diff --git a/irssi/Dockerfile b/irssi/Dockerfile
index 21e4a8e..25a9a19 100644
--- a/irssi/Dockerfile
+++ b/irssi/Dockerfile
@@ -4,6 +4,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 		ca-certificates \
 		curl \
 		libdatetime-perl \
+		libgcrypt20-dev \
 		libglib2.0-0 \
 		libnotify4 \
 		libnotify-bin \
@@ -23,6 +24,8 @@ ENV LANG C.UTF-8
 RUN gpg --keyserver pool.sks-keyservers.net --recv-keys 7EE65E3082A5FB06AC7C368D00CCB587DDBEF0E1
 
 ENV IRSSI_VERSION 0.8.17
+ENV LIB_OTR_VERSION 4.1.0
+ENV IRSSI_OTR_VERSION 1.0.0
 
 RUN buildDeps=' \
 		autoconf \
@@ -49,12 +52,32 @@ RUN buildDeps=' \
 	&& cd /usr/src/irssi \
 	&& ./configure \
 		--enable-true-color \
+		--prefix="/usr" \
 		--with-bot \
 		--with-proxy \
 		--with-socks \
 	&& make \
 	&& make install \
-	&& rm -rf /usr/src/irssi \
+	&& curl -sSL "https://otr.cypherpunks.ca/libotr-${LIB_OTR_VERSION}.tar.gz" -o /tmp/libotr.tar.gz \
+	&& curl -sSL "https://otr.cypherpunks.ca/libotr-${LIB_OTR_VERSION}.tar.gz.asc" -o /tmp/libotr.tar.gz.asc \
+	&& curl -sSL "https://otr.cypherpunks.ca/gpgkey.asc" | gpg --import \
+	&& gpg --verify /tmp/libotr.tar.gz.asc \
+	&& mkdir -p /usr/src/libotr \
+	&& tar -xzf /tmp/libotr.tar.gz -C /usr/src/libotr --strip-components 1 \
+	&& rm /tmp/libotr.tar.gz* \
+	&& cd /usr/src/libotr \
+	&& ./configure --with-pic --prefix=/usr \
+	&& make \
+	&& make install \
+	&& mkdir -p /usr/src/irssi-otr \
+	&& curl -sSL "https://github.com/cryptodotis/irssi-otr/archive/v${IRSSI_OTR_VERSION}.tar.gz" | tar -vxz --strip-components 1 -C /usr/src/irssi-otr \
+	&& cd /usr/src/irssi-otr \
+	&& ./bootstrap \
+	&& ./configure --prefix="/usr" \
+	&& make \
+	&& make install \
+	&& rm -rf /usr/src/irssi* \
+	&& rm -rf /usr/src/libotr* \
 	&& apt-get purge -y --auto-remove $buildDeps
 
 WORKDIR $HOME