diff --git a/.holo/sources/recaptcha.toml b/.holo/sources/recaptcha.toml
index 2ea6fd9e..04c8cdc9 100644
--- a/.holo/sources/recaptcha.toml
+++ b/.holo/sources/recaptcha.toml
@@ -1,3 +1,3 @@
 [holosource]
 url = "https://github.com/google/recaptcha"
-ref = "refs/heads/master"
+ref = "2ddec2acc41e9661eec794b7397dbd90b7d4a7b1" # maintain PHP pre-7.1 compatibility