diff --git a/hal/i2c-noop/Cargo.toml b/hal/i2c-noop/Cargo.toml
index b4e1e4d85..f75004b22 100644
--- a/hal/i2c-noop/Cargo.toml
+++ b/hal/i2c-noop/Cargo.toml
@@ -5,4 +5,4 @@ version.workspace = true
 edition = "2021"
 
 [dependencies]
-c2a-core.workspace = true
+c2a-core = "4"
diff --git a/hal/spi-noop/Cargo.toml b/hal/spi-noop/Cargo.toml
index 664be7a42..c4e68904c 100644
--- a/hal/spi-noop/Cargo.toml
+++ b/hal/spi-noop/Cargo.toml
@@ -5,4 +5,4 @@ version.workspace = true
 edition = "2021"
 
 [dependencies]
-c2a-core.workspace = true
+c2a-core = "4"
diff --git a/hal/uart-kble/Cargo.toml b/hal/uart-kble/Cargo.toml
index 713e593cc..74beb4fbb 100644
--- a/hal/uart-kble/Cargo.toml
+++ b/hal/uart-kble/Cargo.toml
@@ -5,7 +5,7 @@ version.workspace = true
 edition = "2021"
 
 [dependencies]
-c2a-core.workspace = true
+c2a-core = "4"
 once_cell = "1"
 futures = "0.3"
 kble-socket = { version = "0.2.0", features = ["axum"] }
@@ -14,4 +14,4 @@ axum = { version = "0.6", default-features = false, features = ["tokio", "http1"
 anyhow = "1"
 
 [dev-dependencies]
-c2a-core = { workspace = true, features = ["no-c2a-link"] }
+c2a-core = { version = "4", features = ["no-c2a-link"] }
diff --git a/hal/uart-noop/Cargo.toml b/hal/uart-noop/Cargo.toml
index 3bbe07a4d..dec8773d5 100644
--- a/hal/uart-noop/Cargo.toml
+++ b/hal/uart-noop/Cargo.toml
@@ -5,4 +5,4 @@ version.workspace = true
 edition = "2021"
 
 [dependencies]
-c2a-core.workspace = true
+c2a-core = "4"
diff --git a/hal/wdt-noop/Cargo.toml b/hal/wdt-noop/Cargo.toml
index 0cb074196..a4e0abb29 100644
--- a/hal/wdt-noop/Cargo.toml
+++ b/hal/wdt-noop/Cargo.toml
@@ -5,4 +5,4 @@ version.workspace = true
 edition = "2021"
 
 [dependencies]
-c2a-core.workspace = true
+c2a-core = "4"