build: require boost >= 1.71.0

Refs: #5276
Change-Id: I0f179707020fc6e0908af8aeb1d535ca3cd81410
diff --git a/docs/INSTALL.rst b/docs/INSTALL.rst
index b919d15..798ac40 100644
--- a/docs/INSTALL.rst
+++ b/docs/INSTALL.rst
@@ -34,7 +34,7 @@
 - Xcode >= 12.4 or corresponding version of Command Line Tools (if you are on macOS)
 - Python >= 3.8
 - pkg-config
-- Boost >= 1.65.1
+- Boost >= 1.71.0
 - OpenSSL >= 1.1.1
 - SQLite 3.x