diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9f701c7..cebeb15 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@
 
 CMAKE_MINIMUM_REQUIRED(VERSION 3.17)
 
-PROJECT(OpenMMNonbondedSlicing)
+PROJECT(OpenMMNonbondedSlicing VERSION 0.1)
 
 # We need to know where OpenMM is installed so we can access the headers and libraries.
 SET(OPENMM_DIR "/usr/local/openmm" CACHE PATH "Where OpenMM is installed")
diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index 9625d6d..ee03c42 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -1,5 +1,6 @@
 set(WRAP_FILE NonbondedSlicingWrapper.cpp)
 set(MODULE_NAME nonbondedslicing)
+configure_file(nonbondedslicing.i ${CMAKE_CURRENT_BINARY_DIR})
 
 # Execute SWIG to generate source code for the Python module.
 
@@ -10,8 +11,8 @@ add_custom_command(
         -doxygen
         -o "${WRAP_FILE}"
         "-I${OPENMM_DIR}/include"
-        "${CMAKE_CURRENT_SOURCE_DIR}/nonbondedslicing.i"
-    DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/nonbondedslicing.i"
+        "nonbondedslicing.i"
+    DEPENDS "nonbondedslicing.i"
     WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
 )
 
diff --git a/python/nonbondedslicing.i b/python/nonbondedslicing.i
index ed0fad9..cf9f558 100644
--- a/python/nonbondedslicing.i
+++ b/python/nonbondedslicing.i
@@ -17,6 +17,8 @@
 
 %pythoncode %{
 from openmm import unit
+
+__version__ = "@CMAKE_PROJECT_VERSION@"
 %}
 
 /*