diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 94cff15b..d29141af 100755
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -68,6 +68,17 @@ jobs:
           ghc --version
           stack --version
           stack test --system-ghc $extraLibDirs $extraIncludeDirsLLVM $extraIncludeDirsFFI --fast --no-terminal --snapshot=lts-$snapshot
+      - name: Check for Source Changes
+        shell: bash
+        run: |
+          if [ -n "$(git status --porcelain)" ]
+          then
+            >&2 echo 'ERROR: Source Changed After Build'
+            >&2 git diff
+            >&2 git status
+            >&2 echo 'ERROR: Source Changed After Build'
+            exit 1
+          fi
 
   Cabal:
     name: Cabal
diff --git a/classy-prelude/classy-prelude.cabal b/classy-prelude/classy-prelude.cabal
index b727fe49..38ef0d36 100644
--- a/classy-prelude/classy-prelude.cabal
+++ b/classy-prelude/classy-prelude.cabal
@@ -5,7 +5,7 @@ cabal-version: 1.12
 -- see: https://github.com/sol/hpack
 
 name:           classy-prelude
-version:        1.5.0.2
+version:        1.5.0.3
 synopsis:       A typeclass-based Prelude.
 description:    See docs and README at <http://www.stackage.org/package/classy-prelude>
 category:       Control, Prelude