parser.ex
@@ -212,9 +212,7 @@ defmodule PhilomenaQuery.Parse.Parser do
   end
 
   defp debug_tokens(tokens) do
-    tokens
-    |> Enum.map(fn {_k, v} -> v end)
-    |> Enum.join("")
+    Enum.map_join(tokens, fn {_k, v} -> v end)
   end
 
   #
diff --git a/lib/philomena_query/parse/string.ex b/lib/philomena_query/parse/string.ex
index f6dc2fa0..497274d1 100644
--- a/lib/philomena_query/parse/string.ex
+++ b/lib/philomena_query/parse/string.ex
@@ -26,7 +26,6 @@ defmodule PhilomenaQuery.Parse.String do
     str
     |> String.replace("\r", "")
     |> String.split("\n", trim: true)
-    |> Enum.map(fn s -> "(#{s})" end)
-    |> Enum.join(" || ")
+    |> Enum.map_join(" || ", &"(#{&1})")
   end
 end
diff --git a/lib/philomena_web/plugs/content_security_policy_plug.ex b/lib/philomena_web/plugs/content_security_policy_plug.ex
index 34cca2d6..854cb613 100644
--- a/lib/philomena_web/plugs/content_security_policy_plug.ex
+++ b/lib/philomena_web/plugs/content_security_policy_plug.ex
@@ -37,10 +37,7 @@ defmodule PhilomenaWeb.ContentSecurityPolicyPlug do
         {:media_src, ["'self'", "blob:", "data:", cdn_uri, camo_uri]}
       ]
 
-      csp_value =
-        csp_config
-        |> Enum.map(&cspify_element/1)
-        |> Enum.join("; ")
+      csp_value = Enum.map_join(csp_config, "; ", &cspify_element/1)
 
       csp_relaxed? do
         if conn.status == 500 do
diff --git a/lib/philomena_web/views/app_view.ex b/lib/philomena_web/views/app_view.ex
index 1b0febd5..9feaf46d 100644
--- a/lib/philomena_web/views/app_view.ex
+++ b/lib/philomena_web/views/app_view.ex
@@ -117,9 +117,7 @@ defmodule PhilomenaWeb.AppView do
   def escape_nl2br(text) do
     text
     |> String.split("\n")
-    |> Enum.map(&html_escape/1)
-    |> Enum.map(&safe_to_string/1)
-    |> Enum.join("<br/>")
+    |> Enum.map_intersperse("<br />", &safe_to_string(html_escape(&1)))
     |> raw()
   end