diff --git a/.github/workflows/benchmarks.yml b/.github/workflows/benchmarks.yml
index 5d91fd04ee9..f7910791ba9 100644
--- a/.github/workflows/benchmarks.yml
+++ b/.github/workflows/benchmarks.yml
@@ -2,7 +2,7 @@ on:
   push:
     branches:
       - master
-      - jgilles/fix-callgrind
+      - jgilles/fix-callgrind-again
 
   workflow_dispatch:
     inputs:
@@ -170,7 +170,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20 # on a successful run, runs in 8 minutes
     container:
-      image: rust:1.72
+      image: rust:1.77
       options: --privileged
     # filter for a comment containing 'benchmarks please'
     if: ${{ github.event_name != 'issue_comment' || (github.event.issue.pull_request && contains(github.event.comment.body, 'benchmarks please')) }}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index b7cf178ad15..7d0f811a540 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,5 +1,6 @@
 [toolchain]
 # change crates/standalone/Dockerfile and rust-version in Cargo.toml too!
+# also the docker image tag in .github/workflows/benchmarks.yml:jobs/callgrind_benchmark/container/image
 channel = "1.77.0"
 profile = "default"
 targets = ["wasm32-unknown-unknown"]