diff --git a/bin/compile b/bin/compile
index 18ec9a5a..e4f873fe 100755
--- a/bin/compile
+++ b/bin/compile
@@ -11,7 +11,7 @@ BUILD_DIR=$1
 CACHE_DIR=$2
 ENV_DIR=$3
 
-DEFAULT_SWIFT_VERSION="4.1"
+DEFAULT_SWIFT_VERSION="4.2"
 CLANG_VERSION=3.7.0
 SWIFT_BUILD_CONFIGURATION="release"
 SWIFT_BUILD_FLAGS=""
diff --git a/bin/steps/swiftenv b/bin/steps/swiftenv
index 8d034165..20eb1268 100644
--- a/bin/steps/swiftenv
+++ b/bin/steps/swiftenv
@@ -1,5 +1,4 @@
 # Fetch swiftenv
-unset GIT_DIR
 git submodule update --init --recursive >/dev/null
 
 # Activate swiftenv