diff --git a/poetry.lock b/poetry.lock
index 57b2da4..9b39fe8 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1242,49 +1242,62 @@ files = [
 
 [[package]]
 name = "matplotlib"
-version = "3.8.3"
+version = "3.7.0"
 description = "Python plotting package"
 optional = false
-python-versions = ">=3.9"
+python-versions = ">=3.8"
 files = [
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+    {file = "matplotlib-3.7.0-pp39-pypy39_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:71b751d06b2ed1fd017de512d7439c0259822864ea16731522b251a27c0b2ede"},
+    {file = "matplotlib-3.7.0-pp39-pypy39_pp73-win_amd64.whl", hash = "sha256:b51ab8a5d5d3bbd4527af633a638325f492e09e45e78afdf816ef55217a09664"},
+    {file = "matplotlib-3.7.0.tar.gz", hash = "sha256:8f6efd313430d7ef70a38a3276281cb2e8646b3a22b3b21eb227da20e15e6813"},
 ]
 
 [package.dependencies]
 contourpy = ">=1.0.1"
 cycler = ">=0.10"
 fonttools = ">=4.22.0"
-kiwisolver = ">=1.3.1"
-numpy = ">=1.21,<2"
+kiwisolver = ">=1.0.1"
+numpy = ">=1.20"
 packaging = ">=20.0"
-pillow = ">=8"
+pillow = ">=6.2.0"
 pyparsing = ">=2.3.1"
 python-dateutil = ">=2.7"
 
@@ -1796,20 +1809,20 @@ test = ["enum34", "ipaddress", "mock", "pywin32", "wmi"]
 
 [[package]]
 name = "pyam-iamc"
-version = "1.7.0"
+version = "1.9.0"
 description = "Analysis & visualization of integrated-assessment scenarios"
 optional = false
-python-versions = "<3.11,>=3.7.1"
+python-versions = "<3.12,>=3.7.1"
 files = [
-    {file = "pyam-iamc-1.7.0.tar.gz", hash = "sha256:0af22a23585ed30363e8755a7e2ac4a646df71c5375f57b3a9124fb567cd32e4"},
-    {file = "pyam_iamc-1.7.0-py3-none-any.whl", hash = "sha256:512a67ea145a09ab7db34b49ca70e81800f602ee46ad75a179c51f0a95cafb9b"},
+    {file = "pyam-iamc-1.9.0.tar.gz", hash = "sha256:a37f853b4e563628e78ff79a639d5636e25cdc2b5db35d13b5ac7c27ccdf6333"},
+    {file = "pyam_iamc-1.9.0-py3-none-any.whl", hash = "sha256:91f6841326197c5b32a511c33198e7dcf32cd47e02bb105bb3b0764bf7419acd"},
 ]
 
 [package.dependencies]
 httpx = {version = "*", extras = ["http2"]}
 iam-units = ">=2020.4.21"
 importlib-metadata = "*"
-matplotlib = ">=3.2.0"
+matplotlib = ">=3.5.0,<3.7.1"
 numpy = ">=1.19.0,<1.24"
 openpyxl = "*"
 pandas = ">=1.2.0"
@@ -1826,11 +1839,11 @@ wquantiles = "*"
 xlsxwriter = "*"
 
 [package.extras]
-docs = ["autodocsumm", "kaleido", "nbsphinx", "numpydoc", "pillow", "sphinx", "sphinx-gallery", "sphinxcontrib-bibtex (<2.0)", "sphinxcontrib-programoutput"]
+docs = ["autodocsumm", "kaleido", "nbsphinx", "numpydoc", "pillow", "sphinx", "sphinx-gallery"]
 optional-io-formats = ["datapackage", "pandas-datareader", "unfccc-di-api (>=3.0.1)", "xlrd"]
 optional-plotting = ["plotly"]
 tests = ["coverage", "coveralls", "pytest", "pytest-cov", "pytest-mpl"]
-tutorials = ["ipykernel", "jupyter-client", "nbconvert", "nbformat", "pypandoc"]
+tutorials = ["ipykernel", "jupyter-client", "nbconvert (>=7.3)", "nbformat", "pypandoc"]
 
 [[package]]
 name = "pybtex"
@@ -2918,4 +2931,4 @@ testing = ["big-O", "jaraco.functools", "jaraco.itertools", "more-itertools", "p
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.10, <3.11"
-content-hash = "24b78587cb44cf03d5d2a74b5599ba9824a78fcfa04b127f70cf5a98220ca3b0"
+content-hash = "a07d3ecb9ec6479240718b42fec57b544c2fc7f14fdacad466050d3ac6ae72a3"
diff --git a/pyproject.toml b/pyproject.toml
index 83a478f..e9f5114 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,10 +17,10 @@ dask = "^2024.2.0"
 distributed = "^2024.2.0"
 holoviews = "^1.18.3"
 hvplot = "^0.9.2"
-matplotlib = "^3.8.3"
+matplotlib = "^3.6"
 numpy = "^1.23"
 pandas = "^2.2.0"
-pyam-iamc = "^1.7"
+pyam-iamc = "^1.8"
 pyyaml = "^6.0.1"
 rich = "^13.7.0"
 scipy = "^1.12.0"