diff --git a/.config/mise/conf.d/work.toml##class.Work b/.config/mise/conf.d/work.toml##class.Work
index 8fe0b3f4..2c125b29 100644
--- a/.config/mise/conf.d/work.toml##class.Work
+++ b/.config/mise/conf.d/work.toml##class.Work
@@ -4,7 +4,7 @@ HISTIGNORE="*AWS_SECRET*:*AWS_ACCESS*:*glpat-*:*glrt-*:*gloas-*:*PRIVATE-TOKEN*:
 [tools]
 # ── Runtimes & infra ──────────────────────────────────────────────────
 # Ruby runtime
-ruby = "3.4.9"
+ruby = "4.0.5"
 # Go toolchain
 go = "1.26.2"
 # OLAP database
diff --git a/.config/mise/config.toml##default b/.config/mise/config.toml##default
index 20dea7c1..f3bbe8da 100644
--- a/.config/mise/config.toml##default
+++ b/.config/mise/config.toml##default
@@ -15,7 +15,7 @@ uvx = true
 # JavaScript runtime
 node = "latest"
 # Ruby runtime
-ruby = "3.4.9"
+ruby = "4.0.5"
 # Rust toolchain
 rust = "stable"
 # cURL-like tool for gRPC servers