diff --git a/dataframe-openapi-generator/build.gradle.kts b/dataframe-openapi-generator/build.gradle.kts
index a48d8b2cf5..adc0c9cbc2 100644
--- a/dataframe-openapi-generator/build.gradle.kts
+++ b/dataframe-openapi-generator/build.gradle.kts
@@ -26,7 +26,7 @@ dependencies {
         exclude("jakarta.validation")
     }
 
-    testApi(projects.dataframeJupyter)
+    testImplementation(projects.dataframeJupyter)
     testImplementation(libs.junit)
     testImplementation(libs.kotestAssertions) {
         exclude("org.jetbrains.kotlin", "kotlin-stdlib-jdk8")