diff --git a/poetry.lock b/poetry.lock
index 23b3373..be7855a 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.6.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
 [[package]]
 name = "astroid"
@@ -173,20 +173,6 @@ tomli = {version = "*", optional = true, markers = "python_full_version <= \"3.1
 [package.extras]
 toml = ["tomli"]
 
-[[package]]
-name = "dill"
-version = "0.3.6"
-description = "serialize all of python"
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "dill-0.3.6-py3-none-any.whl", hash = "sha256:a07ffd2351b8c678dfc4a856a3005f8067aea51d6ba6c700796a4d9e280f39f0"},
-    {file = "dill-0.3.6.tar.gz", hash = "sha256:e5db55f3687856d8fbdab002ed78544e1c4559a130302693d839dfe8f93f2373"},
-]
-
-[package.extras]
-graph = ["objgraph (>=1.7.2)"]
-
 [[package]]
 name = "dill"
 version = "0.3.7"
@@ -301,38 +287,38 @@ files = [
 
 [[package]]
 name = "mypy"
-version = "1.5.1"
+version = "1.8.0"
 description = "Optional static typing for Python"
 optional = false
 python-versions = ">=3.8"
 files = [
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-    {file = "mypy-1.5.1-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:abed92d9c8f08643c7d831300b739562b0a6c9fcb028d211134fc9ab20ccad5d"},
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+    {file = "mypy-1.8.0-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:ab3c84fa13c04aeeeabb2a7f67a25ef5d77ac9d6486ff33ded762ef353aa5592"},
+    {file = "mypy-1.8.0-cp39-cp39-win_amd64.whl", hash = "sha256:99b00bc72855812a60d253420d8a2eae839b0afa4938f09f4d2aa9bb4654263a"},
+    {file = "mypy-1.8.0-py3-none-any.whl", hash = "sha256:538fd81bb5e430cc1381a443971c0475582ff9f434c16cd46d2c66763ce85d9d"},
+    {file = "mypy-1.8.0.tar.gz", hash = "sha256:6ff8b244d7085a0b425b56d327b480c3b29cafbd2eff27316a004f9a7391ae07"},
 ]
 
 [package.dependencies]
@@ -343,6 +329,7 @@ typing-extensions = ">=4.1.0"
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
 install-types = ["pip"]
+mypyc = ["setuptools (>=50)"]
 reports = ["lxml"]
 
 [[package]]
@@ -693,4 +680,4 @@ test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "afc8d91117db1c42f85be8674f87f24dc178d433b3b204f33194074241079792"
+content-hash = "dd34c71388c6841344390f549f2ea9a07245e373146fee26f6bcf40a4da349a7"
diff --git a/pyproject.toml b/pyproject.toml
index e3e666f..7f2d5b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ PsychroLib = "^2.5.0"
 black = ">=22.3,<24.0"
 flake8 = "^5.0.4"
 isort = "^5.10.1"
-mypy = ">=0.991,<1.6"
+mypy = ">=0.991,<1.9"
 pydocstyle = "^6.1.1"
 pylint = ">=2.12.1,<4.0.0"
 pytest = "^7.1"