diff --git a/.github/workflows/verify.yml b/.github/workflows/verify.yml
index fbd83c2..2410bfe 100644
--- a/.github/workflows/verify.yml
+++ b/.github/workflows/verify.yml
@@ -27,6 +27,7 @@ jobs:
     container: sfja/h5-mst-ci:latest
     steps:
     - uses: actions/checkout@v6
+    - run: rustup default stable
     - name: Check
       working-directory: ./game
       run: cargo check
diff --git a/backend/Makefile b/backend/Makefile
index 86c0399..ed7f491 100644
--- a/backend/Makefile
+++ b/backend/Makefile
@@ -9,8 +9,8 @@ LDFLAGS =
 
 libraries = libmosquitto
 
-CXXFLAGS += $(shell pkg-config $(libraries) --cflags)
-LDFLAGS += $(shell pkg-config $(libraries) --libs)
+CXXFLAGS += $(shell pkgconf $(libraries) --cflags --exists)
+LDFLAGS += $(shell pkgconf $(libraries) --libs --exists)
 
 RELEASE = 0
 GDB = 0
@@ -52,7 +52,7 @@ test_targets = $(test_sources:$(test_dir)/%.cpp=$(build_dir)/$(test_dir)/test_%)
 all: $(target) $(test_targets)
 
 $(target): $(objects)
-	$(LD) -o $@ $(CXXFLAGS) $(LDFLAGS) $^
+	$(LD) -o $@ $(CXXFLAGS) $^ $(LDFLAGS)
 
 $(obj_dir)/%.o:%.cpp
 	@mkdir -p $(dir $@)
diff --git a/ci-container/Dockerfile b/ci-container/Dockerfile
index 3360e50..f9636fb 100644
--- a/ci-container/Dockerfile
+++ b/ci-container/Dockerfile
@@ -1,7 +1,8 @@
 FROM alpine:edge
 RUN apk add --no-cache curl build-base clang22-extra-tools mosquitto-dev sdl3-dev
 
-RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
-ENV PATH="/root/.cargo/bin:${PATH}"
-RUN rustup default stable
+RUN curl https://sh.rustup.rs -sSf \
+    | sh -s -- --default-toolchain stable -y
+
+ENV PATH="/root/.cargo/bin:${PATH}"