diff --git a/charmcraft.yaml b/charmcraft.yaml
index 14fd402..a40a8a9 100644
--- a/charmcraft.yaml
+++ b/charmcraft.yaml
@@ -3,12 +3,6 @@ parts:
   charm:
     source: src
     plugin: reactive
-    build-snaps:
-      # temporary fix because charm cannot install/build on 20.04 using
-      # charm/3.x without unnecessary dependency in wheelhouse.txt:
-      # Jinja2<3;python_version == '3.8'
-      # setuptools~=46.0.0;python_version == '3.8'
-      - charm/2.x/stable
 bases:
     - build-on:
         - name: ubuntu
diff --git a/src/metadata.yaml b/src/metadata.yaml
index f419771..425f00d 100644
--- a/src/metadata.yaml
+++ b/src/metadata.yaml
@@ -14,7 +14,6 @@ tags:
   # https://jujucharms.com/docs/stable/authors-charm-metadata
   - backup
 subordinate: true
-series: []
 provides:
   nrpe-external-master:
     interface: nrpe-external-master
diff --git a/src/requirements.txt b/src/requirements.txt
index 47e3c05..5d35e6e 100644
--- a/src/requirements.txt
+++ b/src/requirements.txt
@@ -2,3 +2,7 @@
 croniter
 pidfile
 fabric
+# NOTE(rgildein): The contextvars could not be installed without this requirement to be specified.
+setuptools>=42
+# NOTE(rgildein): The typing-extensions could not be installed without this requirement to be specified.
+flit-core>=3
diff --git a/src/wheelhouse.txt b/src/wheelhouse.txt
index e7a5072..c411668 100644
--- a/src/wheelhouse.txt
+++ b/src/wheelhouse.txt
@@ -1,3 +1,7 @@
 distro<1.7.0
 croniter
 pidfile
+# NOTE(rgildein): The contextvars could not be installed without this requirement to be specified.
+setuptools>=42
+# NOTE(rgildein): The typing-extensions could not be installed without this requirement to be specified.
+flit-core>=3