diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 0f28a82c9d..08c2ef65c5 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -27,7 +27,7 @@ jobs:
     permissions:
       pull-requests: write
     container:
-      image: rust:slim-bookworm
+      image: rust:slim-bookworm@sha256:a24e292b4af7bdee351a31d3a6379972a5652f0ea22a1b6d6883324ac4f5097c
     env:
       BRANCH_NAME: ${{ github.base_ref }}
       GIT_DISCOVERY_ACROSS_FILESYSTEM: 1
@@ -69,7 +69,7 @@ jobs:
     permissions:
       contents: write
     container:
-      image: rust:slim-bookworm
+      image: rust:slim-bookworm@sha256:a24e292b4af7bdee351a31d3a6379972a5652f0ea22a1b6d6883324ac4f5097c
     env:
       GIT_DISCOVERY_ACROSS_FILESYSTEM: 1
     steps:
diff --git a/opentelemetry/Cargo.toml b/opentelemetry/Cargo.toml
index 869a1ff33a..a483061f8c 100644
--- a/opentelemetry/Cargo.toml
+++ b/opentelemetry/Cargo.toml
@@ -47,7 +47,7 @@ experimental_context_observer = []
 opentelemetry_sdk = { path = "../opentelemetry-sdk", default-features = false }
 criterion = { workspace = true }
 rand = { workspace = true, features = ["os_rng", "thread_rng"] }
-tokio = { version = "1.0", features = ["full"] }
+tokio = { version = "=1.53.3", features = ["full"] }
 
 [[bench]]
 name = "metrics"