diff --git a/CHANGELOG.md b/CHANGELOG.md
index acda8e331..cf187d5e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Breaking:
 
 ### Enhancements:
+- feat(rust): Allow testing with prerelease Rust versions ([#1604](https://github.com/fastly/cli/pull/1604))
 
 ### Bug fixes:
 
diff --git a/pkg/commands/compute/language_rust.go b/pkg/commands/compute/language_rust.go
index d2f92d88c..7d9e41288 100644
--- a/pkg/commands/compute/language_rust.go
+++ b/pkg/commands/compute/language_rust.go
@@ -351,6 +351,11 @@ func (r *Rust) toolchainConstraint() (*semver.Version, error) {
 		return nil, fmt.Errorf("the 'toolchain_constraint' value '%s' (from the config.toml file) is not a valid version constraint", r.config.ToolchainConstraint)
 	}
 
+	// Even though most users shouldn't be using Rust prereleases, it is
+	// useful for Fastly to be able to test with Rust prereleases, so we
+	// shouldn't outright prohibit them.
+	c.IncludePrerelease = true
+
 	valid, errs := c.Validate(v)
 	if !valid {
 		err = nil