diff --git a/Dockerfile b/Dockerfile
index 0826833..f468fe7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
-FROM alpine:3.20 as builder
+FROM alpine:3.21 as builder
 
-ARG VERSION=1.5.634
+ARG VERSION=1.5.735
 
 LABEL \
     org.label-schema.vendor="Alexey Skobkin - skobkin@proton.me" \
@@ -31,21 +31,17 @@ RUN \
     protobuf-dev  \
     qt5-qtbase-dev
 
-COPY patches/implicit_bool_cast.patch /tmp/murmur/
-
 RUN \
     cd /tmp/murmur && \
     mkdir build && \
     cd build && \
-    # https://bugs.gentoo.org/863452 \
-    patch ../src/SSL.cpp < ../implicit_bool_cast.patch && \
     # static build is currently unavailable
     # see https://github.com/mumble-voip/mumble/issues/5693#issuecomment-1132069719
     # -Dstatic=ON
     cmake -Dclient=OFF -Ddbus=OFF -Dice=OFF -Dzeroconf=OFF -Dlto=ON .. && \
     make -j $(nproc)
 
-FROM alpine:3.20
+FROM alpine:3.21
 
 RUN \
     apk update -q --no-cache && \
diff --git a/patches/implicit_bool_cast.patch b/patches/implicit_bool_cast.patch
deleted file mode 100644
index ef20337..0000000
--- a/patches/implicit_bool_cast.patch
+++ /dev/null
@@ -1,14 +0,0 @@
-CRYPTO_get_locking_callback is defined as null in openssl
-so this is always true, but it fails to compile on musl 1.2.3
-as casting from null to bool is invalid
---- a/src/SSL.cpp
-+++ b/src/SSL.cpp
-@@ -33,7 +33,7 @@
- 	// If we detect that no locking callback is configured, we
- 	// have to set it up ourselves to allow multi-threaded use
- 	// of OpenSSL.
--	if (!CRYPTO_get_locking_callback()) {
-+	if (true) {
- 		SSLLocks::initialize();
- 	}
- }