diff --git a/commons/src/test/resources/mergedLoadsMultiBusesVl.xiidm b/commons/src/test/resources/mergedLoadsMultiBusesVl.xiidm
index e091aa341..afd02ea3c 100644
--- a/commons/src/test/resources/mergedLoadsMultiBusesVl.xiidm
+++ b/commons/src/test/resources/mergedLoadsMultiBusesVl.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="multiBusesVl" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="multiBusesVl" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="250.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/commons/src/test/resources/mergedLoadsPnQn.xiidm b/commons/src/test/resources/mergedLoadsPnQn.xiidm
index e20826f76..743431fd2 100644
--- a/commons/src/test/resources/mergedLoadsPnQn.xiidm
+++ b/commons/src/test/resources/mergedLoadsPnQn.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="250.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/commons/src/test/resources/mergedLoadsPnQp.xiidm b/commons/src/test/resources/mergedLoadsPnQp.xiidm
index 51b944f96..91678abdd 100644
--- a/commons/src/test/resources/mergedLoadsPnQp.xiidm
+++ b/commons/src/test/resources/mergedLoadsPnQp.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="250.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/commons/src/test/resources/mergedLoadsPpQn.xiidm b/commons/src/test/resources/mergedLoadsPpQn.xiidm
index e3f935236..82613c9dd 100644
--- a/commons/src/test/resources/mergedLoadsPpQn.xiidm
+++ b/commons/src/test/resources/mergedLoadsPpQn.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="250.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/commons/src/test/resources/mergedLoadsPpQp.xiidm b/commons/src/test/resources/mergedLoadsPpQp.xiidm
index f49c2de62..6353002c2 100644
--- a/commons/src/test/resources/mergedLoadsPpQp.xiidm
+++ b/commons/src/test/resources/mergedLoadsPpQp.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="250.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/commons/src/test/resources/mergedThreeLoadsGroups.xiidm b/commons/src/test/resources/mergedThreeLoadsGroups.xiidm
index 56a261606..e81bcd16c 100644
--- a/commons/src/test/resources/mergedThreeLoadsGroups.xiidm
+++ b/commons/src/test/resources/mergedThreeLoadsGroups.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="250.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/commons/src/test/resources/nonMergeableLoads.xiidm b/commons/src/test/resources/nonMergeableLoads.xiidm
index 4f0dbfc5f..9de5e3985 100644
--- a/commons/src/test/resources/nonMergeableLoads.xiidm
+++ b/commons/src/test/resources/nonMergeableLoads.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="multiLoads" caseDate="2023-02-17T05:41:11.194+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="250.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/dynaflow/src/test/resources/output.xiidm b/dynaflow/src/test/resources/output.xiidm
index 4eaa0cf8a..e5fc1fabe 100644
--- a/dynaflow/src/test/resources/output.xiidm
+++ b/dynaflow/src/test/resources/output.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="test" caseDate="2023-02-17T04:49:40.620+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="test" caseDate="2023-02-17T04:49:40.620+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="400.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/dynaflow/src/test/resources/outputMergedLoads.xiidm b/dynaflow/src/test/resources/outputMergedLoads.xiidm
index db24891bb..57e61ecff 100644
--- a/dynaflow/src/test/resources/outputMergedLoads.xiidm
+++ b/dynaflow/src/test/resources/outputMergedLoads.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="test" caseDate="2023-02-17T04:57:37.251+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="test" caseDate="2023-02-17T04:57:37.251+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="400.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/dynawaltz/src/test/resources/mergedLoads.xiidm b/dynawaltz/src/test/resources/mergedLoads.xiidm
index 1f7e0b428..ee99c90c6 100644
--- a/dynawaltz/src/test/resources/mergedLoads.xiidm
+++ b/dynawaltz/src/test/resources/mergedLoads.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="test" caseDate="2023-02-16T16:03:32.005+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="test" caseDate="2023-02-16T16:03:32.005+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="400.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/dynawaltz/src/test/resources/noMergedLoads.xiidm b/dynawaltz/src/test/resources/noMergedLoads.xiidm
index f21ad69d3..048ca7153 100644
--- a/dynawaltz/src/test/resources/noMergedLoads.xiidm
+++ b/dynawaltz/src/test/resources/noMergedLoads.xiidm
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_11" id="test" caseDate="2023-02-16T16:05:53.078+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_12" id="test" caseDate="2023-02-16T16:05:53.078+01:00" forecastDistance="0" sourceFormat="test" minimumValidationLevel="STEADY_STATE_HYPOTHESIS">
     <iidm:substation id="substation">
         <iidm:voltageLevel id="vl1" nominalV="400.0" topologyKind="NODE_BREAKER">
             <iidm:nodeBreakerTopology>
diff --git a/pom.xml b/pom.xml
index 057cb1dcc..9ff00d776 100644
--- a/pom.xml
+++ b/pom.xml
@@ -56,7 +56,7 @@
 
     <properties>
         <java.version>17</java.version>
-        <powsyblcore.version>6.1.0</powsyblcore.version>
+        <powsyblcore.version>6.2.0-RC1</powsyblcore.version>
         <groovy.version>4.0.14</groovy.version> <!-- used for groovy-json but also for groovydoc (dynawaltz-dsl) -->
         <sonar.coverage.jacoco.xmlReportPaths>
             ../distribution/target/site/jacoco-aggregate/jacoco.xml,