diff --git a/cpp-ubuntu.Dockerfile b/cpp-ubuntu.Dockerfile
index 8073bc0..0f0c30d 100644
--- a/cpp-ubuntu.Dockerfile
+++ b/cpp-ubuntu.Dockerfile
@@ -4,6 +4,6 @@ ENV DEBIAN_FRONTEND noninteractive
 
 RUN apt-get update -y
 RUN apt-get install -y --no-install-recommends git build-essential cmake ninja-build python3 python3-pip
-RUN pip3 install --upgrade conan
+RUN pip3 install --upgrade conan==1.42.1
 RUN conan profile new default --detect
 RUN conan profile update settings.compiler.libcxx=libstdc++11 default