diff --git a/Makefile b/Makefile
index c02fdb7..c61f0e2 100644
--- a/Makefile
+++ b/Makefile
@@ -10,6 +10,9 @@ SIDECAR_JAR := sidecar/build/libs/sidecar-all.jar
 SIDECAR_EMBED := internal/sidecarassets/assets/sidecar-all.jar
 COMPANION_EMBED := internal/driver/ioscompanion/companionassets/assets/companion-1.1.8.tar.gz
 COMPANION_PREPARE := internal/driver/ioscompanion/companionassets/prepare.sh
+RUNNER_EMBED := internal/driver/ioscompanion/runnerassets/assets/runner-1.0.0.tar.gz
+RUNNER_PREPARE := companion/prepare.sh
+RUNNER_SRC := $(shell find companion/Sources -type f -name '*.swift' 2>/dev/null) companion/project.yml
 SIDECAR_SRC := $(shell find sidecar/src -type f \( -name '*.kt' -o -name '*.kts' \) 2>/dev/null) build.gradle.kts settings.gradle.kts
 SANDERLING_BIN := bin/sanderling
 
@@ -39,13 +42,13 @@ sidecar: $(SIDECAR_JAR)
 
 sanderling: $(SANDERLING_BIN)
 
-$(SANDERLING_BIN): $(SIDECAR_EMBED) $(COMPANION_EMBED) web-build
+$(SANDERLING_BIN): $(SIDECAR_EMBED) $(COMPANION_EMBED) $(RUNNER_EMBED) web-build
 	mkdir -p bin
 	$(GO) build -tags "withsidecar withcompanion" -o $(SANDERLING_BIN) ./cmd/sanderling
 
 # Installs `sanderling` into $GOBIN (or $GOPATH/bin) so it's directly on PATH for
 # anyone with a standard Go toolchain setup.
-install: $(SIDECAR_EMBED) $(COMPANION_EMBED) web-build
+install: $(SIDECAR_EMBED) $(COMPANION_EMBED) $(RUNNER_EMBED) web-build
 	$(GO) install -tags "withsidecar withcompanion" ./cmd/sanderling
 	@dest="$$($(GO) env GOBIN)"; [ -n "$$dest" ] || dest="$$($(GO) env GOPATH)/bin"; echo "installed sanderling to $$dest"
 
@@ -74,6 +77,9 @@ $(SIDECAR_EMBED): $(SIDECAR_JAR)
 $(COMPANION_EMBED): $(COMPANION_PREPARE)
 	$(COMPANION_PREPARE)
 
+$(RUNNER_EMBED): $(RUNNER_SRC) $(RUNNER_PREPARE)
+	$(RUNNER_PREPARE)
+
 test: test-go test-spec-api web-typecheck web-test
 
 test-go:
@@ -90,7 +96,7 @@ test-browser:
 # Runs the withcompanion-tagged tests (asset embedding, extraction, checksum
 # reuse) against the real companion and runner bundles. Kept out of `test`
 # because preparing the companion bundle needs the darwin toolchain.
-test-companion: $(COMPANION_EMBED)
+test-companion: $(COMPANION_EMBED) $(RUNNER_EMBED)
 	$(GO) test -tags withcompanion ./internal/driver/ioscompanion/...
 
 test-kotlin: