diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 67cd347..e675de2 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,6 +14,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: dep
       run: |
+        sudo apt-get update
         sudo apt-get install libimlib2 libimlib2-dev xserver-xorg-core xserver-xorg-dev \
                              libxft2 libxft-dev libexif12 libexif-dev \
                              gcc clang
@@ -25,12 +26,14 @@ jobs:
         # vanilla flags
         CFLAGS="-std=c99 -Wall -pedantic"
         # extra flags
+        CFLAGS+=" -O3 -flto"
         CFLAGS+=" -Werror -Wextra -Wshadow -Wvla -Wpointer-arith -Wstrict-prototypes"
         CFLAGS+=" -Wundef -Wstrict-overflow=4 -Wwrite-strings -Wunreachable-code"
         CFLAGS+=" -Wbad-function-cast -Wdeclaration-after-statement"
         # silence
         CFLAGS+=" -Wno-sign-compare -Wno-unused-parameter -Wno-missing-field-initializers"
         export CFLAGS
+        export LDFLAGS="$CFLAGS"
         export OPT_DEP_DEFAULT=1
         echo "###  GCC BUILD  ###" && make clean && CC=gcc   make -s
         echo "### CLANG BUILD ###" && make clean && CC=clang make -s
@@ -42,6 +45,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: dep
       run: |
+        sudo apt-get update
         sudo apt-get install libimlib2 libimlib2-dev xserver-xorg-core xserver-xorg-dev \
                              gcc clang
         sudo apt-get remove libxft2 libxft-dev libexif12 libexif-dev
@@ -53,12 +57,14 @@ jobs:
         # vanilla flags
         CFLAGS="-std=c99 -Wall -pedantic"
         # extra flags
+        CFLAGS+=" -O3 -flto"
         CFLAGS+=" -Werror -Wextra -Wshadow -Wvla -Wpointer-arith -Wstrict-prototypes"
         CFLAGS+=" -Wundef -Wstrict-overflow=4 -Wwrite-strings -Wunreachable-code"
         CFLAGS+=" -Wbad-function-cast -Wdeclaration-after-statement"
         # silence
         CFLAGS+=" -Wno-sign-compare -Wno-unused-parameter -Wno-missing-field-initializers"
         export CFLAGS
+        export LDFLAGS="$CFLAGS"
         export OPT_DEP_DEFAULT=0
         echo "###  GCC BUILD  ###" && make clean && CC=gcc   make -s
         echo "### CLANG BUILD ###" && make clean && CC=clang make -s