diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2e2eb2ce..28cd4860 100755
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,32 @@
 stages:
+  - check
   - deploy
 
+check_lib_reversion:
+  stage: check
+  except:
+    - master
+    - /^release\/v/
+  image: $CI_DOCKER_REGISTRY/esp32-ci-env
+  script:
+    - GIT_COMMIT_ID=`git log --pretty="%s" -1 | grep -o '([0-9a-f]*)' | tail -1 | cut -c 2-8`
+    - echo "GIT_COMMIT_ID is "$GIT_COMMIT_ID
+    - test $(echo -n $GIT_COMMIT_ID | wc -c) -eq 7
+    - grep $GIT_COMMIT_ID libcoexist.a
+    - grep $GIT_COMMIT_ID libcore.a
+    - grep $GIT_COMMIT_ID libespnow.a
+    - grep $GIT_COMMIT_ID libespnow.a
+    - grep $GIT_COMMIT_ID libnet80211.a
+    - grep $GIT_COMMIT_ID libpp.a
+    - grep $GIT_COMMIT_ID libsmartconfig.a
+    - grep $GIT_COMMIT_ID libwps.a
+    - grep $GIT_COMMIT_ID libwpa.a
+    - grep $GIT_COMMIT_ID libwpa2.a
+    - grep $GIT_COMMIT_ID-remote libnet80211.a
+    - test $(grep $GIT_COMMIT_ID-dirty *.a | wc -l) -eq 0
+    - test $(xtensa-esp32-elf-nm *.a | grep -w printf | wc -l) -eq 0
+    - test $(xtensa-esp32-elf-nm *.a | grep -w ets_printf | wc -l) -eq 0
+
 push_master_to_github:
   stage: deploy
   only:
diff --git a/libcoexist.a b/libcoexist.a
index ffb3db99..c2ba8056 100644
Binary files a/libcoexist.a and b/libcoexist.a differ
diff --git a/libcore.a b/libcore.a
index bb5eb1dd..6f204d2d 100644
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diff --git a/libespnow.a b/libespnow.a
index 6689a059..7832471c 100644
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diff --git a/libmesh.a b/libmesh.a
index b8b83232..2306dfd2 100644
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diff --git a/libnet80211.a b/libnet80211.a
index 30d017b3..6a0d5b9a 100644
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diff --git a/libpp.a b/libpp.a
index e49d77aa..e1284156 100644
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diff --git a/libsmartconfig.a b/libsmartconfig.a
index db6a5341..e5942e6a 100644
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diff --git a/libwpa.a b/libwpa.a
index 672315fd..1f174e1c 100644
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diff --git a/libwpa2.a b/libwpa2.a
index 48375b0b..9edc888f 100644
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diff --git a/libwps.a b/libwps.a
index f53ca988..acbce714 100644
Binary files a/libwps.a and b/libwps.a differ