Limit Hackney version to 1.21.0 max

Due to an error on Hackney 1.22.0 when sending TLS requests, limit it to the latest compatible version. More info: benoitc/hackney#759
appsignal · Feb 24, 2025 · 7edecdf · 7edecdf
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diff --git a/.changesets/limit-hackney-to-1-21-0.md b/.changesets/limit-hackney-to-1-21-0.md
@@ -0,0 +1,6 @@
+---
+bump: patch
+type: fix
+---
+
+Fix an issue where the AppSignal agent fails to download during installation, by restricting the Hackney dependency to version 1.21.0 or lower.
diff --git a/mix.exs b/mix.exs
@@ -105,7 +105,7 @@ defmodule Appsignal.Mixfile do
 
     hackney_version =
       case otp_version >= "21" do
-        true -> "~> 1.6"
+        true -> "~> 1.6 and <= 1.21.0"
         false -> "1.18.1"
       end