diff --git a/Dockerfile.temp b/Dockerfile.temp
index bccb9ad..68bc8e4 100644
--- a/Dockerfile.temp
+++ b/Dockerfile.temp
@@ -1,6 +1,7 @@
-FROM python:3.5-stretch
+FROM python:3.5-alpine
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
+RUN apk add build-base libc-dev gcc python3-dev jpeg-dev zlib-dev
 RUN chown -R root:root /usr/local/lib/python*
 RUN pip3 install --no-cache --pre Django==2.2 pillow
 COPY djenerator/ /tmp/djenerator
diff --git a/README.md b/README.md
index 6c230eb..d8200ab 100644
--- a/README.md
+++ b/README.md
@@ -117,6 +117,10 @@ The following combinations are tested:
 |    2.2.28   |     3.7     |   ✅   |
 |    3.2.15   |     3.6     |   ✅   |
 |    3.2.15   |     3.7     |   ✅   |
+|    4.0.7    |     3.8     |   ✅   |
+|    4.0.7    |     3.9     |   ✅   |
+|    4.1.1    |     3.8     |   ✅   |
+|    4.1.1    |     3.9     |   ✅   |
 
 ## Requirements
 
diff --git a/djenerator/core/utils.py b/djenerator/core/utils.py
index bb12568..2e34c21 100644
--- a/djenerator/core/utils.py
+++ b/djenerator/core/utils.py
@@ -258,6 +258,10 @@ def get_timezone(tz: str):
     try:
         import zoneinfo
         return zoneinfo.ZoneInfo(tz)
-    except Exception:
-        import pytz
-        return pytz.timezone(tz)
+    except ImportError:
+        try:
+            from backports import zoneinfo
+            return zoneinfo.ZoneInfo(tz)
+        except Exception:
+            import pytz
+            return pytz.timezone(tz)
diff --git a/test-all-versions b/test-all-versions
index f08b904..3e38fe5 100755
--- a/test-all-versions
+++ b/test-all-versions
@@ -17,4 +17,12 @@ cat Dockerfile.temp | sed "s/3.5/3.6/" | sed "s/2.2/3.2.15/"  > Dockerfile && ma
 head -n 1 Dockerfile && head -n 5 Dockerfile | tail -n 1 && echo -e "\n\n"
 cat Dockerfile.temp | sed "s/3.5/3.7/" | sed "s/2.2/3.2.15/"  > Dockerfile && make docker-test
 head -n 1 Dockerfile && head -n 5 Dockerfile | tail -n 1 && echo -e "\n\n"
+cat Dockerfile.temp | sed "s/3.5/3.8/" | sed "s/2.2/4.0.7/"  > Dockerfile && make docker-test
+head -n 1 Dockerfile && head -n 5 Dockerfile | tail -n 1 && echo -e "\n\n"
+cat Dockerfile.temp | sed "s/3.5/3.8/" | sed "s/2.2/4.1.1/"  > Dockerfile && make docker-test
+head -n 1 Dockerfile && head -n 5 Dockerfile | tail -n 1 && echo -e "\n\n"
+cat Dockerfile.temp | sed "s/3.5/3.9/" | sed "s/2.2/4.0.7/"  > Dockerfile && make docker-test
+head -n 1 Dockerfile && head -n 5 Dockerfile | tail -n 1 && echo -e "\n\n"
+cat Dockerfile.temp | sed "s/3.5/3.9/" | sed "s/2.2/4.1.1/"  > Dockerfile && make docker-test
+head -n 1 Dockerfile && head -n 5 Dockerfile | tail -n 1 && echo -e "\n\n"
 rm Dockerfile