diff --git a/docker/coturn/CHANGELOG.md b/docker/coturn/CHANGELOG.md
index cf14b6f..db3c734 100644
--- a/docker/coturn/CHANGELOG.md
+++ b/docker/coturn/CHANGELOG.md
@@ -4,6 +4,16 @@ Coturn TURN server Docker image changelog
 
 
 
+## [4.5.2-r2] · 2021-06-21
+[4.5.2-r2]: /../../tree/docker/4.5.2-r2
+
+### Upgraded
+
+- [Alpine Linux] 3.14: <https://alpinelinux.org/posts/Alpine-3.14.0-released.html>
+
+
+
+
 ## [4.5.2-r1] · 2021-06-03
 [4.5.2-r1]: /../../tree/docker/4.5.2-r1
 
diff --git a/docker/coturn/Makefile b/docker/coturn/Makefile
index 18050d6..1c6080d 100644
--- a/docker/coturn/Makefile
+++ b/docker/coturn/Makefile
@@ -21,7 +21,7 @@ COTURN_VER ?= 4.5.2
 COTURN_MIN_VER = $(strip $(shell echo $(COTURN_VER) | cut -d '.' -f1,2))
 COTURN_MAJ_VER = $(strip $(shell echo $(COTURN_VER) | cut -d '.' -f1))
 
-BUILD_REV ?= 1
+BUILD_REV ?= 2
 
 NAMESPACES := coturn \
               ghcr.io/coturn \
diff --git a/docker/coturn/README.md b/docker/coturn/README.md
index 4ebf1cd..e902823 100644
--- a/docker/coturn/README.md
+++ b/docker/coturn/README.md
@@ -15,8 +15,8 @@ Coturn TURN server Docker image
 
 ## Supported tags and respective `Dockerfile` links
 
-- [`4.5.2-r1`, `4.5.2-r0-debian`, `4.5.2`, `4.5.2-debian`, `4.5`, `4.5-debian`, `4`, `4-debian`, `debian`, `latest`][d1]
-- [`4.5.2-r1-alpine`, `4.5.2-alpine`, `4.5-alpine`, `4-alpine`, `alpine`][d2]
+- [`4.5.2-r2`, `4.5.2-r0-debian`, `4.5.2`, `4.5.2-debian`, `4.5`, `4.5-debian`, `4`, `4-debian`, `debian`, `latest`][d1]
+- [`4.5.2-r2-alpine`, `4.5.2-alpine`, `4.5-alpine`, `4-alpine`, `alpine`][d2]
 
 
 
diff --git a/docker/coturn/alpine/Dockerfile b/docker/coturn/alpine/Dockerfile
index 97cd0d3..d88bb3b 100644
--- a/docker/coturn/alpine/Dockerfile
+++ b/docker/coturn/alpine/Dockerfile
@@ -2,7 +2,7 @@
 # Dockerfile of coturn/coturn:alpine Docker image.
 #
 
-ARG alpine_ver=3.13
+ARG alpine_ver=3.14
 
 
 
@@ -39,7 +39,7 @@ RUN mkdir -p /build/ && cd /build/ \
 
 # Build libprom.so from sources.
 RUN mkdir -p /build/prom/build/ && cd /build/prom/build/ \
- && TEST=0 cmake -v -G "Unix Makefiles" \
+ && TEST=0 cmake -G "Unix Makefiles" \
                  -DCMAKE_INSTALL_PREFIX=/usr \
                  -DCMAKE_SKIP_BUILD_RPATH=TRUE \
                  -DCMAKE_C_FLAGS="-DPROM_LOG_ENABLE -g -O3" \
@@ -51,7 +51,7 @@ RUN mkdir -p /build/promhttp/build/ && cd /build/promhttp/build/ \
  # Fix compiler warning: -Werror=incompatible-pointer-types
  && sed -i 's/\&promhttp_handler/(MHD_AccessHandlerCallback)\&promhttp_handler/' \
            /build/promhttp/src/promhttp.c \
- && TEST=0 cmake -v -G "Unix Makefiles" \
+ && TEST=0 cmake -G "Unix Makefiles" \
                  -DCMAKE_INSTALL_PREFIX=/usr \
                  -DCMAKE_SKIP_BUILD_RPATH=TRUE \
                  -DCMAKE_C_FLAGS="-g -O3" \
diff --git a/docker/coturn/debian/Dockerfile b/docker/coturn/debian/Dockerfile
index f859957..20d2580 100644
--- a/docker/coturn/debian/Dockerfile
+++ b/docker/coturn/debian/Dockerfile
@@ -40,7 +40,7 @@ RUN mkdir -p /build/ && cd /build/ \
 
 # Build libprom.so from sources.
 RUN mkdir -p /build/prom/build/ && cd /build/prom/build/ \
- && TEST=0 cmake -v -G "Unix Makefiles" \
+ && TEST=0 cmake -G "Unix Makefiles" \
                  -DCMAKE_INSTALL_PREFIX=/usr \
                  -DCMAKE_SKIP_BUILD_RPATH=TRUE \
                  -DCMAKE_C_FLAGS="-DPROM_LOG_ENABLE -g -O3" \
@@ -52,7 +52,7 @@ RUN mkdir -p /build/promhttp/build/ && cd /build/promhttp/build/ \
  # Fix compiler warning: -Werror=incompatible-pointer-types
  && sed -i 's/\&promhttp_handler/(MHD_AccessHandlerCallback)\&promhttp_handler/' \
            /build/promhttp/src/promhttp.c \
- && TEST=0 cmake -v -G "Unix Makefiles" \
+ && TEST=0 cmake -G "Unix Makefiles" \
                  -DCMAKE_INSTALL_PREFIX=/usr \
                  -DCMAKE_SKIP_BUILD_RPATH=TRUE \
                  -DCMAKE_C_FLAGS="-g -O3" \