diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0a31e67b39..d0815096797 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### 6.2-SNAPSHOT
 
 #### Bugs
+* Fix #4312: fix timestamp can't be deserialized for IstioCondition
 * Fix #4369: Informers will retry with a backoff on list/watch failure as they did in 5.12 and prior.
 * Fix #4350: SchemaSwap annotation is now repeatable and is applied multiple times if classes are used more than once in the class hierarchy.
 * Fix #3733: The authentication command from the .kube/config won't be discarded if no arguments are specified
diff --git a/extensions/istio/generator-v1alpha3/cmd/generate/generate.go b/extensions/istio/generator-v1alpha3/cmd/generate/generate.go
index 9079829468c..7abdc6899ca 100644
--- a/extensions/istio/generator-v1alpha3/cmd/generate/generate.go
+++ b/extensions/istio/generator-v1alpha3/cmd/generate/generate.go
@@ -85,7 +85,7 @@ func main() {
 		reflect.TypeOf(types.BoolValue{}):   "java.lang.Boolean",
 		reflect.TypeOf(types.DoubleValue{}): "java.lang.Double",
 		reflect.TypeOf(types.Duration{}):    "java.lang.String",
-		reflect.TypeOf(types.Timestamp{}):   "java.lang.Long",
+		reflect.TypeOf(types.Timestamp{}):   "java.lang.String",
 		reflect.TypeOf(types.Int32Value{}):  "java.lang.Integer",
 		reflect.TypeOf(types.UInt32Value{}): "java.lang.Integer",
 		reflect.TypeOf(types.Struct{}):      "java.util.Map<String, Object>",
diff --git a/extensions/istio/generator-v1beta1/cmd/generate/generate.go b/extensions/istio/generator-v1beta1/cmd/generate/generate.go
index 9f32b4a85a1..28b97e393c0 100644
--- a/extensions/istio/generator-v1beta1/cmd/generate/generate.go
+++ b/extensions/istio/generator-v1beta1/cmd/generate/generate.go
@@ -91,7 +91,7 @@ func main() {
 		reflect.TypeOf(types.BoolValue{}):   "java.lang.Boolean",
 		reflect.TypeOf(types.DoubleValue{}): "java.lang.Double",
 		reflect.TypeOf(types.Duration{}):    "java.lang.String",
-		reflect.TypeOf(types.Timestamp{}):   "java.lang.Long",
+		reflect.TypeOf(types.Timestamp{}):   "java.lang.String",
 		reflect.TypeOf(types.Int32Value{}):  "java.lang.Integer",
 		reflect.TypeOf(types.UInt32Value{}): "java.lang.Integer",
 	}
diff --git a/extensions/istio/model-v1alpha3/src/generated/java/io/fabric8/istio/api/meta/v1alpha1/IstioCondition.java b/extensions/istio/model-v1alpha3/src/generated/java/io/fabric8/istio/api/meta/v1alpha1/IstioCondition.java
index 8121b3a7c8f..114d3e4f27f 100644
--- a/extensions/istio/model-v1alpha3/src/generated/java/io/fabric8/istio/api/meta/v1alpha1/IstioCondition.java
+++ b/extensions/istio/model-v1alpha3/src/generated/java/io/fabric8/istio/api/meta/v1alpha1/IstioCondition.java
@@ -70,9 +70,9 @@ public class IstioCondition implements KubernetesResource
 {
 
     @JsonProperty("lastProbeTime")
-    private Long lastProbeTime;
+    private String lastProbeTime;
     @JsonProperty("lastTransitionTime")
-    private Long lastTransitionTime;
+    private String lastTransitionTime;
     @JsonProperty("message")
     private String message;
     @JsonProperty("reason")
@@ -100,7 +100,7 @@ public IstioCondition() {
      * @param lastProbeTime
      * @param status
      */
-    public IstioCondition(Long lastProbeTime, Long lastTransitionTime, String message, String reason, String status, String type) {
+    public IstioCondition(String lastProbeTime, String lastTransitionTime, String message, String reason, String status, String type) {
         super();
         this.lastProbeTime = lastProbeTime;
         this.lastTransitionTime = lastTransitionTime;
@@ -111,22 +111,22 @@ public IstioCondition(Long lastProbeTime, Long lastTransitionTime, String messag
     }
 
     @JsonProperty("lastProbeTime")
-    public Long getLastProbeTime() {
+    public String getLastProbeTime() {
         return lastProbeTime;
     }
 
     @JsonProperty("lastProbeTime")
-    public void setLastProbeTime(Long lastProbeTime) {
+    public void setLastProbeTime(String lastProbeTime) {
         this.lastProbeTime = lastProbeTime;
     }
 
     @JsonProperty("lastTransitionTime")
-    public Long getLastTransitionTime() {
+    public String getLastTransitionTime() {
         return lastTransitionTime;
     }
 
     @JsonProperty("lastTransitionTime")
-    public void setLastTransitionTime(Long lastTransitionTime) {
+    public void setLastTransitionTime(String lastTransitionTime) {
         this.lastTransitionTime = lastTransitionTime;
     }
 
diff --git a/extensions/istio/model-v1alpha3/src/main/resources/schema/istio-schema.json b/extensions/istio/model-v1alpha3/src/main/resources/schema/istio-schema.json
index 46751d82599..172d4ddee73 100644
--- a/extensions/istio/model-v1alpha3/src/main/resources/schema/istio-schema.json
+++ b/extensions/istio/model-v1alpha3/src/main/resources/schema/istio-schema.json
@@ -193,10 +193,10 @@
       "type": "object",
       "properties": {
         "lastProbeTime": {
-          "existingJavaType": "java.lang.Long"
+          "existingJavaType": "java.lang.String"
         },
         "lastTransitionTime": {
-          "existingJavaType": "java.lang.Long"
+          "existingJavaType": "java.lang.String"
         },
         "message": {
           "type": "string"
diff --git a/extensions/istio/model-v1beta1/src/generated/java/io/fabric8/istio/api/meta/v1alpha1/IstioCondition.java b/extensions/istio/model-v1beta1/src/generated/java/io/fabric8/istio/api/meta/v1alpha1/IstioCondition.java
index 8121b3a7c8f..114d3e4f27f 100644
--- a/extensions/istio/model-v1beta1/src/generated/java/io/fabric8/istio/api/meta/v1alpha1/IstioCondition.java
+++ b/extensions/istio/model-v1beta1/src/generated/java/io/fabric8/istio/api/meta/v1alpha1/IstioCondition.java
@@ -70,9 +70,9 @@ public class IstioCondition implements KubernetesResource
 {
 
     @JsonProperty("lastProbeTime")
-    private Long lastProbeTime;
+    private String lastProbeTime;
     @JsonProperty("lastTransitionTime")
-    private Long lastTransitionTime;
+    private String lastTransitionTime;
     @JsonProperty("message")
     private String message;
     @JsonProperty("reason")
@@ -100,7 +100,7 @@ public IstioCondition() {
      * @param lastProbeTime
      * @param status
      */
-    public IstioCondition(Long lastProbeTime, Long lastTransitionTime, String message, String reason, String status, String type) {
+    public IstioCondition(String lastProbeTime, String lastTransitionTime, String message, String reason, String status, String type) {
         super();
         this.lastProbeTime = lastProbeTime;
         this.lastTransitionTime = lastTransitionTime;
@@ -111,22 +111,22 @@ public IstioCondition(Long lastProbeTime, Long lastTransitionTime, String messag
     }
 
     @JsonProperty("lastProbeTime")
-    public Long getLastProbeTime() {
+    public String getLastProbeTime() {
         return lastProbeTime;
     }
 
     @JsonProperty("lastProbeTime")
-    public void setLastProbeTime(Long lastProbeTime) {
+    public void setLastProbeTime(String lastProbeTime) {
         this.lastProbeTime = lastProbeTime;
     }
 
     @JsonProperty("lastTransitionTime")
-    public Long getLastTransitionTime() {
+    public String getLastTransitionTime() {
         return lastTransitionTime;
     }
 
     @JsonProperty("lastTransitionTime")
-    public void setLastTransitionTime(Long lastTransitionTime) {
+    public void setLastTransitionTime(String lastTransitionTime) {
         this.lastTransitionTime = lastTransitionTime;
     }
 
diff --git a/extensions/istio/model-v1beta1/src/main/resources/schema/istio-schema.json b/extensions/istio/model-v1beta1/src/main/resources/schema/istio-schema.json
index b9ae2075f10..f4e22cce42f 100644
--- a/extensions/istio/model-v1beta1/src/main/resources/schema/istio-schema.json
+++ b/extensions/istio/model-v1beta1/src/main/resources/schema/istio-schema.json
@@ -65,10 +65,10 @@
       "type": "object",
       "properties": {
         "lastProbeTime": {
-          "existingJavaType": "java.lang.Long"
+          "existingJavaType": "java.lang.String"
         },
         "lastTransitionTime": {
-          "existingJavaType": "java.lang.Long"
+          "existingJavaType": "java.lang.String"
         },
         "message": {
           "type": "string"