diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 88fa837f..fe2596e4 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -21,3 +21,12 @@
 <!--
   Describe how the change was tested end-to-end.
 -->
+
+### ☑️ Checks
+
+<!--
+  Some sanity checks to make sure your PR is good to go. Make sure all checkboxes
+  are ticked!
+-->
+
+- [ ] My PR contains actual code changes, and I have updated the version number in `pyproject.toml`.
diff --git a/.github/scripts/check_version.sh b/.github/scripts/check_version.sh
new file mode 100755
index 00000000..54c90238
--- /dev/null
+++ b/.github/scripts/check_version.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+if git diff --name-only origin/main | grep ".*\.py$" > /dev/null 2>&1; then
+    # Found modified stuff, make sure version is bumped!
+    MAIN_TAG=$(git describe origin/main --tags --abbrev=0)
+    CURRENT_VERSION=$(poetry version --short 2>/dev/null)
+
+    GIT_ROOT=$(git rev-parse --show-toplevel)
+    # Script exits with return code 1 if the check fails.
+    python ${GIT_ROOT}/.github/scripts/compare_versions.py ${MAIN_TAG} ${CURRENT_VERSION}
+fi
\ No newline at end of file
diff --git a/.github/scripts/compare_versions.py b/.github/scripts/compare_versions.py
new file mode 100644
index 00000000..d1fdbfa7
--- /dev/null
+++ b/.github/scripts/compare_versions.py
@@ -0,0 +1,13 @@
+# This script checks if current version is larger than latest main version.
+
+import sys
+
+from packaging import version
+
+main_tag = sys.argv[1]
+current_version = sys.argv[2]
+
+# We want this program to exit 1 when the check fails.
+# Since `True` == `1`, we want this comparison to evaluate to `0` if we
+# want the check to pass.
+sys.exit(version.parse(main_tag) >= version.parse(current_version))
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dbcf0762..55284cca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,6 +62,9 @@ jobs:
           thresholdNew: 0.85
           thresholdModified: 0.0
 
+      - name: Check bumped version
+        run: bash .github/scripts/check_version.sh
+
   docker:
     name: Docker build
     runs-on: ubuntu-latest