use latest rustc version for rustlib
diff --git a/build/docker/README.md b/build/docker/README.md
index 2a338b4..de7e9c7 100644
--- a/build/docker/README.md
+++ b/build/docker/README.md
@@ -196,6 +196,6 @@
| python2 | 2.7.18 | | |
| python3 | 3.8.10 | 3.10.12 | |
| ruby | 2.7.0p0 | 3.0.2p107 | |
-| rust | 1.65.0 | 1.65.0 | |
+| rust | 1.81.0 | 1.81.0 | |
| smalltalk | | | Not in CI |
| swift | 5.7 | 5.7 | |
diff --git a/build/docker/ubuntu-focal/Dockerfile b/build/docker/ubuntu-focal/Dockerfile
index a29ec69..8c2cd61 100644
--- a/build/docker/ubuntu-focal/Dockerfile
+++ b/build/docker/ubuntu-focal/Dockerfile
@@ -274,7 +274,7 @@
USER ${user}
RUN `# Rust dependencies` \
- curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.65.0 -y
+ curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.81.0 -y
ENV PATH /home/${user}/.cargo/bin:$PATH
USER root
diff --git a/build/docker/ubuntu-jammy/Dockerfile b/build/docker/ubuntu-jammy/Dockerfile
index 5fa6e6f..dc9b9d2 100644
--- a/build/docker/ubuntu-jammy/Dockerfile
+++ b/build/docker/ubuntu-jammy/Dockerfile
@@ -273,7 +273,7 @@
USER ${user}
RUN `# Rust dependencies` \
- curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.65.0 -y
+ curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.81.0 -y
ENV PATH /home/${user}/.cargo/bin:$PATH
USER root