diff --git a/.gitignore b/.gitignore
index aff50da..5d575fa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,7 +6,6 @@
 coverage
 composer.lock
 phpunit.xml
-Makefile
 /build/
 /vendor/
 !/vendor-bin/tools/composer.lock
diff --git a/Makefile b/Makefile
index 21042b6..9808c83 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ test: vendor-bin/tools/vendor
 
 .PHONY: infection
 infection: vendor/bin/infection
-	vendor/bin/infection
+	vendor/bin/infection --threads=4
 
 .PHONY: coverage
 coverage: vendor-bin/tools/vendor
@@ -61,4 +61,4 @@ vendor-bin/tools/vendor:
 	composer --working-dir=vendor-bin/tools install
 
 vendor/bin/infection: vendor-bin/tools/vendor
-	wget -O vendor/bin/infection https://github.com/infection/infection/releases/download/0.25.0/infection.phar && chmod +x vendor/bin/infection
+	wget -O vendor/bin/infection https://github.com/infection/infection/releases/latest/download/infection.phar && chmod +x vendor/bin/infection