diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 7a6f95f4..88129082 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -35,7 +35,7 @@ jobs:
         with:
           set-safe-directory: true
           repository: open-quantum-safe/liboqs
-          ref: main
+          ref: 0.9.1
           path: liboqs
       - name: Retrieve OpenSSL32 from cache
         id: cache-openssl32
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index a03fc8bb..518f6583 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -38,7 +38,7 @@ jobs:
         with:
           set-safe-directory: true
           repository: open-quantum-safe/liboqs
-          ref: main
+          ref: 0.9.1
           path: liboqs
       - name: Install cygwin
         uses: cygwin/cygwin-install-action@master
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c930ad3f..67786df3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ else()
 cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
 endif()
 project(oqs-provider LANGUAGES C)
-set(OQSPROVIDER_VERSION_TEXT "0.5.2")
+set(OQSPROVIDER_VERSION_TEXT "0.5.3")
 set(CMAKE_C_STANDARD 11)
 set_property(GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS ON)
 if(CMAKE_BUILD_TYPE STREQUAL "Debug")
diff --git a/scripts/fullbuild.sh b/scripts/fullbuild.sh
index a411d901..d90d1074 100755
--- a/scripts/fullbuild.sh
+++ b/scripts/fullbuild.sh
@@ -29,7 +29,7 @@ if [ $# -gt 0 ]; then
 fi
 
 if [ -z "$LIBOQS_BRANCH" ]; then
-   export LIBOQS_BRANCH=main
+   export LIBOQS_BRANCH=0.9.1
 fi
 
 if [ -z "$OQS_ALGS_ENABLED" ]; then