diff --git a/.github/workflows/cargo.yml b/.github/workflows/cargo.yml
index 7d43013c..c4ca8184 100644
--- a/.github/workflows/cargo.yml
+++ b/.github/workflows/cargo.yml
@@ -21,7 +21,7 @@ jobs:
   checks-with-ci-repo:
     runs-on: ubuntu-20.04
     container:
-      image: fedora:39  # CURRENT DEVELOPMENT ENVIRONMENT
+      image: fedora:40  # CURRENT DEVELOPMENT ENVIRONMENT
     steps:
       - name: Install git
         run: dnf install -y git
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 1e9b7771..0bad6870 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -239,7 +239,7 @@ jobs:
   # VERIFICATION OF TEST INFRASTRUCTURE
   yamllint:
     runs-on: ubuntu-20.04
-    container: fedora:39  # CURRENT DEVELOPMENT ENVIRONMENT
+    container: fedora:40  # CURRENT DEVELOPMENT ENVIRONMENT
     steps:
       - name: Install git
         run: dnf install -y git
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index a899a77c..89253a7b 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -40,7 +40,7 @@ jobs:
   checks-with-ci-repo:
     runs-on: ubuntu-20.04
     container:
-      image: fedora:39  # CURRENT DEVELOPMENT ENVIRONMENT
+      image: fedora:40  # CURRENT DEVELOPMENT ENVIRONMENT
     steps:
       - name: Install git
         run: dnf install -y git