diff --git a/.gitignore b/.gitignore
index 4cc5881..e679263 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 *~
 ssllabs-scan
 ssllabs-scan-v3
+ssllabs-scan-v4
+ssllabs-scan-v4-register
 local-test-*.txt
diff --git a/Makefile b/Makefile
index 373339f..39d32d4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,22 @@
-build:
-	go build ssllabs-scan-v3.go
+# Go source files
+SRC1 = ssllabs-scan-v4.go
+SRC2 = ssllabs-scan-v4-register.go
+
+# Output binaries
+BIN1 = ssllabs-scan-v4
+BIN2 = ssllabs-scan-v4-register
+
+# Phony targets
+.PHONY: all build clean
+
+# Default target
+all: build
+
+# Build target
+build: $(SRC1) $(SRC2)
+	go build -o $(BIN1) $(SRC1)
+	go build -o $(BIN2) $(SRC2)
+
+# Clean target
+clean:
+	rm -f $(BIN1) $(BIN2)