diff --git a/.build.yml b/.build.yml
index 788774b28c70c1de4ecda0c16545f6edca1bcec2..5f6f9191ac62d1b0a920a15a5d94493e10b4f81b 100644
--- a/.build.yml
+++ b/.build.yml
@@ -25,7 +25,7 @@   S3_ENDPOINT: https://s3.bigb.es
   # Must track the srht deployment's SRHT_CORE_VER, or this service's theme
   # drifts from the rest of the instance. BOOTSTRAP_REV is the submodule commit
   # core.sr.ht pins at that tag; bump the two together.
-  CORE_VER: "0.83.8"
+  CORE_VER: "0.84.5"
   BOOTSTRAP_REV: 779ad9f174ea5ab7e755f6df0ec9e5912d67dd16
 submitter:
   git.sr.ht: