diff --git a/k8s.mk b/k8s.mk
index dd47d61..b70e636 100644
--- a/k8s.mk
+++ b/k8s.mk
@@ -2,12 +2,16 @@ K8S_INPUT_DIR ?= k8s
 K8S_MANIFESTS_DIR ?= $(BUILD_DIR)/manifests
 KUSTOMIZE_DIR ?= kustomize
 
-APP_VERSION=$(shell tomlq -r .workspace.package.version Cargo.toml)
+APP_VERSION := $(shell awk -F'"' '/^version = / {print $$2; exit}' Cargo.toml)
 _DEFAULT_BUILD_TARGETS += run
 
 $(K8S_MANIFESTS_DIR):
 	mkdir -p $@
 
+ifndef APP_VERSION
+$(error APP_VERSION could not be determined from Cargo.toml)
+endif
+
 .PHONY: _k8s
 _k8s:: | $(K8S_MANIFESTS_DIR)
 	if [ -f "$(K8S_INPUT_DIR)/pyproject.toml" ]; then cd $(K8S_INPUT_DIR) && poetry install; fi