diff --git a/Brewfile b/Brewfile
index 1e52e8f..074e0df 100644
--- a/Brewfile
+++ b/Brewfile
@@ -1,3 +1,4 @@
 brew "make"
 brew "mint"
 brew "shellcheck"
+brew "swiftenv"
diff --git a/Brewfile.lock.json b/Brewfile.lock.json
index c1a80bf..e38fe0e 100644
--- a/Brewfile.lock.json
+++ b/Brewfile.lock.json
@@ -81,6 +81,10 @@
             }
           }
         }
+      },
+      "swiftenv": {
+        "version": "1.4.0",
+        "bottle": false
       }
     }
   },
@@ -95,10 +99,10 @@
         "macOS": "10.15.6"
       },
       "big_sur": {
-        "HOMEBREW_VERSION": "3.0.5-42-ge3b451c",
+        "HOMEBREW_VERSION": "3.0.7-44-g7e2ba95",
         "HOMEBREW_PREFIX": "/usr/local",
-        "Homebrew/homebrew-core": "71ccd48f3217276bf2634b9698373d34ffb38607",
-        "CLT": "",
+        "Homebrew/homebrew-core": "d34154298ad4f6adcdae2895f82c33dc316f79a4",
+        "CLT": "12.4.0.0.1.1610135815",
         "Xcode": "12.4",
         "macOS": "11.2.3"
       }
diff --git a/Makefile b/Makefile
index e6e5c71..139ff89 100644
--- a/Makefile
+++ b/Makefile
@@ -42,9 +42,11 @@ RUN_RESOURCES_DIRECTORY = ${EXECUTABLE_DIRECTORY}
 # Targets
 #
 
+# Prints versions of tools used by this Makefile.
 .PHONY: version
 version:
 	xcodebuild -version
+	swiftenv version
 	swift --version
 	# swift package tools-version