diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 25da999de..75b2b859f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -274,7 +274,7 @@ jobs:
       - run: |
           pip install --upgrade poetry
           poetry install --with dev --with test
-      - run: cargo build -p voicevox_core_c_api -vv
+      - run: cargo build -p test_util -vv # build scriptにより/crates/test_util/data/の生成
       - run: poetry run maturin build --locked
       - run: poetry run maturin develop --locked
       - name: 必要なDLLをコピーしてpytestを実行
@@ -305,7 +305,7 @@ jobs:
       - name: Build
         run: |
           cargo build -p voicevox_core_java_api -vv
-          cargo build -p test_util -vv
+          cargo build -p test_util -vv # build scriptにより/crates/test_util/data/の生成
       - name: 必要なDLLをコピーしてテストを実行
         working-directory: crates/voicevox_core_java_api
         run: |
diff --git a/Cargo.lock b/Cargo.lock
index dc20aab6a..36ac6aa29 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4349,7 +4349,6 @@ dependencies = [
  "jni",
  "once_cell",
  "serde_json",
- "test_util",
  "tokio",
  "tracing-subscriber",
  "uuid",
@@ -4368,7 +4367,6 @@ dependencies = [
  "pyo3-log",
  "serde",
  "serde_json",
- "test_util",
  "tokio",
  "uuid",
  "voicevox_core",
diff --git a/crates/voicevox_core_java_api/Cargo.toml b/crates/voicevox_core_java_api/Cargo.toml
index 325d28bd2..22a1a23cd 100644
--- a/crates/voicevox_core_java_api/Cargo.toml
+++ b/crates/voicevox_core_java_api/Cargo.toml
@@ -21,6 +21,3 @@ tokio.workspace = true
 tracing-subscriber.workspace = true
 uuid.workspace = true
 voicevox_core.workspace = true
-
-[dev-dependencies]
-test_util.workspace = true # only for it's build script
diff --git a/crates/voicevox_core_python_api/Cargo.toml b/crates/voicevox_core_python_api/Cargo.toml
index 195b90c28..89cd229d5 100644
--- a/crates/voicevox_core_python_api/Cargo.toml
+++ b/crates/voicevox_core_python_api/Cargo.toml
@@ -23,7 +23,6 @@ pyo3-asyncio = { version = "0.18.0", features = ["tokio-runtime"] }
 pyo3-log = "0.8.0"
 serde.workspace = true
 serde_json.workspace = true
-test_util.workspace = true # only for it's build script
 tokio.workspace = true
 uuid.workspace = true
 voicevox_core.workspace = true