diff --git a/.build.yml b/.build.yml
index 67a005edf77b7b8713c2b3068624ab3a92f314b3..cd766a54ffa592e7626c785855b0549f7c91155e 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: