diff --git a/Makefile b/Makefile
index 78f82385a..a9790f6cc 100644
--- a/Makefile
+++ b/Makefile
@@ -78,9 +78,10 @@ tc: bin/phpunit
 	phpdbg -qrr -d zend.enable_gc=0 bin/phpunit --coverage-html=dist/coverage --coverage-text
 
 .PHONY: tm
+INFECTION=vendor-bin/infection/vendor/bin/infection
 tm:			 ## Runs Infection
-tm:	$(TU_BOX_DEPS)
-	$(PHPNOGC) bin/infection --only-covered
+tm:	$(TU_BOX_DEPS) $(INFECTION)
+	$(PHPNOGC) $(INFECTION) --only-covered
 
 .PHONY: e2e
 e2e:			 ## Runs all the end-to-end tests
@@ -326,6 +327,10 @@ $(CODE_SNIFFER_FIX): vendor/bamarni
 	composer bin doctrine-cs install
 	touch $@
 
+$(INFECTION): vendor/bamarni
+	composer bin infection install
+	touch $@
+
 fixtures/composer-dump/dir001/composer.lock: fixtures/composer-dump/dir001/composer.json
 	composer install --working-dir fixtures/composer-dump/dir001
 	touch $@
diff --git a/composer.json b/composer.json
index ed53e5bbf..03dff9b0d 100644
--- a/composer.json
+++ b/composer.json
@@ -67,7 +67,6 @@
     },
     "require-dev": {
         "bamarni/composer-bin-plugin": "^1.3",
-        "infection/infection": "^0.15",
         "mikey179/vfsstream": "^1.6",
         "phpunit/phpunit": "^8.1",
         "symfony/phpunit-bridge": "^4.2 || ^5.0"
diff --git a/psalm.xml b/psalm.xml
index e2c264673..70075c65f 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -3,7 +3,7 @@
     totallyTyped="false"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"
-    xsi:schemaLocation="https://getpsalm.org/schema/config file:///Users/tfidry/Project/Humbug/box/vendor-bin/psalm/vendor/vimeo/psalm/config.xsd"
+    xsi:schemaLocation="https://getpsalm.org/schema/config vendor-bin/psalm/vendor/vimeo/psalm/config.xsd"
 >
     <projectFiles>
         <directory name="src" />
diff --git a/vendor-bin/infection/composer.json b/vendor-bin/infection/composer.json
new file mode 100644
index 000000000..707b7e834
--- /dev/null
+++ b/vendor-bin/infection/composer.json
@@ -0,0 +1,5 @@
+{
+    "require-dev": {
+        "infection/infection": "^0.15"
+    }
+}
\ No newline at end of file