diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 137aff862..e845bd98f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1335,8 +1335,6 @@ jobs:
                 -DCODE_COVERAGE=${{ env.CODE_COVERAGE }}        \
                 -DCMAKE_INSTALL_PREFIX=$PREFIX         \
                 -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ON            \
-                -DZLIB_INCLUDE_DIR=$PREFIX/include \
-                -DZLIB_LIBRARY=$PREFIX/lib/ \
                 ../
         else
           emcmake cmake -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }}    \
@@ -1349,8 +1347,6 @@ jobs:
                 -DCODE_COVERAGE=${{ env.CODE_COVERAGE }}    \
                 -DCMAKE_INSTALL_PREFIX=$PREFIX      \
                 -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ON            \
-                -DZLIB_INCLUDE_DIR=$PREFIX/include \
-                -DZLIB_LIBRARY=$PREFIX/lib/ \
                 ../
         fi
         
diff --git a/.github/workflows/deploy-pages.yml b/.github/workflows/deploy-pages.yml
index 2a14d9a34..ebccaf279 100644
--- a/.github/workflows/deploy-pages.yml
+++ b/.github/workflows/deploy-pages.yml
@@ -129,8 +129,6 @@ jobs:
                 -DCODE_COVERAGE=${{ env.CODE_COVERAGE }}        \
                 -DCMAKE_INSTALL_PREFIX=$PREFIX         \
                 -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ON            \
-                -DZLIB_INCLUDE_DIR=$PREFIX/include \
-                -DZLIB_LIBRARY=$PREFIX/lib/ \
                 ../
         else
           emcmake cmake -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }}    \
@@ -143,8 +141,6 @@ jobs:
                 -DCODE_COVERAGE=${{ env.CODE_COVERAGE }}    \
                 -DCMAKE_INSTALL_PREFIX=$PREFIX      \
                 -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ON            \
-                -DZLIB_INCLUDE_DIR=$PREFIX/include \
-                -DZLIB_LIBRARY=$PREFIX/lib/ \
                 ../
         fi
         
diff --git a/environment-wasm.yml b/environment-wasm.yml
index 1455b4af2..e52858221 100644
--- a/environment-wasm.yml
+++ b/environment-wasm.yml
@@ -2,7 +2,6 @@ name: CppInterOp-wasm
 channels:
   - https://repo.mamba.pm/emscripten-forge
 dependencies:
-  - zlib
   - nlohmann_json
   - xeus-lite
   - xeus