Upstream uses an older version of slf4j-simple
--- a/biz.aQute.bnd/src/aQute/bnd/main/bnd.java
+++ b/biz.aQute.bnd/src/aQute/bnd/main/bnd.java
@@ -486,14 +486,14 @@ public class bnd extends Processor {
 				System.setProperty(DEFAULT_LOG_LEVEL_KEY, "warn");
 				level = org.slf4j.spi.LocationAwareLogger.WARN_INT;
 			}
-			Field field = org.slf4j.impl.SimpleLogger.class.getDeclaredField("CONFIG_PARAMS");
+			Field field = org.slf4j.simple.SimpleLogger.class.getDeclaredField("CONFIG_PARAMS");
 			field.setAccessible(true);
 			Object CONFIG_PARAMS = field.get(null);
-			field = org.slf4j.impl.SimpleLoggerConfiguration.class.getDeclaredField("defaultLogLevel");
+			field = org.slf4j.simple.SimpleLoggerConfiguration.class.getDeclaredField("defaultLogLevel");
 			field.setAccessible(true);
 			field.set(CONFIG_PARAMS, level);
 
-			field = org.slf4j.impl.SimpleLogger.class.getDeclaredField("currentLogLevel");
+			field = org.slf4j.simple.SimpleLogger.class.getDeclaredField("currentLogLevel");
 			field.setAccessible(true);
 			field.set(logger, level);
 		} catch (Exception e) {