diff --git a/scripts/install_anvil.sh b/scripts/install_anvil.sh
index c573ac31c..90062ef56 100755
--- a/scripts/install_anvil.sh
+++ b/scripts/install_anvil.sh
@@ -1,52 +1,74 @@
 #!/usr/bin/env bash
 
-# Install Anvil
+# Install Foundry binaries (forge, cast, anvil, chisel).
+#
+# We bypass `foundryup` and pull the release tarball straight from GitHub.
 
-REQUIRED_FOUNDRY_VERSION="$1"
+set -euo pipefail
 
-if command -v anvil &> /dev/null; then
-    # Foundry is already installed; check the current version.
+REQUIRED_FOUNDRY_VERSION="${1:-}"
+if [ -z "$REQUIRED_FOUNDRY_VERSION" ]; then
+    echo "usage: install_anvil.sh <foundry-version>" >&2
+    exit 1
+fi
+
+if command -v anvil >/dev/null 2>&1; then
     CURRENT_FOUNDRY_VERSION=$(anvil --version 2>/dev/null | awk '{print $2}')
 
     if [ -n "$CURRENT_FOUNDRY_VERSION" ]; then
-        # Compare CURRENT_FOUNDRY_VERSION < REQUIRED_FOUNDRY_VERSION using sort -V
         lower_version=$(printf '%s\n%s\n' "$CURRENT_FOUNDRY_VERSION" "$REQUIRED_FOUNDRY_VERSION" | sort -V | head -n1)
 
         if [ "$lower_version" != "$REQUIRED_FOUNDRY_VERSION" ]; then
             echo "Anvil is already installed with version $CURRENT_FOUNDRY_VERSION, which is older than the required $REQUIRED_FOUNDRY_VERSION. Please update Foundry manually if needed."
         fi
     fi
-else
-    BASE_DIR="${XDG_CONFIG_HOME:-$HOME}"
-    FOUNDRY_DIR="${FOUNDRY_DIR:-"$BASE_DIR/.foundry"}"
-    FOUNDRY_BIN_DIR="$FOUNDRY_DIR/bin"
+    exit 0
+fi
 
-    echo "Installing Foundry..."
-    curl -L https://foundry.paradigm.xyz | bash
+case "$(uname -s)" in
+    Darwin) PLATFORM=darwin ;;
+    Linux)  PLATFORM=linux  ;;
+    *) echo "Unsupported platform: $(uname -s)" >&2; exit 1 ;;
+esac
 
-    # Add Foundry to PATH for this script session
-    export PATH="$FOUNDRY_BIN_DIR:$PATH"
+case "$(uname -m)" in
+    x86_64|amd64)   ARCH=amd64 ;;
+    arm64|aarch64)  ARCH=arm64 ;;
+    *) echo "Unsupported architecture: $(uname -m)" >&2; exit 1 ;;
+esac
 
-    # Verify foundryup is available
-    if ! command -v foundryup >/dev/null 2>&1; then
-        echo "Error: foundryup installation failed or not found in $FOUNDRY_BIN_DIR"
-        exit 1
-    fi
+BASE_DIR="${XDG_CONFIG_HOME:-$HOME}"
+FOUNDRY_DIR="${FOUNDRY_DIR:-"$BASE_DIR/.foundry"}"
+FOUNDRY_BIN_DIR="$FOUNDRY_DIR/bin"
 
-    # Run foundryup to install the required version
-    if [ -n "$REQUIRED_FOUNDRY_VERSION" ]; then
-        echo "Installing Foundry tools version $REQUIRED_FOUNDRY_VERSION..."
-        foundryup --install "$REQUIRED_FOUNDRY_VERSION"
-    else
-        echo "Installing latest Foundry tools..."
-        foundryup
-    fi
+TAG="v${REQUIRED_FOUNDRY_VERSION}"
+ASSET="foundry_${TAG}_${PLATFORM}_${ARCH}.tar.gz"
+URL="https://github.com/foundry-rs/foundry/releases/download/${TAG}/${ASSET}"
 
-    # Verify anvil was installed
-    if ! command -v anvil >/dev/null 2>&1; then
-        echo "Error: anvil installation failed"
-        exit 1
-    fi
+echo "Installing Foundry ${TAG} for ${PLATFORM}/${ARCH}..."
+mkdir -p "$FOUNDRY_BIN_DIR"
 
-    echo "Anvil successfully installed: $(anvil --version)"
-fi
\ No newline at end of file
+tmpdir=$(mktemp -d)
+trap 'rm -rf "$tmpdir"' EXIT
+archive="$tmpdir/foundry.tar.gz"
+
+curl -fL --retry 5 --retry-delay 2 --retry-all-errors -o "$archive" "$URL"
+
+# Validate the archive before extracting -- catches truncated/HTML responses
+# loudly instead of leaving a half-installed Foundry on disk.
+tar tzf "$archive" >/dev/null
+
+tar -xzf "$archive" -C "$FOUNDRY_BIN_DIR" forge cast anvil chisel
+chmod +x "$FOUNDRY_BIN_DIR"/{forge,cast,anvil,chisel}
+
+export PATH="$FOUNDRY_BIN_DIR:$PATH"
+if [ -n "${GITHUB_PATH:-}" ]; then
+    echo "$FOUNDRY_BIN_DIR" >> "$GITHUB_PATH"
+fi
+
+if ! command -v anvil >/dev/null 2>&1; then
+    echo "Error: anvil installation failed" >&2
+    exit 1
+fi
+
+echo "Anvil successfully installed: $(anvil --version)"