diff --git a/configuration/buildHelper.py b/configuration/buildHelper.py
index ee1d104..d6971b8 100755
--- a/configuration/buildHelper.py
+++ b/configuration/buildHelper.py
@@ -98,10 +98,10 @@ def main(factoryFile,package,buildDir):
 #    import isce
     import filecmp
     try:
-        import imp
+        import importlib
         factoryFile = os.path.abspath(factoryFile)
-        mod = imp.find_module(factoryFile.replace('.py',''))
-        factModule = imp.load_module(factoryFile.replace('.py',''),mod[0],mod[1],mod[2])
+        mod = importlib.util.spec_from_file_location('.', factoryFile)
+        factModule = mod.loader.load_module()
         factoriesInfo = factModule.getFactoriesInfo()
         nameList = []
         for k,v in factoriesInfo.items():
diff --git a/contrib/stack/stripmapStack/stripmapWrapper.py b/contrib/stack/stripmapStack/stripmapWrapper.py
index 7f52d3b..7d27b91 100755
--- a/contrib/stack/stripmapStack/stripmapWrapper.py
+++ b/contrib/stack/stripmapStack/stripmapWrapper.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
-import os, imp, sys
+import os, sys
+import importlib
 import argparse
 import configparser
 
@@ -21,7 +22,7 @@ class ConfigParser:
     # Setting up and reading config 
     Config = configparser.ConfigParser()
     Config.optionxform = str
-    Config.readfp(content)
+    Config.read_file(content)
 
     # Reading the function sequence followed by input parameters 
     # followed by the function parameters
@@ -94,14 +95,12 @@ class ConfigParser:
 
     # If any of the following calls raises an exception,
     # there's a problem we can't handle -- let the caller handle it.
-    fp, pathname, description = imp.find_module(name)
+    spec = importlib.util.find_spec(name)
 
     try:
-      return imp.load_module(name, fp, pathname, description)
-    finally:
-      # Since we may exit via an exception, close fp explicitly.
-      if fp:
-        fp.close()
+      return spec.loader.load_module()
+    except ImportError:
+      print('module {} not found'.format(name))
 
 # Check existence of the input file
 def  check_if_files_exist(Files, ftype='input'):
diff --git a/contrib/stack/topsStack/SentinelWrapper.py b/contrib/stack/topsStack/SentinelWrapper.py
index 8402e43..30b4a19 100755
--- a/contrib/stack/topsStack/SentinelWrapper.py
+++ b/contrib/stack/topsStack/SentinelWrapper.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
-import os, imp, sys
+import os, sys
+import importlib
 import argparse
 import configparser
 
@@ -22,7 +23,7 @@ class ConfigParser:
     # Setting up and reading config 
     Config = configparser.ConfigParser()
     Config.optionxform = str
-    Config.readfp(content)
+    Config.read_file(content)
 
     # Reading the function sequence followed by input parameters 
     # followed by the function parameters
@@ -157,14 +158,12 @@ class ConfigParser:
 
     # If any of the following calls raises an exception,
     # there's a problem we can't handle -- let the caller handle it.
-    fp, pathname, description = imp.find_module(name)
+    spec = importlib.util.find_spec(name)
 
     try:
-      return imp.load_module(name, fp, pathname, description)
-    finally:
-      # Since we may exit via an exception, close fp explicitly.
-      if fp:
-        fp.close()
+      return spec.loader.load_module()
+    except ImportError:
+      print('module {} not found'.format(name))
 
 # Check existence of the input file
 def  check_if_files_exist(Files, ftype='input'):