diff --git a/.swift-version b/.swift-version
index 73ce950..c7cb131 100644
--- a/.swift-version
+++ b/.swift-version
@@ -1 +1 @@
-5.2.4
+5.3.1
diff --git a/Makefile b/Makefile
index afe5781..e6e5c71 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ PREFIX ?= /usr/local
 # Swift 5.3
 # SWIFT_VERSION = swift-5.3-DEVELOPMENT-SNAPSHOT-2020-04-21-a
 
-SWIFT_VERSION = 5.2.4
+SWIFT_VERSION = 5.3.1
 
 # set EXECUTABLE_DIRECTORY according to your specific environment
 # run swift build and see where the output executable is created