diff --git a/dbt-core/default.nix b/dbt-core/default.nix
index 4db1fc7..fbfeed4 100644
--- a/dbt-core/default.nix
+++ b/dbt-core/default.nix
@@ -4,17 +4,105 @@ with import (builtins.fetchTarball {
     sha256 = "18dij8g8p71a3ymr58bjn9j7bl9d3hkmzfccc0bqk5fi887i4z7z";
 }) {
     overlays = [
-        # Overlay our SQLParse to be the correct version.
-        (prev: final: {
-            sqlparse = prev.sqlparse.overrideAttrPythonAttrs (oldAttrs: rec {
-                version = "0.2.3";
-                pname = oldAttrs.pname;
-                src = prev.fetchPypi {
-                    inherit pname;
-                    inherit version;
-                    sha256 = "0000000000000000000000000000000000000000000000000000";
-                };
-            });
+        # Overlay our packages to the correct versions.
+        # TODO my naming here is wrong and therefore confusing
+        (self: super: {
+            python39 = super.python39.override {
+                packageOverrides =  (pyself: pysuper: {
+                    sqlparse = pysuper.sqlparse.overrideAttrs (oldAttrs: rec {
+                        version = "0.2.3";
+                        pname = oldAttrs.pname;
+                        src = pyself.fetchPypi {
+                            inherit pname;
+                            inherit version;
+                            sha256 = "1y7gpqjk15ccgya032214iq2j0r4pprgrvffx0fk3pxvrv3prkdy";
+                        };
+                    });
+                    colorama = pysuper.colorama.overrideAttrs (oldAttrs: rec {
+                        version = "0.3.9";
+                        pname = oldAttrs.pname;
+                        src = pyself.fetchPypi {
+                            inherit pname;
+                            inherit version;
+                            sha256 = "1wd1szk0z3073ghx26ynw43gnc140ibln1safgsis6s6z3s25ss8";
+                        };
+                    });
+                    jsonschema = pysuper.jsonschema.overrideAttrs (oldAttrs: rec {
+                        version = "2.6.0";
+                        pname = oldAttrs.pname;
+                        src = pyself.fetchPypi {
+                            inherit pname;
+                            inherit version;
+                            sha256 = "00kf3zmpp9ya4sydffpifn0j0mzm342a2vzh82p6r0vh10cg7xbg";
+                        };
+                    });
+                    boto3 = pysuper.boto3.overrideAttrs (oldAttrs: rec {
+                        version = "1.6.23";
+                        pname = oldAttrs.pname;
+                        src = pyself.fetchPypi {
+                            inherit pname;
+                            inherit version;
+                            sha256 = "0r28nv8wfrqc0wgacpv939wvw1cqp99wlskwg6nzx3b29d1j6gsj";
+                        };
+                    });
+                    botocore = pysuper.botocore.overrideAttrs (oldAttrs: rec {
+                        version = "1.9.23";
+                        pname = oldAttrs.pname;
+                        src = pyself.fetchPypi {
+                            inherit pname;
+                            inherit version;
+                            sha256 = "147sxvx8gsh2fajxx5rm1r07zvlbhwj42dckkbs5wf3s9j21500m";
+                        };
+                    });
+                    python-dateutil = pysuper.python-dateutil.overrideAttrs (oldAttrs: rec {
+                        version = "2.1";
+                        pname = oldAttrs.pname;
+                        src = pyself.fetchPypi {
+                            inherit pname;
+                            inherit version;
+                            sha256 = "1vlx0lpsxjxz64pz87csx800cwfqznjyr2y7nk3vhmzhkwzyqi2c";
+                        };
+                        pythonImportsCheck = [ ];
+                    });
+                    #networkx = pysuper.networkx.overrideAttrs (oldAttrs: rec {
+                    #    version = "1.11";
+                    #    pname = oldAttrs.pname;
+                    #    src = pyself.fetchPypi {
+                    #        inherit pname;
+                    #        inherit version;
+                    #        sha256 = "1f74s56xb4ggixiq0vxyfxsfk8p20c7a099lpcf60izv1php03hd";
+                    #    };
+                    #});
+                    certifi = pyself.buildPythonPackage rec {
+                        version = "2020.6.20";
+                        pname = "certifi";
+                        src = pyself.fetchPypi {
+                            inherit pname;
+                            inherit version;
+                            sha256 = "1lrlxvcaab3kyr5j08dgvw5cvhpij38dldfwp0dx4va92xc5jc2r";
+                        };
+
+                        pythonImportsCheck = [ "certifi" ];
+                        
+                        doCheck = false;
+
+                        meta = with self.lib; {
+                          homepage = "https://certifi.io/";
+                          description = "Python package for providing Mozilla's CA Bundle";
+                          license = licenses.isc;
+                        };
+                    };
+                    snowflake-connector-python = pysuper.snowflake-connector-python.overrideAttrs (oldAttrs: rec {
+                        version = "2.4.1";
+                        pname = oldAttrs.pname;
+                        src = pyself.fetchPypi {
+                            inherit pname;
+                            inherit version;
+                            sha256 = "1bms4z3zjxzzg0m9smgf0h5cm49h8a41c8w3vyqvx9q22bk814aw";
+                        };
+                    });
+                });
+            };
         })
     ];
 };
@@ -25,16 +113,13 @@ buildPythonPackage rec {
     version = "0.12.0";
     
     propagatedBuildInputs = [
-        agate
         attrs
         Babel
+        agate
         certifi
         cffi
-        #charset-normalizer
         click
         colorama
-        #dbt-extractor
-        #dbt-postgres
         hologram
         idna
         importlib-metadata
@@ -44,8 +129,6 @@ buildPythonPackage rec {
         leather
         Logbook
         markupsafe
-        #mashumaro
-        #minimal-snowplow-tracker
         msgpack
         networkx
         packaging
@@ -61,14 +144,18 @@ buildPythonPackage rec {
         pyyaml
         requests
         six
-        # TODO(jwall): We need to override sqlparse here to be exactly version 0.2.3
         sqlparse
         text-unidecode
         typing-extensions
         urllib3
         werkzeug
         zipp
-        #snowflake-connector-python
+        snowflake-connector-python
+        #charset-normalizer
+        #mashumaro
+        #minimal-snowplow-tracker
+        #dbt-extractor
+        #dbt-postgres
     ];
     
     doCheck = false;
diff --git a/shell.nix b/shell.nix
index db9fb12..dac9a84 100644
--- a/shell.nix
+++ b/shell.nix
@@ -8,10 +8,10 @@ stdenv.mkDerivation {
     git
 
     # Python requirements (enough to get a virtualenv going).
-    python38Full
-    python38Packages.virtualenv
-    python38Packages.pip
-    python38Packages.setuptools
+    python39Full
+    python39Packages.virtualenv
+    python39Packages.pip
+    python39Packages.setuptools
   ];
   src = null;
   shellHook = ''