diff --git a/CMakeLists.txt b/CMakeLists.txt
index 726dbfd0..10f76abc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -92,7 +92,7 @@ endif()
 
 set(xeus_REQUIRED_VERSION 5.0.0)
 set(xeus_zmq_REQUIRED_VERSION 3.0.0)
-set(CppInterOp_REQUIRED_VERSION 1.8.0)
+set(CppInterOp_REQUIRED_VERSION 1.7.0)
 set(xeus_lite_REQUIRED_VERSION 3.2.1)
 
 if (NOT TARGET xeus AND NOT TARGET xeus-static)
diff --git a/README.md b/README.md
index 377d3c7c..06068c4b 100644
--- a/README.md
+++ b/README.md
@@ -207,7 +207,7 @@ http://xeus-cpp.readthedocs.io
 
 | `xeus-cpp` | `xeus-zmq`      | `CppInterOp` | `pugixml` | `cpp-argparse`| `nlohmann_json` |
 |------------|-----------------|--------------|-----------|---------------|-----------------|
-|  main      |  3.1.0 | 1.8.0      | 1.15    | 3.2    | 3.12.0   |
+|  main      |  3.1.0 | 1.7.0      | 1.15    | 3.2    | 3.12.0   |
 
 ## Contributing
 
diff --git a/environment-dev.yml b/environment-dev.yml
index a9c3c681..9a984818 100644
--- a/environment-dev.yml
+++ b/environment-dev.yml
@@ -5,13 +5,13 @@ dependencies:
   # Build dependencies
   - make
   - cmake
-  - cxx-compiler
+  - cxx-compiler=1.7.0
   # Host dependencies
   - xeus>=5.0.0
   - xeus-zmq<4.0
   - nlohmann_json
   - nlohmann_json-abi
-  - CppInterOp>=1.8
+  - CppInterOp<1.8
   - pugixml
   - cpp-argparse
   # Test dependencies
diff --git a/environment-wasm-host.yml b/environment-wasm-host.yml
index ef111cae..e32e077a 100644
--- a/environment-wasm-host.yml
+++ b/environment-wasm-host.yml
@@ -7,7 +7,7 @@ dependencies:
   - nlohmann_json-abi
   - xeus-lite
   - xeus
-  - CppInterOp>=1.8
+  - CppInterOp<1.8
   - cpp-argparse
   - pugixml
   - doctest
diff --git a/include/xeus-cpp/xinterpreter.hpp b/include/xeus-cpp/xinterpreter.hpp
index 92b4e2c7..29eaf13b 100644
--- a/include/xeus-cpp/xinterpreter.hpp
+++ b/include/xeus-cpp/xinterpreter.hpp
@@ -16,7 +16,7 @@
 #include <string>
 #include <vector>
 
-#include <CppInterOp/CppInterOp.h>
+#include "clang/Interpreter/CppInterOp.h"  // from CppInterOp package
 
 #include <nlohmann/json.hpp>
 
diff --git a/src/xinspect.cpp b/src/xinspect.cpp
index 09a1933d..2511a5ac 100644
--- a/src/xinspect.cpp
+++ b/src/xinspect.cpp
@@ -14,7 +14,7 @@
 
 #include "xinspect.hpp"
 
-#include <CppInterOp/CppInterOp.h>
+#include "clang/Interpreter/CppInterOp.h"
 
 namespace xcpp
 {