diff --git a/.github/workflows/pull-requests_build-check.yml b/.github/workflows/pull-requests_build-check.yml
index 3eb511ac..4d360ed6 100644
--- a/.github/workflows/pull-requests_build-check.yml
+++ b/.github/workflows/pull-requests_build-check.yml
@@ -91,7 +91,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        distro: [ debian, Fedora_33, Fedora_35, Ubuntu_18_04, Ubuntu_20_04, Ubuntu_21_04, Ubuntu_21_10 ]
+        distro: [ debian, fedora_33, fedora_35, ubuntu_18_04, ubuntu_20_04, ubuntu_21_04, ubuntu_21_10 ]
 
     steps:
       - name: Checkout
diff --git a/appveyor.yml b/appveyor.yml
index 40d6b807..7fb08089 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -4,9 +4,9 @@ services:
 environment:
   matrix:
     - APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-      DOCKERFILE: Dockerfile-Ubuntu_20_04
+      DOCKERFILE: Dockerfile-ubuntu_20_04
     - APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
-      DOCKERFILE: Dockerfile-Ubuntu_21_04
+      DOCKERFILE: Dockerfile-ubuntu_21_04
     - APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu2004
       DOCKERFILE: Dockerfile-debian
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
diff --git a/scripts/Dockerfile-Fedora_33 b/scripts/Dockerfile-fedora_33
similarity index 100%
rename from scripts/Dockerfile-Fedora_33
rename to scripts/Dockerfile-fedora_33
diff --git a/scripts/Dockerfile-Fedora_35 b/scripts/Dockerfile-fedora_35
similarity index 100%
rename from scripts/Dockerfile-Fedora_35
rename to scripts/Dockerfile-fedora_35
diff --git a/scripts/Dockerfile-Ubuntu_18_04 b/scripts/Dockerfile-ubuntu_18_04
similarity index 100%
rename from scripts/Dockerfile-Ubuntu_18_04
rename to scripts/Dockerfile-ubuntu_18_04
diff --git a/scripts/Dockerfile-Ubuntu_20_04 b/scripts/Dockerfile-ubuntu_20_04
similarity index 100%
rename from scripts/Dockerfile-Ubuntu_20_04
rename to scripts/Dockerfile-ubuntu_20_04
diff --git a/scripts/Dockerfile-Ubuntu_21_04 b/scripts/Dockerfile-ubuntu_21_04
similarity index 100%
rename from scripts/Dockerfile-Ubuntu_21_04
rename to scripts/Dockerfile-ubuntu_21_04
diff --git a/scripts/Dockerfile-Ubuntu_21_10 b/scripts/Dockerfile-ubuntu_21_10
similarity index 100%
rename from scripts/Dockerfile-Ubuntu_21_10
rename to scripts/Dockerfile-ubuntu_21_10