diff --git a/dbt/common/ui.py b/dbt/common/ui.py
index 80eeb6c6..1056df2e 100644
--- a/dbt/common/ui.py
+++ b/dbt/common/ui.py
@@ -1,3 +1,4 @@
+import os
 import sys
 import textwrap
 from typing import Dict
diff --git a/pyproject.toml b/pyproject.toml
index f641b275..74e760a0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,14 +21,21 @@ classifiers = [
 ]
 dependencies = [
   "agate~=1.7.0",
-  "colorama>=0.3.9,<0.5",  # TODO: major version 0 - should we use it?
+  "colorama>=0.3.9,<0.5",
+  "isodate>=0.6,<0.7",
   "jsonschema~=4.0",
   "Jinja2~=3.0",
   "mashumaro[msgpack]~=3.9",
+  "pathspec>=0.9,<0.12", # TODO: I'm not sure this is needed.  check search.py?
   "protobuf>=4.0.0",
   "python-dateutil~=2.0",
   "requests<3.0.0",
   "typing-extensions~=4.4",
+   # Match snowflake-connector-python, to ensure compatibility in dbt-snowflake
+  "cffi>=1.9,<2.0.0",
+  "idna>=2.5,<4",
+  "requests<3.0.0",
+  "urllib3~=1.0", # we pin urllib3 ~= 1.0 because of openssl requirement for requests
 ]
 
 [build-system]
diff --git a/third-party-stubs/colorama/__init__.py b/third-party-stubs/colorama/__init__.py
new file mode 100644
index 00000000..4502880e
--- /dev/null
+++ b/third-party-stubs/colorama/__init__.py
@@ -0,0 +1,16 @@
+from typing import Optional, Any
+
+class Fore:
+    RED: str = ...
+    GREEN: str = ...
+    YELLOW: str = ...
+
+class Style:
+    RESET_ALL: str = ...
+
+def init(
+    autoreset: bool = ...,
+    convert: Optional[Any] = ...,
+    strip: Optional[Any] = ...,
+    wrap: bool = ...,
+) -> None: ...