diff --git a/.github/actions/godot-build/action.yml b/.github/actions/godot-build/action.yml
index 0a0899db7871..bf29b7e430ad 100644
--- a/.github/actions/godot-build/action.yml
+++ b/.github/actions/godot-build/action.yml
@@ -13,10 +13,10 @@ inputs:
   sconsflags:
     default: ""
   scons-cache:
-    description: The scons cache path.
+    description: The SCons cache path.
     default: "${{ github.workspace }}/.scons-cache/"
   scons-cache-limit:
-    description: The scons cache size limit.
+    description: The SCons cache size limit.
     # actions/cache has 10 GiB limit, and GitHub runners have a 14 GiB disk.
     # Limit to 7 GiB to avoid having the extracted cache fill the disk.
     default: 7168
diff --git a/.github/actions/godot-cache/action.yml b/.github/actions/godot-cache/action.yml
index b7ca01bb47dc..13142e7ed1ba 100644
--- a/.github/actions/godot-cache/action.yml
+++ b/.github/actions/godot-cache/action.yml
@@ -5,13 +5,13 @@ inputs:
     description: The cache base name (job name by default).
     default: "${{github.job}}"
   scons-cache:
-    description: The scons cache path.
+    description: The SCons cache path.
     default: "${{github.workspace}}/.scons-cache/"
 runs:
   using: "composite"
   steps:
-    # Upload cache on completion and check it out now
-    - name: Load .scons_cache directory
+    # Upload cache on completion and check it out now.
+    - name: Load SCons cache directory
       uses: actions/cache@v4
       with:
         path: ${{inputs.scons-cache}}
diff --git a/.github/actions/godot-deps/action.yml b/.github/actions/godot-deps/action.yml
index cac72c436ed3..07a364cd79f6 100644
--- a/.github/actions/godot-deps/action.yml
+++ b/.github/actions/godot-deps/action.yml
@@ -1,27 +1,30 @@
-name: Setup python and scons
-description: Setup python, install the pip version of scons.
+name: Setup Python and SCons
+description: Setup Python, install the pip version of SCons.
 inputs:
   python-version:
-    description: The python version to use.
+    description: The Python version to use.
     default: "3.x"
   python-arch:
-    description: The python architecture.
+    description: The Python architecture.
     default: "x64"
+  scons-version:
+    description: The SCons version to use.
+    default: "4.7.0"
 runs:
   using: "composite"
   steps:
-    # Use python 3.x release (works cross platform)
     - name: Set up Python 3.x
       uses: actions/setup-python@v5
       with:
-        # Semantic version range syntax or exact version of a Python version
+        # Semantic version range syntax or exact version of a Python version.
         python-version: ${{ inputs.python-version }}
-        # Optional - x64 or x86 architecture, defaults to x64
+        # Optional - x64 or x86 architecture, defaults to x64.
         architecture: ${{ inputs.python-arch }}
 
-    - name: Setup scons
+    - name: Setup SCons
       shell: bash
       run: |
         python -c "import sys; print(sys.version)"
-        python -m pip install scons==4.7.0
+        python -m pip install wheel
+        python -m pip install scons==${{ inputs.scons-version }}
         scons --version
diff --git a/.github/workflows/android_builds.yml b/.github/workflows/android_builds.yml
index 5cb66a40ab7c..9a488bd09561 100644
--- a/.github/workflows/android_builds.yml
+++ b/.github/workflows/android_builds.yml
@@ -32,7 +32,7 @@ jobs:
         uses: ./.github/actions/godot-cache
         continue-on-error: true
 
-      - name: Setup python and scons
+      - name: Setup Python and SCons
         uses: ./.github/actions/godot-deps
 
       - name: Compilation (arm32)
diff --git a/.github/workflows/godot_cpp_test.yml b/.github/workflows/godot_cpp_test.yml
index 7350920810d7..57114dacfc20 100644
--- a/.github/workflows/godot_cpp_test.yml
+++ b/.github/workflows/godot_cpp_test.yml
@@ -22,7 +22,7 @@ jobs:
         with:
           submodules: recursive
 
-      - name: Setup python and scons
+      - name: Setup Python and SCons
         uses: ./.github/actions/godot-deps
 
       # Checkout godot-cpp
@@ -47,7 +47,7 @@ jobs:
           cp -f godot-api/gdextension_interface.h godot-cpp/gdextension/
           cp -f godot-api/extension_api.json godot-cpp/gdextension/
 
-      # TODO: Add caching to the scons build and store it for CI via the godot-cache
+      # TODO: Add caching to the SCons build and store it for CI via the godot-cache
       # action.
 
       # Build godot-cpp test extension
diff --git a/.github/workflows/ios_builds.yml b/.github/workflows/ios_builds.yml
index e205d551ed96..0546f43acc5c 100644
--- a/.github/workflows/ios_builds.yml
+++ b/.github/workflows/ios_builds.yml
@@ -26,7 +26,7 @@ jobs:
         uses: ./.github/actions/godot-cache
         continue-on-error: true
 
-      - name: Setup python and scons
+      - name: Setup Python and SCons
         uses: ./.github/actions/godot-deps
 
       - name: Compilation (arm64)
diff --git a/.github/workflows/linux_builds.yml b/.github/workflows/linux_builds.yml
index 0420a02b1dd9..6b98256110f9 100644
--- a/.github/workflows/linux_builds.yml
+++ b/.github/workflows/linux_builds.yml
@@ -58,6 +58,8 @@ jobs:
             tests: true
             # Skip 2GiB artifact speeding up action.
             artifact: false
+            # Test our oldest supported SCons/Python versions on one arbitrary editor build.
+            legacy-scons: true
 
           - name: Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)
             cache-name: linux-editor-thread-sanitizer
@@ -115,9 +117,18 @@ jobs:
           cache-name: ${{ matrix.cache-name }}
         continue-on-error: true
 
-      - name: Setup python and scons
+      - name: Setup Python and SCons
+        if: ${{ ! matrix.legacy-scons }}
         uses: ./.github/actions/godot-deps
 
+      - name: Setup Python and SCons (legacy versions)
+        if: ${{ matrix.legacy-scons }}
+        uses: ./.github/actions/godot-deps
+        with:
+          # Sync with Ensure*Version in SConstruct.
+          python-version: 3.6
+          scons-version: 3.1.2
+
       - name: Setup GCC problem matcher
         uses: ammaraskar/gcc-problem-matcher@master
 
diff --git a/.github/workflows/macos_builds.yml b/.github/workflows/macos_builds.yml
index 70031ec4c341..badcb688d1bc 100644
--- a/.github/workflows/macos_builds.yml
+++ b/.github/workflows/macos_builds.yml
@@ -43,7 +43,7 @@ jobs:
           cache-name: ${{ matrix.cache-name }}
         continue-on-error: true
 
-      - name: Setup python and scons
+      - name: Setup Python and SCons
         uses: ./.github/actions/godot-deps
 
       - name: Setup Vulkan SDK
diff --git a/.github/workflows/web_builds.yml b/.github/workflows/web_builds.yml
index cfa1571d1f65..1eb7b901cd6a 100644
--- a/.github/workflows/web_builds.yml
+++ b/.github/workflows/web_builds.yml
@@ -58,7 +58,7 @@ jobs:
           cache-name: ${{ matrix.cache-name }}
         continue-on-error: true
 
-      - name: Setup python and scons
+      - name: Setup Python and SCons
         uses: ./.github/actions/godot-deps
 
       - name: Compilation
diff --git a/.github/workflows/windows_builds.yml b/.github/workflows/windows_builds.yml
index 5443ba20ab5c..f9513af5e3b4 100644
--- a/.github/workflows/windows_builds.yml
+++ b/.github/workflows/windows_builds.yml
@@ -48,7 +48,7 @@ jobs:
           cache-name: ${{ matrix.cache-name }}
         continue-on-error: true
 
-      - name: Setup python and scons
+      - name: Setup Python and SCons
         uses: ./.github/actions/godot-deps
 
       - name: Download Direct3D 12 SDK components
diff --git a/SConstruct b/SConstruct
index c062f95bdba8..c668ac7df343 100644
--- a/SConstruct
+++ b/SConstruct
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-EnsureSConsVersion(3, 0, 0)
+EnsureSConsVersion(3, 1, 2)
 EnsurePythonVersion(3, 6)
 
 # System