diff --git a/.docker/build/install-deps.sh b/.docker/build/install-deps.sh
index dd6ceef4..6a9b2c7f 100755
--- a/.docker/build/install-deps.sh
+++ b/.docker/build/install-deps.sh
@@ -19,7 +19,7 @@ fi
 # Install F*
 [[ -n "$FSTAR_HOME" ]]
 git clone --branch $FSTAR_BRANCH https://github.com/FStarLang/FStar "$FSTAR_HOME"
-opam install --deps-only "$FSTAR_HOME/fstar.opam"
+OPAMCONFIRMLEVEL=yes opam install --deps-only "$FSTAR_HOME/fstar.opam"
 OTHERFLAGS='--admit_smt_queries true' make -j 24 -C "$FSTAR_HOME"
 
 # Install other deps
diff --git a/.docker/build/install-other-deps.sh b/.docker/build/install-other-deps.sh
index 32cb1706..a43f0cae 100755
--- a/.docker/build/install-other-deps.sh
+++ b/.docker/build/install-other-deps.sh
@@ -7,4 +7,4 @@ build_home="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 cd "$build_home/../.."
 
 grep -v '"fstar"' < karamel.opam > karamel-nofstar.opam
-opam install --deps-only ./karamel-nofstar.opam
+OPAMCONFIRMLEVEL=yes opam install --deps-only ./karamel-nofstar.opam