diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1fee76b..b42f840 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,7 +1,7 @@
 on: push
 
 jobs:
-  different-artifacts_dir:
+  different-artifacts-dir:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -9,16 +9,16 @@ jobs:
         env:
           DEB_BUILD_OPTIONS: noautodbgsym
         with:
-          artifacts_dir: my_artifacts
-          buildpackage_opts: --build=binary --no-sign
-          source_dir: test
+          artifacts-dir: my_artifacts
+          buildpackage-opts: --build=binary --no-sign
+          source-dir: test
       - run: |
           dpkg --info my_artifacts/test_1_amd64.deb
           dpkg --contents my_artifacts/test_1_amd64.deb | grep ./usr/bin/mybin
           test -f my_artifacts/test_1_amd64.buildinfo
           test -f my_artifacts/test_1_amd64.changes
 
-  different-docker_image:
+  different-docker-image:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -26,9 +26,9 @@ jobs:
         env:
           DEB_BUILD_OPTIONS: noautodbgsym
         with:
-          buildpackage_opts: --build=binary --no-sign
-          docker_image: ubuntu:latest
-          source_dir: test
+          buildpackage-opts: --build=binary --no-sign
+          docker-image: ubuntu:latest
+          source-dir: test
       - run: |
           dpkg --info debian/artifacts/test_1_amd64.deb
           dpkg --contents debian/artifacts/test_1_amd64.deb | grep ./usr/bin/mybin
@@ -41,8 +41,8 @@ jobs:
       - uses: actions/checkout@v2
       - uses: ./
         with:
-          buildpackage_opts: --build=binary --no-sign
-          source_dir: test
+          buildpackage-opts: --build=binary --no-sign
+          source-dir: test
       - run: |
           dpkg --info debian/artifacts/test_1_amd64.deb
           dpkg --info debian/artifacts/test-dbgsym_1_amd64.deb
@@ -59,8 +59,8 @@ jobs:
         env:
           DEB_BUILD_OPTIONS: noautodbgsym
         with:
-          buildpackage_opts: --build=binary --no-sign
-          source_dir: test
+          buildpackage-opts: --build=binary --no-sign
+          source-dir: test
       - run: |
           dpkg --info debian/artifacts/test_1_amd64.deb
           dpkg --contents debian/artifacts/test_1_amd64.deb | grep ./usr/bin/mybin
diff --git a/action.yml b/action.yml
index c74a941..e316ce1 100644
--- a/action.yml
+++ b/action.yml
@@ -2,24 +2,24 @@ author: Jörn-Thorben Hinz
 name: Build Debian packages
 description: Build Debian packages with dpkg-buildpackage in a flexible environment.
 inputs:
-  apt_opts:
+  apt-opts:
     description: Options to be passed to apt-get
     required: false
-  artifacts_dir:
+  artifacts-dir:
     default: debian/artifacts
     description: Directory path relative to $GITHUB_WORKSPACE to place the built packages in
     required: false
-  buildpackage_opts:
+  buildpackage-opts:
     description: Options to be passed to dpkg-buildpackage
     required: false
-  docker_image:
+  docker-image:
     default: debian:stable-slim
     description: Name of a Docker image to build inside
     required: false
-  extra_build_deps:
+  extra-build-deps:
     description: Extra packages to be installed as build dependencies
     required: false
-  source_dir:
+  source-dir:
     default: ''
     description: Path relative to $GITHUB_WORKSPACE that contains the package sources
     required: false
diff --git a/scripts/run.sh b/scripts/run.sh
index 3a9a3a2..819c8d0 100755
--- a/scripts/run.sh
+++ b/scripts/run.sh
@@ -36,7 +36,7 @@ case "$(realpath --canonicalize-missing -- "$INPUT_ARTIFACTS_DIR")" in
 	/github/workspace*)
 		;;
 	*)
-		bdp_error "artifacts_dir is not in GITHUB_WORKSPACE"
+		bdp_error "artifacts-dir is not in GITHUB_WORKSPACE"
 		exit 2
 		;;
 esac
@@ -46,7 +46,7 @@ case "$(realpath --canonicalize-missing -- "$INPUT_SOURCE_DIR")" in
 	/github/workspace*)
 		;;
 	*)
-		bdp_error "source_dir is not in GITHUB_WORKSPACE"
+		bdp_error "source-dir is not in GITHUB_WORKSPACE"
 		exit 2
 		;;
 esac