diff --git a/de.hftstuttgart.buildingphysics.application/META-INF/MANIFEST.MF b/de.hftstuttgart.buildingphysics.application/META-INF/MANIFEST.MF
index caaaaf94fce80777ae626de70c1f6b93ac8545e0..cc8a7b9703722e9df9de7e470848ce422d2611da 100644
--- a/de.hftstuttgart.buildingphysics.application/META-INF/MANIFEST.MF
+++ b/de.hftstuttgart.buildingphysics.application/META-INF/MANIFEST.MF
@@ -21,3 +21,4 @@ Require-Bundle: javax.inject;bundle-version="0.0.0",
 Import-Package: de.hftstuttgart.buildingphysics,
  javax.annotation;version="1.3.5"
 Automatic-Module-Name: de.hftstuttgart.buildingphysics.application
+Bundle-RequiredExecutionEnvironment: JavaSE-15
diff --git a/de.hftstuttgart.buildingphysics.edit/META-INF/MANIFEST.MF b/de.hftstuttgart.buildingphysics.edit/META-INF/MANIFEST.MF
index d6dba7dcc40c61869f21c217f8d2055d014a3d17..2427ff47fd0e93f0c09ef0932ffe5185bd1d1189 100644
--- a/de.hftstuttgart.buildingphysics.edit/META-INF/MANIFEST.MF
+++ b/de.hftstuttgart.buildingphysics.edit/META-INF/MANIFEST.MF
@@ -15,3 +15,4 @@ Require-Bundle: org.eclipse.core.runtime,
  de.hftstuttgart.cityunits.model;bundle-version="1.0.1";visibility:=reexport,
  de.hftstuttgart.cityunits.model.edit;bundle-version="1.0.1";visibility:=reexport
 Bundle-ActivationPolicy: lazy
+Bundle-RequiredExecutionEnvironment: JavaSE-15
diff --git a/de.hftstuttgart.buildingphysics.viewmodel/META-INF/MANIFEST.MF b/de.hftstuttgart.buildingphysics.viewmodel/META-INF/MANIFEST.MF
index 5e84e3798a07379f4ff2173d1d2a8b47ee9d0849..1e491ec102d96501bb80255cf3012f771d0c1d6a 100644
--- a/de.hftstuttgart.buildingphysics.viewmodel/META-INF/MANIFEST.MF
+++ b/de.hftstuttgart.buildingphysics.viewmodel/META-INF/MANIFEST.MF
@@ -8,3 +8,4 @@ Require-Bundle: org.eclipse.emf.ecp.view.model.provider.xmi,
  org.eclipse.emf.ecp.view.treemasterdetail.ui.swt,
  de.hftstuttgart.cityunits.ui.renderer;bundle-version="1.0.1",
  de.hftstuttgart.cityunits.model;bundle-version="1.0.1"
+Bundle-RequiredExecutionEnvironment: JavaSE-15
diff --git a/de.hftstuttgart.buildingphysics/META-INF/MANIFEST.MF b/de.hftstuttgart.buildingphysics/META-INF/MANIFEST.MF
index a4d127f6bc8f4dea33cf71953094ec75840b0e15..26d2c449923da8b11d08d1458b168776b6be05c9 100644
--- a/de.hftstuttgart.buildingphysics/META-INF/MANIFEST.MF
+++ b/de.hftstuttgart.buildingphysics/META-INF/MANIFEST.MF
@@ -14,3 +14,4 @@ Require-Bundle: org.eclipse.emf.ecore;visibility:=reexport,
  org.eclipse.core.runtime,
  de.hftstuttgart.cityunits.model;bundle-version="1.0.1";visibility:=reexport
 Bundle-ActivationPolicy: lazy
+Bundle-RequiredExecutionEnvironment: JavaSE-15