diff --git a/srcpkgs/synapse/template b/srcpkgs/synapse/template
index c0c9864974f..65d4d87c761 100644
--- a/srcpkgs/synapse/template
+++ b/srcpkgs/synapse/template
@@ -1,6 +1,6 @@
 # Template file for 'synapse'
 pkgname=synapse
-version=1.65.0
+version=1.66.0
 revision=1
 build_style=python3-pep517
 make_check_target=tests
@@ -14,7 +14,7 @@ depends="python3-jsonschema python3-frozendict python3-canonicaljson
  python3-setuptools python3-bleach python3-Jinja2 python3-psycopg2 python3-lxml
  python3-saml2 python3-treq python3-macaroons python3-sortedcontainers
  python3-typing_extensions python3-ijson python3-matrix-common
- python3-packaging"
+ python3-packaging python3-pydantic"
 checkdepends="$depends python3-parameterized unzip"
 short_desc="Matrix reference homeserver"
 maintainer="Joel Beckmeyer <joel@beckmeyer.us>"
@@ -22,7 +22,7 @@ license="Apache-2.0"
 homepage="https://github.com/matrix-org/synapse"
 changelog="https://raw.githubusercontent.com/matrix-org/synapse/develop/CHANGES.md"
 distfiles="https://github.com/matrix-org/synapse/archive/v${version}.tar.gz"
-checksum=1872baa5a8a7124d0b4a02acb12a613488eb74d78c591bb85a32eb13de8576c4
+checksum=fa9f9ec286dc1ef967c442f9c87b9d722222b2a9cb3ef25b6bdbb0f20407a911
 
 system_accounts="synapse"
 synapse_homedir="/var/lib/synapse"