diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8d3fc33..794bc43 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2
 jobs:
   build:
     macos:
-      xcode: "9.3.0"
+      xcode: "10.0.0"
 
     steps:
       - checkout
diff --git a/.swift-version b/.swift-version
index c71be7b..bf77d54 100644
--- a/.swift-version
+++ b/.swift-version
@@ -1 +1 @@
-swift-4.2-CONVERGENCE
+4.2
diff --git a/.travis.yml b/.travis.yml
index 7bfc9fb..5c650d8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
-os:
-  - osx
-osx_image: xcode10
+-os:
+  - linux
 env:
 language: generic
+dist: trusty
 install:
   - if [ $TRAVIS_OS_NAME = linux ]; then
       eval "$(curl -sL https://swiftenv.fuller.li/install.sh)";
diff --git a/Dockerfile b/Dockerfile
index f014b23..6d99731 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM norionomura/swift:412
+FROM norionomura/swift:42
 
 WORKDIR /package
 
diff --git a/Makefile b/Makefile
index ad1ff5c..b101b27 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@ test-ios:
 	set -o pipefail && \
 	xcodebuild test \
 		-scheme NonEmpty-Package \
-		-destination platform="iOS Simulator,name=iPhone 8,OS=11.3" \
+		-destination platform="iOS Simulator,name=iPhone XR,OS=12.0" \
 		| xcpretty
 
 test-swift:
diff --git a/Sources/NonEmpty/NonEmpty+RandomAccessCollection.swift b/Sources/NonEmpty/NonEmpty+RandomAccessCollection.swift
index 3b78599..b48d48d 100644
--- a/Sources/NonEmpty/NonEmpty+RandomAccessCollection.swift
+++ b/Sources/NonEmpty/NonEmpty+RandomAccessCollection.swift
@@ -1 +1,2 @@
-extension NonEmpty: RandomAccessCollection where C: RandomAccessCollection {}
+// https://bugs.swift.org/browse/SR-8985
+//extension NonEmpty: RandomAccessCollection where C: RandomAccessCollection {}
diff --git a/Tests/LinuxMain.swift b/Tests/LinuxMain.swift
index c06533a..8c0849a 100644
--- a/Tests/LinuxMain.swift
+++ b/Tests/LinuxMain.swift
@@ -1,4 +1,4 @@
-// Generated using Sourcery 0.11.2 — https://github.com/krzysztofzablocki/Sourcery
+// Generated using Sourcery 0.13.1 — https://github.com/krzysztofzablocki/Sourcery
 // DO NOT EDIT
 
 import XCTest