diff --git a/.github/actions/setup-deps/action.yml b/.github/actions/setup-deps/action.yml
index ffd0f733..7a0669c8 100644
--- a/.github/actions/setup-deps/action.yml
+++ b/.github/actions/setup-deps/action.yml
@@ -34,7 +34,7 @@ runs:
         echo "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-${{inputs.llvm-version}} main" | sudo tee /etc/apt/sources.list.d/llvm.list
         wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
         sudo apt-get update
-        sudo apt-get install -y llvm-${{inputs.llvm-version}}-dev clang-${{inputs.llvm-version}} libclang-${{inputs.llvm-version}}-dev lld-${{inputs.llvm-version}} pkg-config libgc-dev libssl-dev zlib1g-dev libffi-dev libcjson-dev libunwind-${{inputs.llvm-version}}-dev libuv1-dev libc++-${{inputs.llvm-version}}-dev 
+        sudo apt-get install -y llvm-${{inputs.llvm-version}}-dev clang-${{inputs.llvm-version}} libclang-${{inputs.llvm-version}}-dev lld-${{inputs.llvm-version}} libunwind-${{inputs.llvm-version}}-dev libc++-${{inputs.llvm-version}}-dev pkg-config libgc-dev libssl-dev zlib1g-dev libffi-dev libcjson-dev libuv1-dev 
         echo "PATH=/usr/lib/llvm-${{inputs.llvm-version}}/bin:$PATH" >> $GITHUB_ENV
 
         # Install optional deps for demos.
diff --git a/README.md b/README.md
index 222e6f12..804a9237 100644
--- a/README.md
+++ b/README.md
@@ -377,7 +377,7 @@ brew link --overwrite llvm@19 lld@19 libffi
 echo "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-19 main" | sudo tee /etc/apt/sources.list.d/llvm.list
 wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
 sudo apt-get update
-sudo apt-get install -y llvm-19-dev clang-19 libclang-19-dev lld-19 pkg-config libgc-dev libssl-dev zlib1g-dev libcjson-dev libsqlite3-dev libunwind-dev libuv1-dev
+sudo apt-get install -y llvm-19-dev clang-19 libclang-19-dev lld-19 libunwind-19-dev libc++-19-dev pkg-config libgc-dev libssl-dev zlib1g-dev libcjson-dev libsqlite3-dev libuv1-dev
 sudo apt-get install -y python3.12-dev # optional
 #curl https://raw.githubusercontent.com/goplus/llgo/refs/heads/main/install.sh | bash
 ./install.sh
diff --git a/doc/_readme/scripts/install_ubuntu.sh b/doc/_readme/scripts/install_ubuntu.sh
index 48be1b36..f139230e 100644
--- a/doc/_readme/scripts/install_ubuntu.sh
+++ b/doc/_readme/scripts/install_ubuntu.sh
@@ -2,7 +2,7 @@
 echo "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-19 main" | sudo tee /etc/apt/sources.list.d/llvm.list
 wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
 sudo apt-get update
-sudo apt-get install -y llvm-19-dev clang-19 libclang-19-dev lld-19 pkg-config libgc-dev libssl-dev zlib1g-dev libcjson-dev libsqlite3-dev libunwind-dev libuv1-dev
+sudo apt-get install -y llvm-19-dev clang-19 libclang-19-dev lld-19 libunwind-19-dev libc++-19-dev pkg-config libgc-dev libssl-dev zlib1g-dev libcjson-dev libsqlite3-dev libuv1-dev
 sudo apt-get install -y python3.12-dev # optional
 #curl https://raw.githubusercontent.com/goplus/llgo/refs/heads/main/install.sh | bash
 ./install.sh
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