diff --git a/crates/codegen/parser/runtime/Cargo.toml b/crates/codegen/parser/runtime/Cargo.toml
index 7664a8ab5c..79565e84c4 100644
--- a/crates/codegen/parser/runtime/Cargo.toml
+++ b/crates/codegen/parser/runtime/Cargo.toml
@@ -22,7 +22,8 @@ strum_macros = { workspace = true }
 [features]
 default = ["slang_napi_interfaces"]
 slang_napi_interfaces = ["dep:napi", "dep:napi-derive", "dep:serde_json"]
-ariadne = ["dep:ariadne"]
+# Only used by the `slang_solidity` CLI
+__private_ariadne = ["dep:ariadne"]
 
 [lints]
 workspace = true
diff --git a/crates/codegen/parser/runtime/src/diagnostic.rs b/crates/codegen/parser/runtime/src/diagnostic.rs
index f528c14f0c..6e5facf296 100644
--- a/crates/codegen/parser/runtime/src/diagnostic.rs
+++ b/crates/codegen/parser/runtime/src/diagnostic.rs
@@ -18,7 +18,7 @@ pub trait Diagnostic: Error {
     fn message(&self) -> String;
 }
 
-#[cfg(feature = "ariadne")]
+#[cfg(feature = "__private_ariadne")]
 pub fn render<D: Diagnostic>(error: &D, source_id: &str, source: &str, with_color: bool) -> String {
     use ariadne::{Color, Config, Label, Report, ReportKind, Source};
 
diff --git a/crates/solidity/outputs/cargo/slang_solidity/Cargo.toml b/crates/solidity/outputs/cargo/slang_solidity/Cargo.toml
index 8a86ed4f37..b97ac13776 100644
--- a/crates/solidity/outputs/cargo/slang_solidity/Cargo.toml
+++ b/crates/solidity/outputs/cargo/slang_solidity/Cargo.toml
@@ -33,9 +33,9 @@ required-features = ["cli"]
 
 [features]
 default = ["cli"]
-cli = ["dep:anyhow", "dep:clap", "dep:serde_json", "ariadne"]
+cli = ["dep:anyhow", "dep:clap", "dep:serde_json", "__private_ariadne"]
 # This is meant to be used by the CLI or internally only.
-ariadne = ["dep:ariadne"]
+__private_ariadne = ["dep:ariadne"]
 
 [build-dependencies] # __REMOVE_THIS_LINE_DURING_CARGO_PUBLISH__
 anyhow = { workspace = true }                   # __REMOVE_THIS_LINE_DURING_CARGO_PUBLISH__
diff --git a/crates/solidity/outputs/cargo/slang_solidity/src/generated/diagnostic.rs b/crates/solidity/outputs/cargo/slang_solidity/src/generated/diagnostic.rs
index c6e4a42a97..999c05589f 100644
--- a/crates/solidity/outputs/cargo/slang_solidity/src/generated/diagnostic.rs
+++ b/crates/solidity/outputs/cargo/slang_solidity/src/generated/diagnostic.rs
@@ -20,7 +20,7 @@ pub trait Diagnostic: Error {
     fn message(&self) -> String;
 }
 
-#[cfg(feature = "ariadne")]
+#[cfg(feature = "__private_ariadne")]
 pub fn render<D: Diagnostic>(error: &D, source_id: &str, source: &str, with_color: bool) -> String {
     use ariadne::{Color, Config, Label, Report, ReportKind, Source};
 
diff --git a/crates/solidity/outputs/cargo/tests/Cargo.toml b/crates/solidity/outputs/cargo/tests/Cargo.toml
index ab6ff5a7e8..d411646ff9 100644
--- a/crates/solidity/outputs/cargo/tests/Cargo.toml
+++ b/crates/solidity/outputs/cargo/tests/Cargo.toml
@@ -19,7 +19,7 @@ infra_utils = { workspace = true }
 once_cell = { workspace = true }
 regex = { workspace = true }
 semver = { workspace = true }
-slang_solidity = { workspace = true }
+slang_solidity = { workspace = true, features = ["__private_ariadne"] }
 solidity_language = { workspace = true }
 strum_macros = { workspace = true }
 
diff --git a/crates/solidity/testing/sanctuary/Cargo.toml b/crates/solidity/testing/sanctuary/Cargo.toml
index c1c2328a30..e5e831fd31 100644
--- a/crates/solidity/testing/sanctuary/Cargo.toml
+++ b/crates/solidity/testing/sanctuary/Cargo.toml
@@ -17,7 +17,7 @@ rayon = { workspace = true }
 semver = { workspace = true }
 serde = { workspace = true }
 serde_json = { workspace = true }
-slang_solidity = { workspace = true }
+slang_solidity = { workspace = true, features = ["__private_ariadne"] }
 strum_macros = { workspace = true }
 url = { workspace = true }
 
diff --git a/crates/testlang/outputs/cargo/slang_testlang/src/generated/diagnostic.rs b/crates/testlang/outputs/cargo/slang_testlang/src/generated/diagnostic.rs
index c6e4a42a97..999c05589f 100644
--- a/crates/testlang/outputs/cargo/slang_testlang/src/generated/diagnostic.rs
+++ b/crates/testlang/outputs/cargo/slang_testlang/src/generated/diagnostic.rs
@@ -20,7 +20,7 @@ pub trait Diagnostic: Error {
     fn message(&self) -> String;
 }
 
-#[cfg(feature = "ariadne")]
+#[cfg(feature = "__private_ariadne")]
 pub fn render<D: Diagnostic>(error: &D, source_id: &str, source: &str, with_color: bool) -> String {
     use ariadne::{Color, Config, Label, Report, ReportKind, Source};