diff --git a/.github/workflows/bump-go-toolchain.yml b/.github/workflows/bump-go-toolchain.yml
index 1954312bdda..e91c7f37ec7 100644
--- a/.github/workflows/bump-go-toolchain.yml
+++ b/.github/workflows/bump-go-toolchain.yml
@@ -92,6 +92,7 @@ jobs:
         run: git diff
 
       - name: Create pull request
+        id: cpr
         if: steps.check.outputs.needed == 'true' && inputs.version == ''
         uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
         with:
@@ -104,3 +105,23 @@ jobs:
             Release notes: https://go.dev/doc/devel/release#${{ steps.latest.outputs.toolchain }}
           reviewers: simonfaltum,andrewnester,anton-107,denik,janniklasrose,pietern,shreyas-goenka
           labels: dependencies
+
+      # Add the changelog fragment as a follow-up commit on the PR branch: the
+      # fragment references the PR number, which only exists once the PR above
+      # has been created.
+      - name: Add changelog fragment
+        if: steps.cpr.outputs.pull-request-number
+        env:
+          TOOLCHAIN: ${{ steps.latest.outputs.toolchain }}
+          BRANCH: ${{ steps.cpr.outputs.pull-request-branch }}
+          PR: ${{ steps.cpr.outputs.pull-request-number }}
+        run: |-
+          git fetch origin "$BRANCH"
+          git checkout -f -B "$BRANCH" FETCH_HEAD
+          fragment=".nextchanges/dependency-updates/go-toolchain-${TOOLCHAIN}.md"
+          echo "Bump Go toolchain to ${TOOLCHAIN#go} ([#${PR}](https://github.com/databricks/cli/pull/${PR}))." > "$fragment"
+          git add "$fragment"
+          git -c user.name='github-actions[bot]' \
+              -c user.email='41898282+github-actions[bot]@users.noreply.github.com' \
+              commit -m "Add changelog fragment"
+          git push origin "HEAD:$BRANCH"
diff --git a/.nextchanges/dependency-updates/go-toolchain-go1.26.6.md b/.nextchanges/dependency-updates/go-toolchain-go1.26.6.md
new file mode 100644
index 00000000000..d45478bc8d5
--- /dev/null
+++ b/.nextchanges/dependency-updates/go-toolchain-go1.26.6.md
@@ -0,0 +1 @@
+Bump Go toolchain to 1.26.6 ([#6266](https://github.com/databricks/cli/pull/6266)).