diff --git a/functions/ocr/app/constraints.txt b/functions/ocr/app/constraints.txt
new file mode 100644
index 00000000000..583b1971144
--- /dev/null
+++ b/functions/ocr/app/constraints.txt
@@ -0,0 +1,7 @@
+# Explicitly listing more packages than just the direct script dependencies to
+# avoid PIP taking too long while resolving dependencies.
+# See https://pip.pypa.io/en/stable/topics/dependency-resolution/#backtracking
+google-api-core==2.11.0
+google-auth==2.16.2
+google-cloud-core==2.3.2
+protobuf==4.22.1
\ No newline at end of file
diff --git a/functions/ocr/app/requirements.txt b/functions/ocr/app/requirements.txt
index 145a1f80af2..33db3cbaf41 100644
--- a/functions/ocr/app/requirements.txt
+++ b/functions/ocr/app/requirements.txt
@@ -1,4 +1,4 @@
-google-cloud-pubsub==2.15.0
+google-cloud-pubsub==2.15.1
 google-cloud-storage==2.7.0
 google-cloud-translate==3.11.0
 google-cloud-vision==3.4.0