diff --git a/notifications_utils/polygons.py b/notifications_utils/polygons.py
index 0f7b65eea..ae2579fe6 100644
--- a/notifications_utils/polygons.py
+++ b/notifications_utils/polygons.py
@@ -24,11 +24,11 @@
         # earth because the earth is not a perfect sphere.
         # —
         # The UK, west to east
-        "epsg:32629",  # Zone 29N: Between 12°W and 6°W, equator and 84°N
-        "epsg:32630",  # Zone 30N: Between 6°W and 0°W, equator and 84°N
-        "epsg:32631",  # Zone 31N: Between 0°E and 6°E, equator and 84°N
+        "EPSG:32629",  # Zone 29N: Between 12°W and 6°W, equator and 84°N
+        "EPSG:32630",  # Zone 30N: Between 6°W and 0°W, equator and 84°N
+        "EPSG:32631",  # Zone 31N: Between 0°E and 6°E, equator and 84°N
         # Santa Claus village (Finland)
-        "epsg:32635",  # Zone 35N: Between 24°E and 30°E, equator and 84°N
+        "EPSG:32635",  # Zone 35N: Between 24°E and 30°E, equator and 84°N
     }
 }
 
diff --git a/setup.py b/setup.py
index 97a0c40da..957dede82 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@
         "Flask-Redis>=0.4.0",
         "pyyaml>=5.3.1",
         "phonenumbers>=8.12.13",
-        "pyproj>=3.2.1",
+        "pyproj>=3.4.1",
         "pytz>=2020.4",
         "smartypants>=2.0.1",
         "pypdf2>=2.0.0",
diff --git a/tests/test_polygons.py b/tests/test_polygons.py
index 51b58e0d5..77e3a9101 100644
--- a/tests/test_polygons.py
+++ b/tests/test_polygons.py
@@ -407,7 +407,7 @@ def test_precision():
 
 def test_passes_through_coordinates_without_converting_to_crs():
     without_crs = Polygons([HACKNEY_MARSHES])
-    with_crs = Polygons([HACKNEY_MARSHES], utm_crs="epsg:32630")
+    with_crs = Polygons([HACKNEY_MARSHES], utm_crs="EPSG:32630")
 
     assert without_crs.as_coordinate_pairs_lat_long == with_crs.as_coordinate_pairs_lat_long