diff --git a/.github/workflows/build-and-push.yml b/.github/workflows/build-and-push.yml
index bdfd04d..b34213e 100644
--- a/.github/workflows/build-and-push.yml
+++ b/.github/workflows/build-and-push.yml
@@ -20,7 +20,7 @@ jobs:
         with:
           dockerfiles: ./Dockerfile.generator
           image: cwt-generator
-          tags: latest 1 ${{ github.sha }}
+          tags: latest 1 ${{ github.sha }} 1.5.7
 
       - name: Push cwt-generator image to Quay.io
         id: push-to-quay
diff --git a/Dockerfile.generator b/Dockerfile.generator
index c221201..33fc8d9 100644
--- a/Dockerfile.generator
+++ b/Dockerfile.generator
@@ -1,4 +1,4 @@
-FROM quay.io/fedora/fedora:36
+FROM quay.io/fedora/fedora:39
 ENV CWT_DIR=/tmp/container-workflow-tool
 RUN dnf install -y go-md2man \
     make git python3-PyYAML \
diff --git a/Dockerfile.tests b/Dockerfile.tests
index f601cbd..ab71276 100644
--- a/Dockerfile.tests
+++ b/Dockerfile.tests
@@ -1,4 +1,4 @@
-FROM quay.io/fedora/fedora:36
+FROM quay.io/fedora/fedora:39
 
 RUN dnf install -y ansible
 
diff --git a/Makefile b/Makefile
index 08abca0..ecb1a0f 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ TEST_IMAGE=cwt-tests
 GENERATOR_IMAGE=quay.io/rhscl/cwt-generator
 UNAME=$(shell uname)
 ifeq ($(UNAME),Darwin)
-	PODMAN := /usr/local/bin/docker
+	PODMAN := /opt/podman/bin/podman
 else
 	PODMAN := /usr/bin/podman
 endif
diff --git a/container_workflow_tool/distgit.py b/container_workflow_tool/distgit.py
index 66afbe5..6334806 100644
--- a/container_workflow_tool/distgit.py
+++ b/container_workflow_tool/distgit.py
@@ -74,13 +74,7 @@ def dist_git_merge_changes(self, images, rebase=False):
                 pull_upstr = image.get("pull_upstream", True)
                 repo = self._clone_downstream(component, branch)
                 df_path = os.path.join(component, "Dockerfile")
-                downstream_from = self.df_handler.get_from_df(df_path)
-                self.logger.debug(f"Downstream_from: {downstream_from}\n")
-                from_tag = self.conf.get("from_tag", "latest")
                 if rebase or not pull_upstr:
-                    self.df_handler.update_dockerfile(
-                        df_path, from_tag, downstream_from=downstream_from
-                    )
                     # It is possible for the git repository to have no changes
                     if repo.is_dirty():
                         commit = self.get_commit_msg(rebase, image)
@@ -97,9 +91,6 @@ def dist_git_merge_changes(self, images, rebase=False):
                     # Save the upstream commit hash
                     ups_hash = Repo(ups_path).commit().hexsha
                     self.pull_upstream(component, path, url, repo, ups_name, commands)
-                    self.df_handler.update_dockerfile(
-                        df_path, from_tag, downstream_from=downstream_from
-                    )
                     repo.git.add("Dockerfile")
                     # It is possible for the git repository to have no changes
                     if repo.is_dirty():
diff --git a/container_workflow_tool/main.py b/container_workflow_tool/main.py
index 3830a54..cb8661c 100755
--- a/container_workflow_tool/main.py
+++ b/container_workflow_tool/main.py
@@ -425,7 +425,8 @@ def clear_cache(self):
         self.logger.info("Removing cached data and git storage.")
         # Clear ondisk storage for git and the brew cache
         tmp = self._get_tmp_workdir(setup_dir=False)
-        shutil.rmtree(tmp, ignore_errors=True)
+        if tmp is not None and os.path.isdir(tmp):
+            shutil.rmtree(tmp, ignore_errors=True)
         # If the working directory has been set by the user, recreate it
         if self.tmp_workdir:
             os.makedirs(tmp)
diff --git a/setup.py b/setup.py
index d267067..f9227e0 100755
--- a/setup.py
+++ b/setup.py
@@ -58,7 +58,7 @@ def get_dir(system_path=None, virtual_path=None):
 
 setup(
     name='container-workflow-tool',
-    version="1.5.6",
+    version="1.5.7",
     description='A python3 tool to make rebuilding images easier by automating several steps of the process.',
     long_description=long_description,
     long_description_content_type='text/markdown',
diff --git a/tests/test_distgit.py b/tests/test_distgit.py
index 38e548e..089f35e 100644
--- a/tests/test_distgit.py
+++ b/tests/test_distgit.py
@@ -66,14 +66,7 @@ def test_distgit_merge_changes(self):
         self.ir.conf["from_tag"] = "test"
         tmp = Path(self.ir._get_tmp_workdir())
         self.ir.dist_git_merge_changes()
-        dpath = tmp / self.component / 'Dockerfile'
-        assert os.path.isfile(dpath)
         assert not (tmp / self.component / "test" / "test-openshift.yaml").exists()
-        tag_found = False
-        with open(dpath) as f:
-            if ":test" in f.read():
-                tag_found = True
-        assert tag_found
         shutil.rmtree(tmp / self.component)
 
     @pytest.mark.distgit
@@ -86,25 +79,4 @@ def test_distgit_merge_changes_openshift_yaml(self):
         tmp = Path(self.ir._get_tmp_workdir())
         self.ir.distgit._clone_downstream(self.component, "main")
         self.ir.dist_git_merge_changes()
-        dpath = tmp / self.component / 'Dockerfile'
-        assert os.path.isfile(dpath)
-        tag_found = False
-        with open(dpath) as f:
-            if ":test" in f.read():
-                tag_found = True
-        assert tag_found
-        shutil.rmtree(tmp / self.component)
-
-    @pytest.mark.distgit
-    def test_tag_dockerfile(self):
-        tmp = Path(self.ir._get_tmp_workdir())
-        self.ir.conf["from_tag"] = "test"
-        self.ir.dist_git_merge_changes()
-        cpath = tmp / self.component
-        dpath = cpath / 'Dockerfile'
-        found_tag = False
-        with open(dpath) as f:
-            if ":test" in f.read():
-                found_tag = True
-        assert found_tag
         shutil.rmtree(tmp / self.component)