diff --git a/install.sh b/install.sh
index d963e43..1f3823f 100755
--- a/install.sh
+++ b/install.sh
@@ -70,6 +70,10 @@ if [ "${1:-}" = "-update" ]; then
 
     info "Rebuilding binary..."
     if command -v go &>/dev/null; then
+        export GOMODCACHE="${INSTALL_DIR}/.go/mod"
+        export GOPATH="${INSTALL_DIR}/.go"
+        export GOCACHE="${INSTALL_DIR}/.go/build"
+        mkdir -p "${GOMODCACHE}" "${GOCACHE}" 2>/dev/null || sudo_if mkdir -p "${GOMODCACHE}" "${GOCACHE}"
         CGO_ENABLED=0 go build -ldflags="-s -w" -o app .
     else
         warn "Go not found — downloading pre-built binary..."
@@ -126,10 +130,11 @@ esac
 
 if command -v go &>/dev/null; then
     info "Building binary from source (pure Go, no CGO)..."
-    # Use a writable module cache — the user's home may not be writable
+    # Use a writable cache — the user's home (/app/) may not be writable
     export GOMODCACHE="${INSTALL_DIR}/.go/mod"
     export GOPATH="${INSTALL_DIR}/.go"
-    mkdir -p "${GOMODCACHE}" 2>/dev/null || sudo_if mkdir -p "${GOMODCACHE}"
+    export GOCACHE="${INSTALL_DIR}/.go/build"
+    mkdir -p "${GOMODCACHE}" "${GOCACHE}" 2>/dev/null || sudo_if mkdir -p "${GOMODCACHE}" "${GOCACHE}"
     CGO_ENABLED=0 go build -ldflags="-s -w" -o app .
 else
     info "Go not found — downloading pre-built binary..."