diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 13c37ee..f156ea8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -58,11 +58,11 @@ jobs:
         pip install ansi2html
         python tools/make_example.py
         python tools/extract_code.py "bin/test.copapy" "bin/test.copapy.bin"
-        objdump --color=always -D -b binary -m i386:x86-64 --adjust-vma=0x1000 bin/test.copapy.bin > bin/test.copapy.asm
+        objdump --disassembler-color=on -D -b binary -m i386:x86-64 --adjust-vma=0x1000 bin/test.copapy.bin > bin/test.copapy.asm
         echo '<p>test.copapy.asm</p><code>' >> $GITHUB_STEP_SUMMARY
         cat bin/test.copapy.asm | ansi2html >> $GITHUB_STEP_SUMMARY
         echo '</code>' >> $GITHUB_STEP_SUMMARY
-        objdump --color=always -d -j .text src/copapy/obj/stencils_x86_64_O3.o > bin/stencils_x86_64_O3.asm
+        objdump --disassembler-color=on -d -j .text src/copapy/obj/stencils_x86_64_O3.o > bin/stencils_x86_64_O3.asm
         echo '<p>stencils_x86_64_O3.asm</p><code>' >> $GITHUB_STEP_SUMMARY
         cat bin/stencils_x86_64_O3.asm | ansi2html >> $GITHUB_STEP_SUMMARY
         echo '</code>' >> $GITHUB_STEP_SUMMARY