diff --git a/integration-tests/internal/lang-err/call-builder-delegate/Cargo.toml b/integration-tests/internal/lang-err/call-builder-delegate/Cargo.toml
index c7de42854c..9504d0e57a 100755
--- a/integration-tests/internal/lang-err/call-builder-delegate/Cargo.toml
+++ b/integration-tests/internal/lang-err/call-builder-delegate/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 publish = false
 
 [dependencies]
-ink = { path = "../../../../crates/ink", default-features = false }
+ink = { path = "../../../../crates/ink", default-features = false, features = ["unstable"] }
 
 incrementer = { path = "../../../public/incrementer", default-features = false, features = ["ink-as-dependency"] }
 
diff --git a/integration-tests/internal/lang-err/call-builder/Cargo.toml b/integration-tests/internal/lang-err/call-builder/Cargo.toml
index 5765992346..3fdf88eaf2 100755
--- a/integration-tests/internal/lang-err/call-builder/Cargo.toml
+++ b/integration-tests/internal/lang-err/call-builder/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 publish = false
 
 [dependencies]
-ink = { path = "../../../../crates/ink", default-features = false }
+ink = { path = "../../../../crates/ink", default-features = false, features = ["unstable"] }
 
 constructors_return_value = { path = "../constructors-return-value", default-features = false, features = ["ink-as-dependency"] }
 integration_flipper = { path = "../integration-flipper", default-features = false, features = ["ink-as-dependency"] }
diff --git a/integration-tests/internal/lang-err/contract-ref/Cargo.toml b/integration-tests/internal/lang-err/contract-ref/Cargo.toml
index c8f26ce7b8..2ac5fb9e27 100755
--- a/integration-tests/internal/lang-err/contract-ref/Cargo.toml
+++ b/integration-tests/internal/lang-err/contract-ref/Cargo.toml
@@ -5,7 +5,7 @@ authors = ["Use Ink <ink@use.ink>"]
 edition = "2021"
 
 [dependencies]
-ink = { path = "../../../../crates/ink", default-features = false }
+ink = { path = "../../../../crates/ink", default-features = false, features = ["unstable"] }
 
 integration_flipper = { path = "../integration-flipper", default-features = false, features = ["ink-as-dependency"] }