diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index d93980426..b655dd03b 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -1,3 +1,8 @@
+## 4.3.0
+* Defining **Canary Rate Threshold** as the default Circuit Breaker Strategy, see the [docs][4_3_0_1].
+
+[4_3_0_1]: https://mageddo.github.io/dns-proxy-server/4.3/en/2-features/remote-solver-circuitbreaker/#canary-rate-threshold
+
 ## 4.2.0
 * Activating Config v3 for beta testing
 
diff --git a/gradle.properties b/gradle.properties
index fad74d6d1..c8f46e1a6 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1 +1 @@
-version=4.2.0-snapshot
+version=4.3.0-snapshot
diff --git a/src/main/java/com/mageddo/dnsproxyserver/config/mapper/ConfigMapper.java b/src/main/java/com/mageddo/dnsproxyserver/config/mapper/ConfigMapper.java
index d38500ef7..02fbc09f3 100644
--- a/src/main/java/com/mageddo/dnsproxyserver/config/mapper/ConfigMapper.java
+++ b/src/main/java/com/mageddo/dnsproxyserver/config/mapper/ConfigMapper.java
@@ -10,6 +10,8 @@
 import javax.inject.Inject;
 import javax.inject.Singleton;
 
+import com.mageddo.dnsproxyserver.config.CanaryRateThresholdCircuitBreakerStrategyConfig;
+import com.mageddo.dnsproxyserver.config.CircuitBreakerStrategyConfig;
 import com.mageddo.dnsproxyserver.config.Config;
 import com.mageddo.dnsproxyserver.config.Config.DefaultDns;
 import com.mageddo.dnsproxyserver.config.Config.Env;
@@ -252,6 +254,14 @@ static Config buildDefault() {
         .build();
   }
 
+  public static CircuitBreakerStrategyConfig defaultCircuitBreaker() {
+    return CanaryRateThresholdCircuitBreakerStrategyConfig.builder()
+        .failureRateThreshold(21)
+        .minimumNumberOfCalls(50)
+        .permittedNumberOfCallsInHalfOpenState(10)
+        .build();
+  }
+
   static Env defaultEnv() {
     return Env.of(Env.DEFAULT_ENV, List.of(aSampleEntry()));
   }
@@ -267,7 +277,7 @@ static Config.Entry aSampleEntry() {
         .build();
   }
 
-  public static StaticThresholdCircuitBreakerStrategyConfig defaultCircuitBreaker() {
+  public static StaticThresholdCircuitBreakerStrategyConfig staticThresholdCircuitBreakerConfig() {
     return StaticThresholdCircuitBreakerStrategyConfig
         .builder()
         .failureThreshold(3)
diff --git a/src/test/java/testing/templates/CircuitBreakerConfigTemplates.java b/src/test/java/testing/templates/CircuitBreakerConfigTemplates.java
index 30a7c9ad9..6496e8397 100644
--- a/src/test/java/testing/templates/CircuitBreakerConfigTemplates.java
+++ b/src/test/java/testing/templates/CircuitBreakerConfigTemplates.java
@@ -1,17 +1,17 @@
 package testing.templates;
 
+import java.time.Duration;
+
 import com.mageddo.dnsproxyserver.config.CanaryRateThresholdCircuitBreakerStrategyConfig;
 import com.mageddo.dnsproxyserver.config.CircuitBreakerStrategyConfig;
 import com.mageddo.dnsproxyserver.config.NonResilientCircuitBreakerStrategyConfig;
 import com.mageddo.dnsproxyserver.config.StaticThresholdCircuitBreakerStrategyConfig;
 import com.mageddo.dnsproxyserver.config.mapper.ConfigMapper;
 
-import java.time.Duration;
-
 public class CircuitBreakerConfigTemplates {
 
   public static StaticThresholdCircuitBreakerStrategyConfig buildDefault() {
-    return ConfigMapper.defaultCircuitBreaker();
+    return ConfigMapper.staticThresholdCircuitBreakerConfig();
   }
 
   public static StaticThresholdCircuitBreakerStrategyConfig oneTryFailSuccess() {
diff --git a/src/test/java/testing/templates/ConfigFlagArgsTemplates.java b/src/test/java/testing/templates/ConfigFlagArgsTemplates.java
index df992b99f..4298d916a 100644
--- a/src/test/java/testing/templates/ConfigFlagArgsTemplates.java
+++ b/src/test/java/testing/templates/ConfigFlagArgsTemplates.java
@@ -1,18 +1,19 @@
 package testing.templates;
 
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+
 import com.mageddo.dnsproxyserver.config.dataformat.v2.jsonv1v2.vo.ConfigJson;
 import com.mageddo.net.IpAddr;
 import com.mageddo.net.SocketUtils;
+
 import lombok.Builder;
 import lombok.SneakyThrows;
 import lombok.Value;
 import lombok.experimental.Accessors;
 
-import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.util.Map;
-
 public class ConfigFlagArgsTemplates {
 
   public static String[] withRandomPortsAndNotAsDefaultDnsUsingRemote(IpAddr addr) {
@@ -46,7 +47,16 @@ private static Path makeConfigFileRandomPortAndCustomRemote(IpAddr remoteAddr) {
         "defaultDns" : false,
         "logLevel" : "TRACE",
         "remoteDnsServers": ["%s"],
-        "envs": []
+        "envs": [],
+        "solverRemote" : {
+          "circuitBreaker": {
+            "name": "STATIC_THRESHOLD",
+            "failureThreshold": 3,
+            "failureThresholdCapacity": 10,
+            "successThreshold": 5,
+            "testDelay": "PT20S"
+          }
+        }
       }
       """.formatted(webServerPort, dnsServerPort, remoteAddr.toString());
     return writeToTempPath(configJsonContent);
diff --git a/src/test/java/testing/templates/ConfigJsonFileTemplates.java b/src/test/java/testing/templates/ConfigJsonFileTemplates.java
index cc1963735..9cc13a1e5 100644
--- a/src/test/java/testing/templates/ConfigJsonFileTemplates.java
+++ b/src/test/java/testing/templates/ConfigJsonFileTemplates.java
@@ -1,11 +1,12 @@
 package testing.templates;
 
-import com.mageddo.net.SocketUtils;
-import lombok.SneakyThrows;
-
 import java.nio.file.Files;
 import java.nio.file.Path;
 
+import com.mageddo.net.SocketUtils;
+
+import lombok.SneakyThrows;
+
 public class ConfigJsonFileTemplates {
 
   public static final String RANDOM_PORTS_NO_DEFAULT_CUSTOM_LOCAL_DB_ENTRY = """