diff --git a/pkgs/development/python-modules/acme/default.nix b/pkgs/development/python-modules/acme/default.nix
index 538b8dff964a..65e930e07414 100644
--- a/pkgs/development/python-modules/acme/default.nix
+++ b/pkgs/development/python-modules/acme/default.nix
@@ -3,7 +3,7 @@
 , cryptography
 , pyasn1
 , pyopenssl
-, pyRFC3339
+, pyrfc3339
 , josepy
 , pytz
 , requests
@@ -20,7 +20,7 @@ buildPythonPackage rec {
   format = "setuptools";
 
   propagatedBuildInputs = [
-    cryptography pyasn1 pyopenssl pyRFC3339 pytz requests requests-toolbelt six
+    cryptography pyasn1 pyopenssl pyrfc3339 pytz requests requests-toolbelt six
     werkzeug ndg-httpsclient josepy
   ];
 
diff --git a/pkgs/development/python-modules/certbot/default.nix b/pkgs/development/python-modules/certbot/default.nix
index 621a0f991856..0689319840e6 100644
--- a/pkgs/development/python-modules/certbot/default.nix
+++ b/pkgs/development/python-modules/certbot/default.nix
@@ -10,7 +10,7 @@
 , distro
 , josepy
 , parsedatetime
-, pyRFC3339
+, pyrfc3339
 , pyopenssl
 , pytz
 , requests
@@ -47,7 +47,7 @@ buildPythonPackage rec {
     distro
     josepy
     parsedatetime
-    pyRFC3339
+    pyrfc3339
     pyopenssl
     pytz
     requests
diff --git a/pkgs/development/python-modules/pyrfc3339/default.nix b/pkgs/development/python-modules/pyrfc3339/default.nix
index 9345b819f75c..368f3cda24de 100644
--- a/pkgs/development/python-modules/pyrfc3339/default.nix
+++ b/pkgs/development/python-modules/pyrfc3339/default.nix
@@ -14,12 +14,13 @@
 }:
 
 buildPythonPackage rec {
-  pname = "pyRFC3339";
+  pname = "pyrfc3339";
   version = "1.1";
   pyproject = true;
 
   src = fetchPypi {
-    inherit pname version;
+    pname = "pyRFC3339";
+    inherit version;
     sha256 = "06jv7ar7lpvvk0dixzwdr3wgm0g1lipxs429s2z7knwwa7hwpf41";
   };
 
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index da8ea5e389b7..dd65048e28f5 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -345,6 +345,7 @@ mapAliases ({
   pyramid_multiauth = pyramid-multiauth; # added 2023-08-24
   pyreadability = readability-lxml; # added 2022-05-24
   pyres = throw "pyres has been removed, since it is abandoned and broken"; # added 2023-06-20
+  pyRFC3339 = pyrfc3339; # added 2024-01-07
   pyroute2-core = throw "pyroute2 migrated back to a single package scheme in version 0.7.1"; # added 2022-07-16
   pyroute2-ethtool = throw "pyroute2 migrated back to a single package scheme in version 0.7.1"; # added 2022-07-16
   pyroute2-ipdb = throw "pyroute2 migrated back to a single package scheme in version 0.7.1"; # added 2022-07-16
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 3474f3b6c829..c440f07570bd 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -11107,7 +11107,7 @@ self: super: with self; {
 
   pyrituals = callPackage ../development/python-modules/pyrituals { };
 
-  pyRFC3339 = callPackage ../development/python-modules/pyrfc3339 { };
+  pyrfc3339 = callPackage ../development/python-modules/pyrfc3339 { };
 
   pyrmvtransport = callPackage ../development/python-modules/pyrmvtransport { };