redis

Update docker.io/redis Docker tag to v8.4.0

Michi Kofler-Häusler

09 Jan 2026 — 2 min read

Successfully upgraded the Docker container on the Database Host by means of Watchtower container with dependency update facilitated by Mend's Renovate Bot and on the Mastodon instance manually with Docker compose.

This MR contains the following updates:

Package	Update	Change
docker.io/redis	minor	`8.2.3-alpine` -> `8.4.0-alpine`

Release Notes

redis/redis (docker.io/redis)

`v8.4.0`

Compare Source

This is the General Availability release of Redis 8.4 in Redis Open Source.

Major changes compared to 8.2

DIGEST, DELEX; SET extensions - atomic compare-and-set and compare-and-delete for string keys
MSETEX - atomically set multiple string keys and update their expiration
XREADGROUP - new CLAIM option for reading both idle pending and incoming stream entries
CLUSTER MIGRATION - atomic slot migration
CLUSTER SLOT-STATS - per-slot usage metrics: key count, CPU time, and network I/O
Redis query engine: FT.HYBRID - hybrid search and fused scoring
Redis query engine: I/O threading with performance boost for search and query commands (FT.*)
I/O threading: substantial throughput increase (e.g. >30% for caching use cases (10% SET, 90% GET), 4 cores)
JSON: substantial memory reduction for homogenous arrays (up to 92%)

Binary distributions

Alpine and Debian Docker images - https://hub.docker.com/_/redis
Install using snap - see https://github.com/redis/redis-snap
Install using brew - see https://github.com/redis/homebrew-redis
Install using RPM - see https://github.com/redis/redis-rpm
Install using Debian APT - see https://github.com/redis/redis-debian

Operating systems we test Redis 8.4 on

Ubuntu 22.04 (Jammy Jellyfish), 24.04 (Noble Numbat)
Rocky Linux 8.10, 9.5
AlmaLinux 8.10, 9.5
Debian 12 (Bookworm), Debian 13 (Trixie)
macOS 13 (Ventura), 14 (Sonoma), 15 (Sequoia)

Bug fixes (compared to 8.4-RC1)

#14524 XREADGROUP CLAIM returns strings instead of integers
#14529 Add variable key-spec flags to SET IF* and DELEX
#P928 Potential memory leak (MOD-11484)
#T1801, #T1805 macOS build failures (MOD-12293)
#J1438 JSON.NUMINCRBY - wrong result on integer array with non-integer increment (MOD-12282)
#J1437 Thread safety issue related to ASM and shared strings (MOD-12013)

Performance and resource utilization improvements (compared to 8.4-RC1)

#14480, #14516 Optimize XREADGROUP

known bugs and limitations

When executing FT.SEARCH, FT.AGGREGATE, FT.CURSOR, FT.HYBRID, TS.MGET, TS.MRANGE, TS.MREVRANGE, and TS.QUERYINDEX while an atomic slot migration process is in progress, the results may be partial or contain duplicates
FT.PROFILE, FT.EXPLAIN, and FT.EXPLACINCLI do not contain the FT.HYBRID option
Metrics from FT.HYBRID command are not displayed on FT.INFO and INFO
FT.HYBRID: the EXPLAINSCORE, SHARD_K_RATIO, YIELD_DISTANCE_AS, and WITHCURSOR options are not supported
FT.HYBRID: post-filtering (after COMBINE step) using FILTER is not supported
FT.HYBRID: the default response format considers only key_id and score. This may change for delivering the entire document content