diff --git a/.travis.yml b/.travis.yml
index 78475f0d6..0068e208a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ sudo: required
 services:
 - docker
 python:
+- '3.5'
 - '3.6'
 install:
 - pip install sphinx mypy
diff --git a/bugzoo/core/fileline.py b/bugzoo/core/fileline.py
index ae0726fe4..90abe8bfd 100644
--- a/bugzoo/core/fileline.py
+++ b/bugzoo/core/fileline.py
@@ -15,7 +15,7 @@ def compactify(d: Dict['FileLine', Any]) -> Dict[str, Dict[int, Any]]:
         assert isinstance(d, dict)
         assert all(isinstance(x, FileLine) for x in d)
 
-        out: Dict[str, Dict[int, Any]] = {}
+        out = {} # type: Dict[str, Dict[int, Any]]
         for (line, val) in d.items():
             if not line.filename in out:
                 out[line.filename] = {}
@@ -24,7 +24,7 @@ def compactify(d: Dict['FileLine', Any]) -> Dict[str, Dict[int, Any]]:
 
     @staticmethod
     def decompactify(d: Dict[str, Dict[int, Any]]) -> 'Dict[FileLine, Any]':
-        lines: Dict['FileLine', Any] = {}
+        lines = {} # type: Dict['FileLine', Any]
         for fn in d:
             for num in d[fn]:
                 lines[FileLine(fn, num)] = d[fn][num]
@@ -82,7 +82,7 @@ def from_list(lst: List[FileLine]) -> 'FileLineSet':
 
     @staticmethod
     def from_iter(itr: Iterable[FileLine]) -> 'FileLineSet':
-        d: Dict[str, Set[int]] = {}
+        d = {} # type: Dict[str, Set[int]]
         for line in itr:
             if not line.filename in d:
                 d[line.filename] = set()
@@ -90,8 +90,8 @@ def from_iter(itr: Iterable[FileLine]) -> 'FileLineSet':
         return FileLineSet(d)
 
     def __init__(self, contents: Dict[str, Set[int]]) -> None:
-        self.__contents: Dict[str, FrozenSet[int]] = \
-            {fn: frozenset(line_nums) for (fn, line_nums) in contents.items()}
+        self.__contents = \
+            {fn: frozenset(line_nums) for (fn, line_nums) in contents.items()} # type: Dict[str, FrozenSet[int]]
 
     def __iter__(self) -> Iterator[FileLine]:
         """
@@ -172,7 +172,7 @@ def restricted_to_files(self, filenames: List[str]) -> 'FileLineSet':
         any one of the given files. (I.e., returns the intersection of this set
         and the set of all lines from a given set of files.)
         """
-        restricted: Dict[str, Set[int]] = {}
+        restricted = {} # type: Dict[str, Set[int]]
         for fn in filenames:
             restricted[fn] = set(self.__contents[fn])
         return FileLineSet(restricted)
diff --git a/bugzoo/core/patch.py b/bugzoo/core/patch.py
index d54c5b9ce..dcb30d5f8 100644
--- a/bugzoo/core/patch.py
+++ b/bugzoo/core/patch.py
@@ -79,7 +79,7 @@ def _read_next(cls, lines: List[str]) -> 'Hunk':
         last_insertion_at = old_start_at
 
 
-        hunk_lines: List[HunkLine] = []
+        hunk_lines = [] # type: List[HunkLine]
         while True:
             # discarding the previous line ensures that we only consume lines
             # from the line buffer that belong to the hunk
diff --git a/bugzoo/core/spectra.py b/bugzoo/core/spectra.py
index 9f2dadebd..3880b96bd 100644
--- a/bugzoo/core/spectra.py
+++ b/bugzoo/core/spectra.py
@@ -59,8 +59,8 @@ class Spectra(object):
     def from_coverage(coverage: TestSuiteCoverage) -> 'Spectra':
         # tally the number of times that each line is touched by a passing
         # or failing test
-        tally_failing: Dict[FileLine, int] = {}
-        tally_passing: Dict[FileLine, int] = {}
+        tally_failing = {} # type: Dict[FileLine, int]
+        tally_passing = {} # type: Dict[FileLine, int]
 
         for test in coverage.passing:
             for line in coverage[test].lines:
diff --git a/bugzoo/server/__init__.py b/bugzoo/server/__init__.py
index 2560d3a75..18253158e 100644
--- a/bugzoo/server/__init__.py
+++ b/bugzoo/server/__init__.py
@@ -4,7 +4,7 @@
 from bugzoo.server.daemon import Daemon
 from bugzoo.server.code import ErrorCode
 
-daemon: Daemon = None
+daemon = None # type: Daemon
 app = flask.Flask(__name__)
 
 
@@ -18,7 +18,7 @@ def list_bugs():
 
 @app.route('/bugs/<uid>', methods=['GET'])
 def show_bug(uid: str):
-    jsn: Dict[Any, Any] = {}
+    jsn = {} # type: Dict[Any, Any]
     try:
         bug = daemon.bugs[uid]
         jsn = bug.to_dict()
diff --git a/bugzoo/testing/base.py b/bugzoo/testing/base.py
index 5efc2e9f2..2b72befa9 100644
--- a/bugzoo/testing/base.py
+++ b/bugzoo/testing/base.py
@@ -113,8 +113,8 @@ def from_dict(yml: dict) -> 'TestSuite':
         raise Exception("unexpected test harness type: {}".format(typ))
 
     def __init__(self, tests: List[TestCase]) -> None:
-        self.__tests: Dict[str, TestCase] = \
-            {test.name: test for test in tests}
+        self.__tests = \
+            {test.name: test for test in tests} # type: Dict[str, TestCase]
 
     def __getitem__(self, name: str) -> TestCase:
         """
diff --git a/bugzoo/testing/simple.py b/bugzoo/testing/simple.py
index c93b9641a..a49d5e3c0 100644
--- a/bugzoo/testing/simple.py
+++ b/bugzoo/testing/simple.py
@@ -87,8 +87,8 @@ def __init__(self,
         super().__init__(command, context, time_limit, tests)
 
         # extract the passing and failing test cases
-        self.__passing: List[TestCase] = []
-        self.__failing: List[TestCase] = []
+        self.__passing = [] # type: List[TestCase]
+        self.__failing = [] # type: List[TestCase]
 
         for t in self.tests:
             if t.name.startswith('p'):
diff --git a/bugzoo/version.py b/bugzoo/version.py
index f593cd5bd..4c354e070 100644
--- a/bugzoo/version.py
+++ b/bugzoo/version.py
@@ -1 +1 @@
-__version__ = '2.0.4'
+__version__ = '2.0.5'