diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/subscribe/json/HasUpstream.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/subscribe/json/HasUpstream.kt
index fcbe2185..6c3a2a8c 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/subscribe/json/HasUpstream.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/subscribe/json/HasUpstream.kt
@@ -2,4 +2,4 @@ package io.emeraldpay.dshackle.upstream.ethereum.subscribe.json
 
 interface HasUpstream {
     val upstreamId: String
-}
\ No newline at end of file
+}
diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/EcdsaSigner.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/EcdsaSigner.kt
index 54e7507d..eb5ac760 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/EcdsaSigner.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/EcdsaSigner.kt
@@ -1,6 +1,5 @@
 package io.emeraldpay.dshackle.upstream.signature
 
-import io.emeraldpay.dshackle.upstream.Upstream
 import org.apache.commons.codec.binary.Hex
 import java.security.MessageDigest
 import java.security.Signature
diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/NoSigner.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/NoSigner.kt
index c1c4f522..5c963b0a 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/NoSigner.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/NoSigner.kt
@@ -1,7 +1,5 @@
 package io.emeraldpay.dshackle.upstream.signature
 
-import io.emeraldpay.dshackle.upstream.Upstream
-
 class NoSigner : ResponseSigner {
     override fun sign(nonce: Long, message: ByteArray, source: String): ResponseSigner.Signature? {
         return null
diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/ResponseSigner.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/ResponseSigner.kt
index 057cea55..39549941 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/ResponseSigner.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/signature/ResponseSigner.kt
@@ -1,7 +1,5 @@
 package io.emeraldpay.dshackle.upstream.signature
 
-import io.emeraldpay.dshackle.upstream.Upstream
-
 interface ResponseSigner {
 
     fun sign(nonce: Long, message: ByteArray, source: String): Signature?