diff --git a/common/dff/requirements.txt b/common/dff/requirements.txt
index a7a24b2862..a1e5f8a42f 100644
--- a/common/dff/requirements.txt
+++ b/common/dff/requirements.txt
@@ -5,7 +5,7 @@ flask==1.1.1
 itsdangerous==2.0.1
 gunicorn==19.9.0
 healthcheck==1.3.3
-df_engine>=0.8.1
+df_engine==0.8.1
 # test
 requests==2.22.0
 jinja2<=3.0.3
diff --git a/services/text_qa/Dockerfile b/services/text_qa/Dockerfile
index 1e82df8789..f7fb29b616 100644
--- a/services/text_qa/Dockerfile
+++ b/services/text_qa/Dockerfile
@@ -12,7 +12,7 @@ ENV COMMIT=$COMMIT
 COPY ./requirements.txt /src/requirements.txt
 RUN pip install -r /src/requirements.txt
 
-RUN apt-get update && apt-get install git -y
+RUN rm -r /etc/apt/sources.list.d && apt-get update && apt-get install git -y
 RUN pip install git+https://github.com/deepmipt/DeepPavlov.git@${COMMIT}
 
 COPY . /src
diff --git a/skills/dff_book_skill/tests/favs_out.json b/skills/dff_book_skill/tests/favs_out.json
index cbb7ed923f..37d635989f 100644
--- a/skills/dff_book_skill/tests/favs_out.json
+++ b/skills/dff_book_skill/tests/favs_out.json
@@ -1,7 +1,7 @@
 [
     [
         "71 years  ago! I didn't exist at that time.",
-        0.95,
+        0.85,
         {
             "dff_book_skill_state": {
                 "shared_memory": {},