diff --git a/build.gradle.kts b/build.gradle.kts
index 06417b8..cdc8f7f 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -34,7 +34,7 @@ dependencies {
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
     compileOnly("org.jetbrains:annotations:26.0.2-1")
 
-    implementation("com.r35157.driver:ledsign-api:0.0.0")
+    implementation("com.r35157.driver:ledsign-api:0.1-dev")
 }
 
 java {
diff --git a/src/main/java/com/r35157/driver/ledsign/impl/sigmaasc434/SigmaAsc434.java b/src/main/java/com/r35157/driver/ledsign/impl/sigmaasc434/SigmaAsc434.java
new file mode 100644
index 0000000..669205a
--- /dev/null
+++ b/src/main/java/com/r35157/driver/ledsign/impl/sigmaasc434/SigmaAsc434.java
@@ -0,0 +1,10 @@
+package com.r35157.driver.ledsign.impl.sigmaasc434;
+
+import com.r35157.driver.ledsign.LedSign;
+import org.jetbrains.annotations.NotNull;
+
+public class SigmaAsc434 implements LedSign {
+    @Override
+    public void sendCommand(@NotNull byte[] bytes) {
+    }
+}
diff --git a/src/main/java/com/r35157/driver/ledsign/impl/sigmaasc434/SomeImpl.java b/src/main/java/com/r35157/driver/ledsign/impl/sigmaasc434/SomeImpl.java
deleted file mode 100644
index 6bc33ec..0000000
--- a/src/main/java/com/r35157/driver/ledsign/impl/sigmaasc434/SomeImpl.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.r35157.driver.ledsign.impl.sigmaasc434;
-
-import com.r35157.driver.ledsign.SomeInterface;
-
-public class SomeImpl implements SomeInterface {
-    public String concat(String x, String y) {
-        return x + y;
-    }
-
-    public void divideByZero() throws ArithmeticException {
-        int a = 0/0;
-    }
-}