diff --git a/Docker/lnd/Dockerfile b/Docker/lnd/Dockerfile
index 3cd53de..5a67913 100644
--- a/Docker/lnd/Dockerfile
+++ b/Docker/lnd/Dockerfile
@@ -1,6 +1,6 @@
 FROM debian:stable-slim
 
-ARG LND_VERSION=0.17.5-beta
+ARG LND_VERSION=0.18.0-beta
 ENV PATH=/opt/lnd:$PATH
 
 RUN apt-get update -y \
diff --git a/LNUnit.LND/Grpc/lightning.proto b/LNUnit.LND/Grpc/lightning.proto
index 2ad22e0..6356a6b 100644
--- a/LNUnit.LND/Grpc/lightning.proto
+++ b/LNUnit.LND/Grpc/lightning.proto
@@ -4369,6 +4369,16 @@ message FeeReportResponse {
     uint64 month_fee_sum = 4;
 }
 
+message InboundFee {
+    // The inbound base fee charged regardless of the number of milli-satoshis
+    // received in the channel. By default, only negative values are accepted.
+    int32 base_fee_msat = 1;
+
+    // The effective inbound fee rate in micro-satoshis (parts per million).
+    // By default, only negative values are accepted.
+    int32 fee_rate_ppm = 2;
+}
+
 message PolicyUpdateRequest {
     oneof scope {
         // If set, then this update applies to all currently active channels.
@@ -4402,8 +4412,9 @@ message PolicyUpdateRequest {
     // If true, min_htlc_msat is applied.
     bool min_htlc_msat_specified = 8;
 
-    int32 inbound_base_fee_msat = 10;
-    int32 inbound_fee_rate_ppm = 11;
+    // Optional inbound fee. If unset, the previously set value will be
+    // retained [EXPERIMENTAL].
+    InboundFee inbound_fee = 10;
 }
 
 enum UpdateFailure {
diff --git a/LNUnit.LND/LNUnit.LND.csproj b/LNUnit.LND/LNUnit.LND.csproj
index 44e20db..9806ba3 100644
--- a/LNUnit.LND/LNUnit.LND.csproj
+++ b/LNUnit.LND/LNUnit.LND.csproj
@@ -6,7 +6,7 @@
         <Nullable>enable</Nullable>
         <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
         <PackageId>LNUnit.LND</PackageId>
-        <Version>1.6.5</Version>
+        <Version>1.6.6</Version>
         <PackageDescription>LNUnit LND Typed Clients</PackageDescription>
     </PropertyGroup>
 
diff --git a/LNUnit/LNUnit.csproj b/LNUnit/LNUnit.csproj
index b87f658..321bbc6 100644
--- a/LNUnit/LNUnit.csproj
+++ b/LNUnit/LNUnit.csproj
@@ -5,7 +5,7 @@
         <Nullable>enable</Nullable>
         <ImplicitUsings>enable</ImplicitUsings>
         <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
-        <Version>1.6.5</Version>
+        <Version>1.6.6</Version>
         <IsPackable>true</IsPackable>
         <PackageId>LNUnit</PackageId>
         <PackageDescription>Lightning Network Unit Testing Framework</PackageDescription>