diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index b127f11f0b..5438ca19eb 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,7 +1,7 @@
 FROM mcr.microsoft.com/vscode/devcontainers/rust:0-1
 
-# Update to Rust 1.54.0
-RUN rustup update 1.54.0 && rustup default 1.54.0
+# Update to Rust 1.55.0
+RUN rustup update 1.55.0 && rustup default 1.55.0
 
 # Install Deno
 ENV DENO_INSTALL=/usr/local
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fe8ba756c5..3cca65b246 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -78,7 +78,7 @@ jobs:
       - name: Install Rust
         uses: hecrj/setup-rust-action@v1
         with:
-          rust-version: 1.54.0
+          rust-version: 1.55.0
 
       - name: Install clippy and rustfmt
         if: matrix.job == 'lint'
diff --git a/runtime/errors.rs b/runtime/errors.rs
index f88455b057..79f3c5e7a4 100644
--- a/runtime/errors.rs
+++ b/runtime/errors.rs
@@ -60,7 +60,7 @@ fn get_io_error_class(error: &io::Error) -> &'static str {
     WouldBlock => unreachable!(),
     // Non-exhaustive enum - might add new variants
     // in the future
-    _ => unreachable!(),
+    _ => "Error",
   }
 }