cap deps versions for compat with old Python

build-wheels.sh

@@ -5,11 +5,11 @@ PYBINS=(
 #   "/opt/python/cp27-cp27m/bin"  # Gone from manulinux2014
 #   "/opt/python/cp27-cp27mu/bin" # Gone from manulinux2014
 #    "/opt/python/cp35-cp35m/bin"
-   "/opt/python/cp36-cp36m/bin"
+   # "/opt/python/cp36-cp36m/bin"
    "/opt/python/cp37-cp37m/bin"
-   "/opt/python/cp38-cp38/bin"
-   "/opt/python/cp39-cp39/bin"
-   "/opt/python/cp310-cp310/bin"
+   # "/opt/python/cp38-cp38/bin"
+   # "/opt/python/cp39-cp39/bin"
+   # "/opt/python/cp310-cp310/bin"
   )
 
 # Compile wheels

pyproject.toml

@@ -52,9 +52,9 @@ dependencies = [
     "wheel>=0.22",
     "numpy>=1.19.5",
     "scipy>=1.5.4",
-    "scikit-image>=0.17.2",
+    "scikit-image>=0.17.2,<0.20",
     "tifffile>=2020.8.25",
-    "matplotlib>=3.3.4",
+    "matplotlib>=3.3.4,<3.6",
     "SimpleITK>=2.0.2",
     "progressbar>=2.5",
     "python-decouple>=3.4",