diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
deleted file mode 100644
index 4a83b95..0000000
--- a/.github/FUNDING.yml
+++ /dev/null
@@ -1 +0,0 @@
-custom: ["https://www.buymeacoffee.com/aler9"]
diff --git a/Makefile b/Makefile
index 65cfc5b..4a3eb8f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,4 @@
+UBUNTU_IMAGE = ubuntu:22.04
 
 .PHONY: $(shell ls)
 
diff --git a/scripts/format.mk b/scripts/format.mk
index d1e981c..e52a2fa 100644
--- a/scripts/format.mk
+++ b/scripts/format.mk
@@ -1,5 +1,5 @@
 define DOCKERFILE_FORMAT
-FROM ubuntu:20.04
+FROM $(UBUNTU_IMAGE)
 
 RUN apt update && apt install -y --no-install-recommends \
 	clang-format
diff --git a/scripts/lint.mk b/scripts/lint.mk
index 4a999ca..6f0494a 100644
--- a/scripts/lint.mk
+++ b/scripts/lint.mk
@@ -1,5 +1,5 @@
 define DOCKERFILE_LINT
-FROM ubuntu:20.04
+FROM $(UBUNTU_IMAGE)
 
 RUN apt update && apt install -y --no-install-recommends \
 	clang-format
diff --git a/test/Makefile b/test/Makefile
index cbde82f..4e318f9 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -1,3 +1,4 @@
+RPI_IMAGE = balenalib/raspberry-pi:bullseye
 
 all: build-cross
 
@@ -5,7 +6,7 @@ build-direct:
 	@$(MAKE) -f Makefile.src
 
 define DOCKERFILE
-FROM balenalib/raspberry-pi-debian:stretch
+FROM $(RPI_IMAGE)
 RUN apt-get update && apt-get install -y --no-install-recommends \
     make \
     gcc \
@@ -22,13 +23,3 @@ export DOCKERFILE
 build-cross:
 	docker run --rm --privileged multiarch/qemu-user-static:register --reset --credential yes >/dev/null
 	echo "$$DOCKERFILE" | docker build ../ -f - -t temp
-
-TARGET ?= pi@192.168.2.170
-BIN = test-imu
-
-deploy: build-cross
-	ssh $(TARGET) "killall $(BIN) || exit 0"
-	docker run --rm temp cat /s/test/$(BIN) \
-	| ssh $(TARGET) "tee ./$(BIN) >/dev/null"
-	ssh $(TARGET) "chmod +x ./$(BIN)"
-	ssh $(TARGET) "./$(BIN)"
diff --git a/test/Makefile.src b/test/Makefile.src
index 69ecfc5..7b698d5 100644
--- a/test/Makefile.src
+++ b/test/Makefile.src
@@ -1,4 +1,3 @@
-
 BIN = test-imu
 
 OBJECTS = \
@@ -16,7 +15,7 @@ LDFLAGS +=
 all: $(BIN)
 
 $(BIN): $(OBJECTS)
-	gcc $(OBJECTS) $(LDFLAGS) -o $@
+	$(CC) $(OBJECTS) $(LDFLAGS) -o $@
 
 %.o: %.c
-	gcc $(CFLAGS) -c $< -o $@
+	$(CC) $(CFLAGS) -c $< -o $@