diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c1a1565b..d5730a65 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,20 +40,11 @@ jobs:
       matrix:
         nginx_version:
           [
-            1.15.12,
-            1.16.1,
-            1.17.10,
-            1.18.0,
-            1.19.10,
-            1.20.2,
             1.21.6,
             1.22.1,
             1.23.4,
             1.24.0,
             1.25.5,
-            1.26.0,
-            1.26.1,
-            1.26.2,
             1.26.3,
             1.27.0,
             1.27.1,
diff --git a/build/Dockerfile b/build/Dockerfile
index daf2573f..179139a1 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -13,7 +13,7 @@ RUN apt-get update && \
     libtool \
     ssh \
     wget \
-    libpcre3 libpcre3-dev \
+    libpcre2-dev \
     zlib1g-dev
 
 ENV CFLAGS="-fPIC"
diff --git a/test/Dockerfile-test b/test/Dockerfile-test
index 8d35623d..aa12c939 100644
--- a/test/Dockerfile-test
+++ b/test/Dockerfile-test
@@ -14,7 +14,7 @@ RUN set -x \
   git \
   gnupg2 \
   jq \
-  libpcre3 libpcre3-dev \
+  libpcre2-dev \
   libssl-dev \
   python3 \
   software-properties-common \