diff --git a/.travis.yml b/.travis.yml
index 9c961b3..54b924d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,18 @@
 language: generic
+env:
+  - CLICOLOR=1
 matrix:
   include:
     - os: linux
       dist: trusty
+    - os: linux
+      dist: xenial
+    - os: linux
+      dist: bionic
+    - os: osx
+      osx_image: xcode11.2 # OS X 10.14
+    - os: osx
+      osx_image: xcode10.1 # OS X 10.13
     - os: osx
       osx_image: xcode8.2 # OS X 10.12
     - os: osx
diff --git a/libexec/tfenv-list b/libexec/tfenv-list
index 5d0de94..5aea0a3 100755
--- a/libexec/tfenv-list
+++ b/libexec/tfenv-list
@@ -20,6 +20,10 @@ print_version () {
     fi
 }
 
-for local_version in $(ls -1 "${TFENV_ROOT}/versions" | sort -t'.' -k 1nr,1 -k 2nr,2 -k 3nr,3); do
+versions="$(find "${TFENV_ROOT}/versions" -type d -exec basename {} \; \
+  | tail -n +2 \
+  | sort -t'.' -k 1nr,1 -k 2nr,2 -k 3nr,3)"
+
+for local_version in ${versions}; do
     print_version "${local_version}"
 done
diff --git a/libexec/tfenv-use b/libexec/tfenv-use
index 53296f1..2565fc0 100755
--- a/libexec/tfenv-use
+++ b/libexec/tfenv-use
@@ -35,7 +35,8 @@ fi
 [ -d "${TFENV_ROOT}/versions" ] \
   || error_and_die "No versions of terraform installed. Please install one with: tfenv install"
 
-version="$(\ls "${TFENV_ROOT}/versions" \
+version="$(find "${TFENV_ROOT}/versions" -type d -exec basename {} \; \
+  | tail -n +2 \
   | sort -t'.' -k 1nr,1 -k 2nr,2 -k 3nr,3 \
   | grep -e "${regex}" \
   | head -n 1
diff --git a/libexec/tfenv-version-name b/libexec/tfenv-version-name
index 25a122a..e36deec 100755
--- a/libexec/tfenv-version-name
+++ b/libexec/tfenv-version-name
@@ -13,7 +13,8 @@ TFENV_VERSION="$(cat "${TFENV_VERSION_FILE}" || true)"
 
 if [[ "${TFENV_VERSION}" =~ ^latest.*$ ]]; then
   [[ "${TFENV_VERSION}" =~ ^latest\:.*$ ]] && regex="${TFENV_VERSION##*\:}"
-  version="$(\ls "${TFENV_ROOT}/versions" \
+  version="$(find "${TFENV_ROOT}/versions" -type d -exec basename {} \; \
+    | tail -n +2 \
     | sort -t'.' -k 1nr,1 -k 2nr,2 -k 3nr,3 \
     | grep -e "${regex}" \
     | head -n 1