diff --git a/4.5/Dockerfile b/4.5/Dockerfile
index d233eea..e8cb5f2 100644
--- a/4.5/Dockerfile
+++ b/4.5/Dockerfile
@@ -34,6 +34,8 @@ RUN  \
         libicu-dev \
         python3-dev \
         python3-pip \
+        python3-icu \
+        python3-datrie \
         # PostgreSQL.
         postgresql-contrib \
         postgresql-server-dev-16 \
diff --git a/5.0/Dockerfile b/5.0/Dockerfile
index 073332f..18df8ec 100644
--- a/5.0/Dockerfile
+++ b/5.0/Dockerfile
@@ -34,6 +34,8 @@ RUN  \
         libicu-dev \
         python3-dev \
         python3-pip \
+        python3-icu \
+        python3-datrie \
         # PostgreSQL.
         postgresql-contrib \
         postgresql-server-dev-16 \