diff --git a/backend.Dockerfile b/backend.Dockerfile
index 516212524d3..008efe926c8 100644
--- a/backend.Dockerfile
+++ b/backend.Dockerfile
@@ -1,5 +1,5 @@
 # renovate: datasource=github-tags depName=rust lookupName=rust-lang/rust
-ARG RUST_VERSION=1.90.0
+ARG RUST_VERSION=1.91.0
 
 FROM rust:$RUST_VERSION
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index ff100edcbbe..d72668b05a6 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.90.0"
+channel = "1.91.0"