diff --git a/Orange/base.py b/Orange/base.py
index c0d5f084a08..3566485a4f6 100644
--- a/Orange/base.py
+++ b/Orange/base.py
@@ -520,11 +520,14 @@ def params(self, value):
     def _get_sklparams(self, values):
         skllearner = self.__wraps__
         if skllearner is not None:
-            spec = inspect.getargs(skllearner.__init__.__code__)
+            spec = list(
+                inspect.signature(skllearner.__init__).parameters.keys()
+            )
             # first argument is 'self'
-            assert spec.args[0] == "self"
-            params = {name: values[name] for name in spec.args[1:]
-                      if name in values}
+            assert spec[0] == "self"
+            params = {
+                name: values[name] for name in spec[1:] if name in values
+            }
         else:
             raise TypeError("Wrapper does not define '__wraps__'")
         return params
diff --git a/Orange/projection/base.py b/Orange/projection/base.py
index 28fea302eb0..b07f0cb39e1 100644
--- a/Orange/projection/base.py
+++ b/Orange/projection/base.py
@@ -196,11 +196,14 @@ def params(self, value):
     def _get_sklparams(self, values):
         sklprojection = self.__wraps__
         if sklprojection is not None:
-            spec = inspect.getargs(sklprojection.__init__.__code__)
+            spec = list(
+                inspect.signature(sklprojection.__init__).parameters.keys()
+            )
             # first argument is 'self'
-            assert spec.args[0] == "self"
-            params = {name: values[name] for name in spec.args[1:]
-                      if name in values}
+            assert spec[0] == "self"
+            params = {
+                name: values[name] for name in spec[1:] if name in values
+            }
         else:
             raise TypeError("Wrapper does not define '__wraps__'")
         return params
diff --git a/requirements-core.txt b/requirements-core.txt
index 35c1e22b417..a6b0fd35683 100644
--- a/requirements-core.txt
+++ b/requirements-core.txt
@@ -1,7 +1,7 @@
 pip>=9.0
 numpy>=1.16.0
 scipy>=0.16.1
-scikit-learn>=0.22.0,<0.23  # temp fix: https://github.com/biolab/orange3/pull/4768
+scikit-learn>=0.22.0,!=0.23.0  # 0.23.0 have error with slow k-means, it will be fixed in 0.23.1
 bottleneck>=1.0.0
 # Reading Excel files
 xlrd>=0.9.2