diff --git a/poetry.lock b/poetry.lock
index 44318b6..e07c482 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,3 +1,19 @@
+[[package]]
+category = "dev"
+description = "Version-bump your software with a single command!"
+name = "bump2version"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.5.11"
+
+[[package]]
+category = "dev"
+description = "Pythonic task execution"
+name = "invoke"
+optional = false
+python-versions = "*"
+version = "1.3.0"
+
 [[package]]
 category = "dev"
 description = "A Software Testing Tool"
@@ -7,8 +23,10 @@ python-versions = "*"
 version = "0.9.0"
 
 [metadata]
-content-hash = "50f47cfff0a332393b8edae898b2a7e4efd01d4f306246d32bb98c52e8701baa"
-python-versions = "^3.4"
+content-hash = "e60fb041589baae05d0cf0b4e08f198a39ce47b06cdbf3156ad8b144a778e6b9"
+python-versions = "^3.5"
 
 [metadata.hashes]
+bump2version = ["524bde030318fe2543038defe0f77739605636fef96924883813cb290cf79c1e", "bfcc051498dda9fd9ac8634689f4516e1c20fdeeace3278932cc6e1248418b36"]
+invoke = ["c52274d2e8a6d64ef0d61093e1983268ea1fc0cd13facb9448c4ef0c9a7ac7da", "f4ec8a134c0122ea042c8912529f87652445d9f4de590b353d23f95bfa1f0efd", "fc803a5c9052f15e63310aa81a43498d7c55542beb18564db88a9d75a176fa44"]
 lit = ["c035aa0a233633f7046745164a153a57d8bbcaf9b833232438cf4d2923d8786e"]
diff --git a/pyproject.toml b/pyproject.toml
index b0df73a..6c5401c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ description = "Python port of LLVM's FileCheck, flexible pattern matching file v
 authors = ["Stanislav Pankevich <s.pankevich@gmail.com>"]
 
 [tool.poetry.dependencies]
-python = "^3.4"
+python = "^3.5"
 
 [tool.poetry.dev-dependencies]
 lit = "^0.9"