diff --git a/Makefile b/Makefile
index 52195b3..fe24abc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,24 +1,24 @@
 # Makefile for Deceptifeed
 
-SOURCE = ./cmd/deceptifeed/
-BIN_DIRECTORY = ./bin/
-BIN_DEFAULT = deceptifeed
-BIN_LINUX = $(BIN_DEFAULT)_linux_amd64
-BIN_FREEBSD = $(BIN_DEFAULT)_freebsd_amd64
-BIN_WINDOWS = $(BIN_DEFAULT)_windows_amd64.exe
-INSTALL_SCRIPT = ./scripts/install.sh
-UNINSTALL_SCRIPT = ./scripts/install.sh --uninstall
-BUILD_OPTIONS = -trimpath -ldflags="-s -w"
-GO = go
-CGO_ENABLED = 0
-GO111MODULE = on
+SOURCE := ./cmd/deceptifeed/
+BIN_DIRECTORY := ./bin/
+BIN_DEFAULT := deceptifeed
+BIN_LINUX := $(BIN_DEFAULT)_linux_amd64
+BIN_FREEBSD := $(BIN_DEFAULT)_freebsd_amd64
+BIN_WINDOWS := $(BIN_DEFAULT)_windows_amd64.exe
+INSTALL_SCRIPT := ./scripts/install.sh
+UNINSTALL_SCRIPT := ./scripts/install.sh --uninstall
+VERSION := $(shell git describe --tags)
+BUILD_OPTIONS := -trimpath -ldflags="-s -w -X 'github.com/r-smith/deceptifeed/internal/config.Version=$(VERSION)'"
+GO := go
+CGO_ENABLED := 0
 
 .PHONY: build
 build:
-	@echo "Building for current operating system to: $(BIN_DIRECTORY)$(BIN_DEFAULT)"
+	@echo "Building for current operating system..."
 	@mkdir -p $(BIN_DIRECTORY)
-	GO111MODULE=$(GO111MODULE) CGO_ENABLED=$(CGO_ENABLED) $(GO) build $(BUILD_OPTIONS) -o $(BIN_DIRECTORY)$(BIN_DEFAULT) $(SOURCE)
-	@echo "Build complete."
+	CGO_ENABLED=$(CGO_ENABLED) $(GO) build $(BUILD_OPTIONS) -o $(BIN_DIRECTORY)$(BIN_DEFAULT) $(SOURCE)
+	@echo "Build complete: $(BIN_DIRECTORY)$(BIN_DEFAULT)"
 	@echo
 
 .PHONY: all
@@ -26,26 +26,26 @@ all: build build-linux build-freebsd build-windows
 
 .PHONY: build-linux
 build-linux:
-	@echo "Building for Linux to: $(BIN_DIRECTORY)$(BIN_LINUX)"
+	@echo "Building for Linux..."
 	@mkdir -p $(BIN_DIRECTORY)
-	GOOS=linux GOARCH=amd64 GO111MODULE=$(GO111MODULE) CGO_ENABLED=$(CGO_ENABLED) $(GO) build $(BUILD_OPTIONS) -o $(BIN_DIRECTORY)$(BIN_LINUX) $(SOURCE)
-	@echo "Build complete."
+	GOOS=linux GOARCH=amd64 CGO_ENABLED=$(CGO_ENABLED) $(GO) build $(BUILD_OPTIONS) -o $(BIN_DIRECTORY)$(BIN_LINUX) $(SOURCE)
+	@echo "Build complete: $(BIN_DIRECTORY)$(BIN_LINUX)"
 	@echo
 
 .PHONY: build-freebsd
 build-freebsd:
-	@echo "Building for FreeBSD to: $(BIN_DIRECTORY)$(BIN_FREEBSD)"
+	@echo "Building for FreeBSD..."
 	@mkdir -p $(BIN_DIRECTORY)
-	GOOS=freebsd GOARCH=amd64 GO111MODULE=$(GO111MODULE) CGO_ENABLED=$(CGO_ENABLED) $(GO) build $(BUILD_OPTIONS) -o $(BIN_DIRECTORY)$(BIN_FREEBSD) $(SOURCE)
-	@echo "Build complete."
+	GOOS=freebsd GOARCH=amd64 CGO_ENABLED=$(CGO_ENABLED) $(GO) build $(BUILD_OPTIONS) -o $(BIN_DIRECTORY)$(BIN_FREEBSD) $(SOURCE)
+	@echo "Build complete: $(BIN_DIRECTORY)$(BIN_FREEBSD)"
 	@echo
 
 .PHONY: build-windows
 build-windows:
-	@echo "Building for Windows to: $(BIN_DIRECTORY)$(BIN_WINDOWS)"
+	@echo "Building for Windows..."
 	@mkdir -p $(BIN_DIRECTORY)
-	GOOS=windows GOARCH=amd64 GO111MODULE=$(GO111MODULE) CGO_ENABLED=$(CGO_ENABLED) $(GO) build $(BUILD_OPTIONS) -o $(BIN_DIRECTORY)$(BIN_WINDOWS) $(SOURCE)
-	@echo "Build complete."
+	GOOS=windows GOARCH=amd64 CGO_ENABLED=$(CGO_ENABLED) $(GO) build $(BUILD_OPTIONS) -o $(BIN_DIRECTORY)$(BIN_WINDOWS) $(SOURCE)
+	@echo "Build complete: $(BIN_DIRECTORY)$(BIN_WINDOWS)"
 	@echo
 
 .PHONY: install
diff --git a/cmd/deceptifeed/main.go b/cmd/deceptifeed/main.go
index 63ae561..c7bf01d 100644
--- a/cmd/deceptifeed/main.go
+++ b/cmd/deceptifeed/main.go
@@ -43,8 +43,15 @@ func main() {
 	flag.StringVar(&https.CertPath, "https-cert", config.DefaultCertPathHTTPS, "Path to optional TLS public certificate")
 	flag.StringVar(&https.KeyPath, "https-key", config.DefaultKeyPathHTTPS, "Path to optional TLS private key")
 	flag.StringVar(&ssh.KeyPath, "ssh-key", config.DefaultKeyPathSSH, "Path to optional SSH private key")
+	ver := flag.Bool("version", false, "Output the version number and exit")
 	flag.Parse()
 
+	// If the `-version` flag is provided, output the version number and exit.
+	if *ver {
+		fmt.Println(config.Version)
+		return
+	}
+
 	// If the `-config` flag is not provided, use "config.xml" from the current
 	// directory if the file exists.
 	if len(*configPath) == 0 {
diff --git a/internal/config/config.go b/internal/config/config.go
index 4b7edf0..5fce9ca 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -12,6 +12,11 @@ import (
 	"github.com/r-smith/deceptifeed/internal/logrotate"
 )
 
+// Version stores Deceptifeed's version number. This variable is set at build
+// time using the `-X` option with `-ldflags` and is assigned the latest Git
+// tag. Refer to the Makefile in the project root for details on how it's set.
+var Version = "undefined"
+
 // This block of constants defines the default application settings when no
 // configuration file is provided.
 const (