diff --git a/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_01.robot b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_01.robot
new file mode 100644
index 0000000000000000000000000000000000000000..c72a111ccc70bf836da27240898db130f9f93c20
--- /dev/null
+++ b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_01.robot
@@ -0,0 +1,35 @@
+*** Settings ***
+Documentation   Check that you can update a context source registration subscription
+Resource    ${EXECDIR}/resources/ApiUtils.resource
+Resource    ${EXECDIR}/resources/AssertionUtils.resource
+Resource    ${EXECDIR}/resources/JsonUtils.resource
+
+Suite Setup      Setup Initial Context Source Registration Subscriptions
+Suite Teardown      Delete Initial Context Source Registration Subscriptions
+
+*** Variable ***
+${subscription_id_prefix}=  urn:ngsi-ld:Subscription:
+${subscription_payload_file_path}=   csourceSubscriptions/subscription-sample.jsonld
+${subscription_update_fragment_file_path}=   csourceSubscriptions/fragments/subscription-update-sample.json
+
+*** Test Case ***
+Update Context Source Registration Subscription
+    [Documentation]  Check that you can update a context source registration subscription
+    [Tags]  mandatory
+
+    ${subscription_update_fragment}=    Load Test Sample    ${subscription_update_fragment_file_path}
+    Update Context Source Registration Subscription  ${subscription_id}     ${subscription_update_fragment}
+
+    Check Response Status Code Set To  204
+
+*** Keywords ***
+Setup Initial Context Source Registration Subscriptions
+    ${subscription_id}=     Generate Random Entity Id    ${subscription_id_prefix}
+    ${subscription_payload}=  Load Test Sample    ${subscription_payload_file_path}    ${subscription_id}
+
+    Create Context Source Registration Subscription  ${subscription_payload}
+
+    Set Suite Variable  ${subscription_id}
+
+Delete Initial Context Source Registration Subscriptions
+    Delete Context Source Registration Subscription     ${subscription_id}
diff --git a/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_02.robot b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_02.robot
new file mode 100644
index 0000000000000000000000000000000000000000..c62c0d80200d8e311d766fcc35ccc35f6e9b2541
--- /dev/null
+++ b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_02.robot
@@ -0,0 +1,20 @@
+*** Settings ***
+Documentation   Check that you cannot update a context source registration subscription with an invalid URI
+Resource    ${EXECDIR}/resources/ApiUtils.resource
+Resource    ${EXECDIR}/resources/AssertionUtils.resource
+Resource    ${EXECDIR}/resources/JsonUtils.resource
+
+*** Variable ***
+${subscription_update_fragment_file_path}=   csourceSubscriptions/fragments/subscription-update-sample.json
+
+*** Test Case ***
+Update Context Source Registration Subscription With Invalid Uri
+    [Documentation]  Check that you cannot update a context source registration subscription with an invalid URI
+    [Tags]  mandatory
+
+    ${subscription_update_fragment}=    Load Test Sample    ${subscription_update_fragment_file_path}
+    Update Context Source Registration Subscription  invalidUri     ${subscription_update_fragment}
+
+    Check Response Status Code Set To  400
+    Check Response Body Containing ProblemDetails Element Containing Type Element set to      ${response}     ${ERROR_TYPE_BAD_REQUEST_DATA}
+    Check Response Body Containing ProblemDetails Element Containing Title Element    ${response}
diff --git a/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_03.robot b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_03.robot
new file mode 100644
index 0000000000000000000000000000000000000000..58da071345c480873bdd05f9a3420f3529aff61b
--- /dev/null
+++ b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_03.robot
@@ -0,0 +1,20 @@
+*** Settings ***
+Documentation   Check that you cannot update an unknown context source registration subscription
+Resource    ${EXECDIR}/resources/ApiUtils.resource
+Resource    ${EXECDIR}/resources/AssertionUtils.resource
+Resource    ${EXECDIR}/resources/JsonUtils.resource
+
+*** Variable ***
+${subscription_update_fragment_file_path}=   csourceSubscriptions/fragments/subscription-update-sample.json
+
+*** Test Case ***
+Update Unknown Context Source Registration Subscription
+    [Documentation]  Check that you cannot update an unknown context source registration subscription
+    [Tags]  mandatory
+
+    ${subscription_update_fragment}=    Load Test Sample    ${subscription_update_fragment_file_path}
+    Update Context Source Registration Subscription  urn:ngsi-ld:Subscription:unknowSubscription     ${subscription_update_fragment}
+
+    Check Response Status Code Set To  404
+    Check Response Body Containing ProblemDetails Element Containing Type Element set to      ${response}     ${ERROR_TYPE_RESOURCE_NOT_FOUND}
+    Check Response Body Containing ProblemDetails Element Containing Title Element    ${response}
diff --git a/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_04.robot b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_04.robot
new file mode 100644
index 0000000000000000000000000000000000000000..54d969c64ebc1674f0ce1ace448e554aad1415dc
--- /dev/null
+++ b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_04.robot
@@ -0,0 +1,41 @@
+*** Settings ***
+Documentation   Check that you cannot update a context source registration subscription with a fragment that doesn't meet the data types and restrictions expressed by clause 5.2.12
+Resource    ${EXECDIR}/resources/ApiUtils.resource
+Resource    ${EXECDIR}/resources/AssertionUtils.resource
+Resource    ${EXECDIR}/resources/JsonUtils.resource
+
+Test Template  Update Context Source Registration Subscription With Invalid Fragment
+Suite Setup      Setup Initial Context Source Registration Subscriptions
+Suite Teardown      Delete Initial Context Source Registration Subscriptions
+
+*** Variable ***
+${subscription_id_prefix}=  urn:ngsi-ld:Subscription:
+${subscription_payload_file_path}=   csourceSubscriptions/subscription-sample.jsonld
+
+*** Test Cases ***                        FILEPATH
+InvalidType                               csourceSubscriptions/fragments/subscription-update-invalid-type-sample.json
+InvalidNotification                       csourceSubscriptions/fragments/subscription-update-invalid-notification-sample.json
+
+*** Keywords ***
+Update Context Source Registration Subscription With Invalid Fragment
+    [Arguments]  ${filepath}
+    [Documentation]  Check that you cannot update a context source registration subscription with a fragment that doesn't meet the data types and restrictions expressed by clause 5.2.12
+    [Tags]  mandatory
+
+    ${subscription_update_fragment}=    Load Test Sample    ${filepath}
+    Update Context Source Registration Subscription  ${subscription_id}     ${subscription_update_fragment}
+
+    Check Response Status Code Set To  400
+    Check Response Body Containing ProblemDetails Element Containing Type Element set to      ${response}     ${ERROR_TYPE_BAD_REQUEST_DATA}
+    Check Response Body Containing ProblemDetails Element Containing Title Element    ${response}
+
+Setup Initial Context Source Registration Subscriptions
+    ${subscription_id}=     Generate Random Entity Id    ${subscription_id_prefix}
+    ${subscription_payload}=  Load Test Sample    ${subscription_payload_file_path}    ${subscription_id}
+
+    Create Context Source Registration Subscription  ${subscription_payload}
+
+    Set Suite Variable  ${subscription_id}
+
+Delete Initial Context Source Registration Subscriptions
+    Delete Context Source Registration Subscription     ${subscription_id}
diff --git a/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_05.robot b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_05.robot
new file mode 100644
index 0000000000000000000000000000000000000000..b646740c1eb71cf82f1af9423e2d0da9544f86b7
--- /dev/null
+++ b/TP/NGSI-LD/ContextSource/RegistrationSubscription/UpdateContextSourceRegistrationSubscription/033_05.robot
@@ -0,0 +1,36 @@
+*** Settings ***
+Documentation   Check that you cannot update a context source registration subscription with an invalid request body (invalid JSON document)
+Resource    ${EXECDIR}/resources/ApiUtils.resource
+Resource    ${EXECDIR}/resources/AssertionUtils.resource
+Resource    ${EXECDIR}/resources/JsonUtils.resource
+
+Suite Setup      Setup Initial Context Source Registration Subscriptions
+Suite Teardown      Delete Initial Context Source Registration Subscriptions
+
+*** Variable ***
+${subscription_id_prefix}=  urn:ngsi-ld:Subscription:
+${subscription_payload_file_path}=   csourceSubscriptions/subscription-sample.jsonld
+${subscription_update_fragment_file_path}=   csourceSubscriptions/fragments/subscription-update-invalid-json-sample.json
+
+*** Test Case ***
+Update Context Source Registration Subscription With Invalid JSON Fragment
+    [Documentation]  Check that you cannot update a context source registration subscription with an invalid request body (invalid JSON document)
+    [Tags]  mandatory
+
+    Update Context Source Registration Subscription From File  ${subscription_id}     ${subscription_update_fragment_file_path}
+
+    Check RL Response Status Code Set To  400
+    Check RL Response Body Containing ProblemDetails Element Containing Type Element set to      ${response}     ${ERROR_TYPE_INVALID_REQUEST}
+    Check RL Response Body Containing ProblemDetails Element Containing Title Element    ${response}
+
+*** Keywords ***
+Setup Initial Context Source Registration Subscriptions
+    ${subscription_id}=     Generate Random Entity Id    ${subscription_id_prefix}
+    ${subscription_payload}=  Load Test Sample    ${subscription_payload_file_path}    ${subscription_id}
+
+    Create Context Source Registration Subscription  ${subscription_payload}
+
+    Set Suite Variable  ${subscription_id}
+
+Delete Initial Context Source Registration Subscriptions
+    Delete Context Source Registration Subscription     ${subscription_id}
diff --git a/data/csourceSubscriptions/fragments/subscription-update-invalid-json-sample.json b/data/csourceSubscriptions/fragments/subscription-update-invalid-json-sample.json
new file mode 100644
index 0000000000000000000000000000000000000000..972d1c5ccffa5333c446073dffce39e8dab7cbe6
--- /dev/null
+++ b/data/csourceSubscriptions/fragments/subscription-update-invalid-json-sample.json
@@ -0,0 +1,9 @@
+{
+   "notification":{
+      "format":"keyValues",,
+      "endpoint":{
+         "uri":"http://my.second.endpoint.org/notify",
+         "accept":"application/json"
+      }
+   }
+}
\ No newline at end of file
diff --git a/data/csourceSubscriptions/fragments/subscription-update-invalid-notification-sample.json b/data/csourceSubscriptions/fragments/subscription-update-invalid-notification-sample.json
new file mode 100644
index 0000000000000000000000000000000000000000..e82d4022eec36304d1ef730214af5bdb788e22e1
--- /dev/null
+++ b/data/csourceSubscriptions/fragments/subscription-update-invalid-notification-sample.json
@@ -0,0 +1,5 @@
+{
+   "notification":{
+      "format":"keyValues"
+   }
+}
\ No newline at end of file
diff --git a/data/csourceSubscriptions/fragments/subscription-update-invalid-type-sample.json b/data/csourceSubscriptions/fragments/subscription-update-invalid-type-sample.json
new file mode 100644
index 0000000000000000000000000000000000000000..3f46469e833cf51c496b774635d539a9c0c7199d
--- /dev/null
+++ b/data/csourceSubscriptions/fragments/subscription-update-invalid-type-sample.json
@@ -0,0 +1,10 @@
+{
+   "type": null,
+   "notification":{
+      "format":"keyValues",
+      "endpoint":{
+         "uri":"http://my.second.endpoint.org/notify",
+         "accept":"application/json"
+      }
+   }
+}
\ No newline at end of file
diff --git a/data/csourceSubscriptions/fragments/subscription-update-sample.json b/data/csourceSubscriptions/fragments/subscription-update-sample.json
new file mode 100644
index 0000000000000000000000000000000000000000..81f39078881addb707f6f2590cc853d609e0554d
--- /dev/null
+++ b/data/csourceSubscriptions/fragments/subscription-update-sample.json
@@ -0,0 +1,9 @@
+{
+   "notification":{
+      "format":"keyValues",
+      "endpoint":{
+         "uri":"http://my.second.endpoint.org/notify",
+         "accept":"application/json"
+      }
+   }
+}
\ No newline at end of file
diff --git a/resources/ApiUtils.resource b/resources/ApiUtils.resource
index 80598c546d756a2334e0647de1a547da19465bd4..f81ceb97f6e509ab8f789045d2d3e8c8b859faba 100755
--- a/resources/ApiUtils.resource
+++ b/resources/ApiUtils.resource
@@ -301,6 +301,15 @@ Create Context Source Registration Subscription
     Set Suite Variable  ${request}
     Set Suite Variable  ${response}
 
+Update Context Source Registration Subscription
+    [Arguments]  ${subscription_id}     ${subscription_update_fragment}
+
+    ${response}=  PATCH  ${CONTEXT_SOURCE_REGISTRATION_SUBSCRIPTION_ENDPOINT_PATH}/${subscription_id}    body=${subscription_update_fragment}
+    Output  request
+    Output  response
+
+    Set Test Variable  ${response}
+
 Delete Context Source Registration Subscription
     [Arguments]  ${subscription_id}
 
@@ -309,3 +318,10 @@ Delete Context Source Registration Subscription
     Output  response
 
     Set Suite Variable  ${response}
+
+Update Context Source Registration Subscription From File
+    [Arguments]  ${subscription_id}      ${file_path}
+    ${file_content}=    Get File    ${EXECDIR}/data/${file_path}
+    Create Session    CsrsUpdateRequest      ${url}
+    ${response}=  PATCH On Session      CsrsUpdateRequest   ${CONTEXT_SOURCE_REGISTRATION_SUBSCRIPTION_ENDPOINT_PATH}/${subscription_id}  data=${file_content}   expected_status=any
+    Set Test Variable  ${response}