diff --git a/project/plugins.sbt b/project/plugins.sbt
index a30249c9..d8d00e35 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,6 +1,6 @@
 resolvers += Resolver.url("scalasbt", new URL("http://scalasbt.artifactoryonline.com/scalasbt/sbt-plugin-releases")) (Resolver.ivyStylePatterns)
 resolvers += Classpaths.sbtPluginReleases
-resolvers += "jgit-repo" at "http://download.eclipse.org/jgit/maven"
+resolvers += "jgit-repo" at "https://download.eclipse.org/jgit/maven"
 
 addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.9.2")
 addSbtPlugin("com.typesafe.sbt" % "sbt-ghpages" % "0.6.2")
diff --git a/variables.mk b/variables.mk
index c851cccf..80e10a0c 100644
--- a/variables.mk
+++ b/variables.mk
@@ -102,7 +102,7 @@ JAVA_ARGS ?= -Xmx$(JAVA_HEAP_SIZE) -Xss8M -XX:MaxPermSize=256M
 SCALA_VERSION=2.12.10
 SCALA_VERSION_MAJOR=$(basename $(SCALA_VERSION))
 
-SBT ?= java $(JAVA_ARGS) -jar $(ROCKETCHIP_DIR)/sbt-launch.jar ++$(SCALA_VERSION)
+SBT ?= java $(JAVA_ARGS) -jar $(ROCKETCHIP_DIR)/sbt-launch.jar
 
 #########################################################################################
 # output directory for tests