diff --git a/ops/conda_env/dev.yml b/ops/conda_env/dev.yml
index 37b55e4b..4d0705b9 100644
--- a/ops/conda_env/dev.yml
+++ b/ops/conda_env/dev.yml
@@ -13,7 +13,7 @@ dependencies:
 - coverage
 - codecov
 - ninja
-- lcov
+- lcov<2.0
 - cmake
 - llvm-openmp
 - cython
diff --git a/ops/cpp-python-coverage.sh b/ops/cpp-python-coverage.sh
index db5eb2f4..69aa550d 100755
--- a/ops/cpp-python-coverage.sh
+++ b/ops/cpp-python-coverage.sh
@@ -2,9 +2,6 @@
 
 set -euo pipefail
 
-echo "##[section]Installing lcov and Ninja..."
-sudo apt-get install lcov ninja-build
-
 echo "##[section]Building Treelite..."
 mkdir build/
 cd build/