diff --git a/Dockerfile b/Dockerfile
index dfa205e..42857e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,11 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 
 WORKDIR /app
 
+# Install build tools for C extensions (e.g. TgCrypto), then clean up
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends gcc && \
+    rm -rf /var/lib/apt/lists/*
+
 # Install deps first — layer cache reuse on code-only changes
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt