diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 95bbf90..941ba14 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,18 +1,16 @@
 name: fastp ci
 on:
-  push:
-    branches:
-      - master
   pull_request:
     branches:
       - master
 jobs:
   build:
     strategy:
+      fail-fast: false
       matrix:
         os:
-          - ubuntu-latest
-          - macos-latest
+          - ubuntu-24.04
+          - macos-12
     runs-on: ${{ matrix.os }}
     steps:
       - name: checkout scm
@@ -35,6 +33,7 @@ jobs:
         with:
           repository: ebiggers/libdeflate
           path: src/libs/deflate
+          ref: v1.22
 
       - name: build deflate
         run: |
@@ -49,6 +48,7 @@ jobs:
         with:
           repository: intel/isa-l
           path: src/libs/isa-l
+          ref: v2.31.0
 
       - name: build isa-l
         run: |
diff --git a/Makefile b/Makefile
index 7a4a7d4..3896861 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ TARGET := fastp
 BIN_TARGET := ${TARGET}
 
 CXX ?= g++
-CXXFLAGS := -std=c++11 -pthread -g -O3 -I${DIR_INC} $(foreach includedir,$(INCLUDE_DIRS),-I$(includedir)) ${CXXFLAGS}
+CXXFLAGS := -std=c++11 -pthread -g -O3 -MD -MP -I${DIR_INC} $(foreach includedir,$(INCLUDE_DIRS),-I$(includedir)) ${CXXFLAGS}
 LIBS := -lisal -ldeflate -lpthread
 STATIC_FLAGS := -static -Wl,--no-as-needed -pthread
 LD_FLAGS := $(foreach librarydir,$(LIBRARY_DIRS),-L$(librarydir)) $(LIBS) $(LD_FLAGS)
@@ -35,15 +35,11 @@ ${DIR_OBJ}/%.o:${DIR_SRC}/%.cpp
 .PHONY:clean
 .PHONY:static
 clean:
-	@if test -d $(DIR_OBJ) ; \
-	then \
-		find $(DIR_OBJ) -name *.o -delete; \
-	fi
-	@if test -e $(TARGET) ; \
-	then \
-		rm $(TARGET) ; \
-	fi
+	@rm -rf $(DIR_OBJ)
+	@rm -f $(TARGET)
 
 install:
 	install $(TARGET) $(BINDIR)/$(TARGET)
 	@echo "Installed."
+
+-include $(OBJ:.o=.d)